kutlay sever | Izmir Katip Celebi (original) (raw)

Papers by kutlay sever

Polymer Composites, 2009

ABSTRACT The purpose of this article is to determine the structure of γ-glycidoxypropyltrimethoxy... more ABSTRACT The purpose of this article is to determine the structure of γ-glycidoxypropyltrimethoxysilane (γ-GPS) on glass fiber surfaces. The interfacial adhesion of glass fiber–polymer can be improved by the silane treatment of the glass fiber. To change the composition of the glass and regenerate to the hydroxyl groups, activation pretreatment of heat cleaned woven glass fabric was performed using a 10% (v/v) hydrochloric acid aqueous solution for different durations before silane treatment. The treatment of silanization of heat cleaned and acid activated glass fibers with (γ-GPS) were conducted at various time intervals. These fibers would be used to quantify the relationship between contact angle of glass fiber surface and the interfacial shear strength of the fiber–polymer interface. The effect of acid activation on glass surface and the interaction between glass fibers and silane coupling agent were examined using Fourier transform infrared spectroscopy. The experiments, in conjunction with electron photomicrographs of glass surfaces treated with coupling agent, are interpreted in an attempt to explain the stability of coupling agent-glass interfaces. From SEM analysis, it was clearly observed that agglomerations of silane agent in the cavities among the heat cleaned fibers are available. However, this case was not observed for the silanization of acid activated glass fibers. In addition, contact angle measurements on glass fibers were performed to evaluate surface structure. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers

Polymer Composites, 2009

ABSTRACT In this study, glass fibers were modified using γ-glycidoxypropyltrimethoxysilane of dif... more ABSTRACT In this study, glass fibers were modified using γ-glycidoxypropyltrimethoxysilane of different concentrations to improve the interfacial adhesion at interfaces between fibers and matrix. Effects of γ-glycidoxypropyltrimethoxysilane on mechanical properties and fracture behavior of glass fiber/epoxy composites were investigated experimentally. Mechanical properties of the composites have been investigated by tensile tests, short beam tests, and flexural tests. The short-beam method was used to measure the interlaminar shear strength (ILSS) of laminates. The tensile and flexural properties of composites were characterized by tensile and three-point bending tests, respectively. The fracture surfaces of the composites were observed with a scanning electron microscope. On comparing the results obtained for the different concentrations of silane solution, it was found that the 0.5% GPS silane treatment provided the best mechanical properties. The ILSS value of heat-cleaned glass fiber reinforced composite is enhanced by ∼59% as a result of the glass fiber treatment with 0.5% γ-GPS. Also, an improvement of about 37% in tensile strength, about 78% in flexural strength of the composite with the 0.5% γ-GPS treatment of glass fibers was observed. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers

Journal of Materials Science, 2008

In this study, effects of fiber surface treatments on mechanical behavior and fracture mechanism ... more In this study, effects of fiber surface treatments on mechanical behavior and fracture mechanism of glass fiber/epoxy composites were investigated experimentally. To change the composition of the glass and regenerate to the hydroxyl groups, activation pretreatment of heat cleaned woven glass fabric was performed using (v/v) HCl aqueous solution at different concentrations before silane treatment. The treatment of silanization of heat cleaned and acid activated glass fibers with c-glycidoxypropyltrimethoxysilane were performed. In this work, short beam shear test has been conducted to determine the performance of the acid treatment and the silane treatment in terms of the interlaminar shear strength. The silane coating on the heat cleaned glass fibers increased the interlaminar shear strength of the composite. However, the silane coating on the acid activated glass fibers did not improve the interlaminar shear strength of the composite. In addition, the strengths of the glass fabric specimens in tension and flexure were investigated. When the glass fibers are first treated with HCl solution and then with silane coupling agent, the tensile strengths of the composites decreased significantly. Scanning electron photomicrographs of fractured surfaces of composites were performed to explain the failure mechanisms in the composite laminates broken in tension.

Http Dx Doi Org 10 1080 00218464 2010 506160, Sep 1, 2010

This study intends to produce plasma polymer thin films of γ-glycidoxypropyltrimethoxysilane (γ-G... more This study intends to produce plasma polymer thin films of γ-glycidoxypropyltrimethoxysilane (γ-GPS) on glass fibers in order to improve interfacial adhesion of glass fiber-reinforced epoxy composites. A low frequency (LF) plasma generator was used for the plasma ...

Fibers and Polymers, 2012

In this study, the effect of incorporation of oligomeric siloxane into unsaturated polyester on m... more In this study, the effect of incorporation of oligomeric siloxane into unsaturated polyester on mechanical behavior of unidirectional glass fiber/polyester composites has been investigated by means of tensile, flexural and short beam shear tests. The amount of oligomeric siloxane added into unsaturated polyester was in the range 1–3 % by weight of the glass fabrics. Mechanical tests were conducted at different angles (0 °, 45 °, and 90 °) with respect to fiber direction. The higher siloxane content exhibited a tendency to have greater tensile, flexural and interlaminar shear strength values in machine direction, bias direction and cross direction. From Scanning electron microscopy images, the presence of polyester particles on the unidirectional glass fiber surface confirmed better adhesion.

Composites Part B: Engineering, 2013

High density polyethylene (HDPE) were filled with expanded graphite particles that have different... more High density polyethylene (HDPE) were filled with expanded graphite particles that have different particle sizes, 5-7 lm (EG5) and 40-55 lm (EG50) in diameter. Nanocomposites were prepared by the melt-mixing technique using EG5 and EG50 at different weight ratios. Transmission Electron Microscopy (TEM) was used to observe the morphology of the nanocomposites. X-ray diffraction patterns of EG5-HDPE and EG50-HDPE nanocomposites were investigated. Tensile tests were carried out to determine tensile strength, Young's modulus and elongation at break values. The storage modulus and loss modulus were evaluated by Dynamic Mechanical Analysis (DMA). The effect of EG5 and EG50 on electrical conductivity of HDPE was also determined. The tensile strength of HDPE increased 18.7% and 8.5% when 40 wt% EG5 and EG50 was added into HDPE, respectively. The storage modulus of EG5-HDPE and EG50-HDPE is higher compared to that of HDPE. Incorporation of EG5 and EG10 into HDPE also increased the relaxation transition peak of HDPE. The values of electrical conductivity for EG50-HDPE nanocomposites under the same filler content obtained higher in comparison with those for EG5-HDPE nanocomposites.

Composites Part B: Engineering, 2013

ABSTRACT In this study, flax fibers were treated by argon and air atmospheric pressure plasma sys... more ABSTRACT In this study, flax fibers were treated by argon and air atmospheric pressure plasma systems under various plasma powers to improve interfacial adhesion between the flax fiber and high density polyethylene (HDPE) and unsaturated polyester. The interfacial adhesion of argon treated flax fiber for HDPE matrix is superior than those of air treated and untreated flax fiber. However for the adhesion between flax fiber and polyester matrix, air treatment is more efficient than argon treatment. Besides, greater plasma power causes greater interfacial adhesion, which was proved by pull out tests. The surface characteristics of flax fibers were examined using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Scanning electron microscopy (SEM), and roughness tests. X-ray photoelectron spectroscopy analysis (XPS) indicated that the air plasma-treated fiber had higher oxygen concentration and higher oxygen/carbon ratio than the untreated fiber and argon plasma treated fiber. Changes in the surface chemical composition and functional groups, and increases in surface roughness were obtained. After both plasma treatments, it was clearly seen that a new functional group (OCO) generates on the flax fiber surface.

In this study, plasma polymerization technique was used to modify the surface of glass fiber unde... more In this study, plasma polymerization technique was used to modify the surface of glass fiber under various plasma powers (30, 60 and 90 W) for exposure time of 15 min to improve the compatibility between glass fiber and epoxy matrix. � -glycidoxypropyltrimethoxysilane ( �-GPS) monomer were used for surface coating of glass fiber. Interfacial properties of composites were investigated by

Proceedings of the …, 2009

... Yoldas SEKIa, Kutlay SEVERb, Mehmet SARIKANATc, Hacı Ali GÜLEÇd, Ismail Hakkı TAVMANe aDepart... more ... Yoldas SEKIa, Kutlay SEVERb, Mehmet SARIKANATc, Hacı Ali GÜLEÇd, Ismail Hakkı TAVMANe aDepartmant of Chemistry ... deu.edu.tr cDepartment of Mechanical Engineering, Ege University, Izmir, Turkey, mehmet.sarikanat@ege ... The jute fabric was supplied by Anıl Limited. ...

Composites Science and Technology, 2016

A novel chitosan-based electroactive actuator was fabricated by using chitosan, N, N 0-methyleneb... more A novel chitosan-based electroactive actuator was fabricated by using chitosan, N, N 0-methylenebisacrylamide (MBA), poly (diallyldimethylammonium chloride), and gold metal. The constructive effect of crosslinker to the actuator performance was investigated by using various amounts of MBA. The chitosan-based film samples were characterized using Fourier transform infrared analyses, X-ray diffraction analysis, thermogravimetric analysis, scanning electron microscopy analysis, and tensile test. The viscoelastic properties of films were determined by dynamic mechanical analysis. The motion and force generation capabilities and the repeatability of the actuators were also investigated under electrical stimuli up to 21 V. The suitability of the prepared chitosan-based films to be used as actuator for soft robotic applications is verified experimentally.

Composites Part B: Engineering, 2016

A detailed characterization of Graphene (Gr) loaded chitosan films were conducted in this study. ... more A detailed characterization of Graphene (Gr) loaded chitosan films were conducted in this study. Thermal characterization of Gr loaded CS films were made by using thermogravimetric analysis and thermal conductivity measurement. 1, 2, and 3 wt% loading of Gr into CS increased the thermal conductivity of CS by 25, 258 and 244%, respectively. The effect of Gr loading into CS on electrical resistivity properties of CS were determined by surface resistivity measurements. 1 wt% loading of Gr decreased the surface resistivity of CS film from 4.7x10 5 Ω/sq to 4.4x10 3 Ω/sq. Viscoeleastic properties of CS-Gr composite film samples were analyzed by using dyanmic mechanical analyis. Mechanical, morphological, crystallographic properties of composite films were determined by tensile tests, scanning electron microscopy (SEM) observations, and X-ray diffraction analyses, respectively. The storage modulus of CS was increased by 32% with 1wt% Gr loading into CS. With the loading of 1wt% of Gr, tensile strength and Young's modulus of CS film increased by 128%, and 52%, respectively. The hydrophilicity of the CS and CS-Gr composites films were examined by contact angle measurements.

J Compos Mater, 2010

In this study, jute/polyester composites were fabricated. To improve the adhesion between jute fa... more In this study, jute/polyester composites were fabricated. To improve the adhesion between jute fabric and polyester alkali-treated jute fabrics were treated with γ-methacryloxypropyltrimethoxysilane (γ-MPS). The effect of silane concentrations (0.1%, 0.3%, and 0.5%) on tensile properties, flexural properties, and interlaminar shear strength was investigated. Once jute fabrics were treated with 0.1% and 0.3% silane concentrations, the tensile properties of silane-treated

Science and Engineering of Composite Materials, 2017

In this study, multilayer graphene (Gr)-reinforced cellulose composites were synthesized by using... more In this study, multilayer graphene (Gr)-reinforced cellulose composites were synthesized by using 1-ethyl-3-methylimidazolium diethylphosphonate ionic liquid. The composites were fabricated via dissolving the cellulose in 1-ethyl-3-methylimidazolium diethylphosphonate and Gr loading at different ratios (0.2, 0.4, and 0.6 wt.%). Both sides of the composites were coated with gold leaf to generate electrodes. The effect of Gr loading on chemical functional groups, crystallographic properties, thermal stability, and morphological and mechanical properties of cellulose film was investigated by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and tensile test, respectively. Electromechanical behavior of the cellulose composite films reinforced with Gr (0.2, 0.4, and 0.6 wt.%) was investigated under DC excitation voltages of 1, 3, 5 and 7 V. Gr loading of 0.2 wt.% increased maximum tip displacement by 400% when the actuat...

Cellulose, 2015

In this article, the effects of graphene loading (0.1, 0.2, 0.3 wt%) on both the electromechanica... more In this article, the effects of graphene loading (0.1, 0.2, 0.3 wt%) on both the electromechanical and mechanical properties of carboxymethylcellulose (CMC)-based actuators were investigated. CMC-based graphene-loaded actuators were prepared by using 1-butyl-3-methylimidazolium bromide. The synthesized graphene-loaded actuators were characterized by Fourier transform infrared, X-ray diffraction analysis, thermogravimetric analysis, scanning electron microscopy, and tensile tests. Electromechanical properties of the actuators were obtained under DC excitation voltages of 1, 3, 5, and 7 V with a laser displacement sensor. According to the obtained results, the ultimate tensile strength of CMC-based actuators containing 0.3 wt% graphene was higher than that of unloaded actuators by approximately 72.8 %. In addition, the Young's modulus value of the graphene-loaded actuators increased continuously with increasing graphene content. Under a DC excitation voltage of 5 V, the maximum tip displacement of 0.2 wt% graphene-loaded actuators increased by about 15 % compared to unloaded actuators.

Cellulose, 2015

Electroactive behavior of carboxymethylcellulose (CMC)-based actuators was investigated in this s... more Electroactive behavior of carboxymethylcellulose (CMC)-based actuators was investigated in this study. CMC-based films were firstly fabricated by using 1-butyl-3-methylimidazolium bromide. Characterization studies of the CMC films were conducted by using Fourier transform infrared, X-ray diffraction analysis, thermogravimetric analysis, scanning electron microscopy, and tensile testing. CMC-based actuator films were produced by gold coating on both surfaces of CMC-based films. Polyethylene glycol (PEG) at different loadings (1, 1.5 and 2 g) was used to improve electroactive behavior of CMC based actuators. Maximum tip displacements were obtained under DC excitation voltages of 1, 3, 5 and 7 V. CMC based actuator loaded with 1.5 g PEG exhibited the largest tip displacement among other actuators for each excitation voltage. The PEG loading did not lead to considerable differences in tensile strength of CMC-based films. However, Young's modulus decreased with PEG loading.

Journal of Industrial Textiles, 2014

The aim of this study is to characterize linden fibres as a novel cellulose-based fibre to be use... more The aim of this study is to characterize linden fibres as a novel cellulose-based fibre to be used as a reinforcement material in composites and to investigate the adhesion property to unsaturated polyester. Up to now, there is no report regarding the potential usability of linden fibre in composite applications. Linden fibres were extracted from the stem of a plant of Tilia rubra DC. subsp. caucasica (Rupr.) V.Engl. Characterization of linden fibres was studied by Fourier transform infrared, X-ray photoelectron spectroscopy, thermogravimetric analysis, X-ray diffraction analysis, tensile and pull-out tests. Morphological properties of the fibres were observed through scanning electron and optical microscopes. Initial degradation temperature of the linden fibre was reported to be 238℃. The tensile strength and the Young’s modulus of the linden fibres were calculated to be 675.4 ± 45.7 MPa and 61.0 ± 9.8 GPa, respectively. The interfacial shear strength of the linden fibre with unsat...

Composites Part B: Engineering, 2015

In this study, graphene nanoplatelets (0.10, 0.25, and 0.50 wt.%) were loaded into cellulose matr... more In this study, graphene nanoplatelets (0.10, 0.25, and 0.50 wt.%) were loaded into cellulose matrix to improve electroactive performance of cellulose-based composite actuators. Firstly, cellulosic films were produced by dissolving microcrystalline cellulose in 1-butyl-3-methylimidazolium chloride. Afterwards, graphene loaded cellulosic films were fabricated and gold leaf was coated on both surfaces of graphene loaded cellulose-based films. The changes in crystallographic properties and chemical functional groups of cellulose were investigated by X-ray diffraction and Fourier transform infrared analyses, respectively. Besides, thermal stability, electrical conductivity, and morphological properties of the films were examined by thermogravimetric analysis, electrical conductivity measurement, and scanning electron microscopy, respectively. The tensile strength and the Young's modulus of the films and actuators were also determined by tensile tests. The electroactive characteristics were analyzed under DC excitation voltages of 3 V, 5 V and 7 V. The time responses were evaluated via proposed experimental data based model. The performances of the actuators were compared in terms of maximum tip displacement, minimum tip displacement and time constant.

Polymer Composites, 2009

ABSTRACT The purpose of this article is to determine the structure of γ-glycidoxypropyltrimethoxy... more ABSTRACT The purpose of this article is to determine the structure of γ-glycidoxypropyltrimethoxysilane (γ-GPS) on glass fiber surfaces. The interfacial adhesion of glass fiber–polymer can be improved by the silane treatment of the glass fiber. To change the composition of the glass and regenerate to the hydroxyl groups, activation pretreatment of heat cleaned woven glass fabric was performed using a 10% (v/v) hydrochloric acid aqueous solution for different durations before silane treatment. The treatment of silanization of heat cleaned and acid activated glass fibers with (γ-GPS) were conducted at various time intervals. These fibers would be used to quantify the relationship between contact angle of glass fiber surface and the interfacial shear strength of the fiber–polymer interface. The effect of acid activation on glass surface and the interaction between glass fibers and silane coupling agent were examined using Fourier transform infrared spectroscopy. The experiments, in conjunction with electron photomicrographs of glass surfaces treated with coupling agent, are interpreted in an attempt to explain the stability of coupling agent-glass interfaces. From SEM analysis, it was clearly observed that agglomerations of silane agent in the cavities among the heat cleaned fibers are available. However, this case was not observed for the silanization of acid activated glass fibers. In addition, contact angle measurements on glass fibers were performed to evaluate surface structure. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers

Polymer Composites, 2009

ABSTRACT In this study, glass fibers were modified using γ-glycidoxypropyltrimethoxysilane of dif... more ABSTRACT In this study, glass fibers were modified using γ-glycidoxypropyltrimethoxysilane of different concentrations to improve the interfacial adhesion at interfaces between fibers and matrix. Effects of γ-glycidoxypropyltrimethoxysilane on mechanical properties and fracture behavior of glass fiber/epoxy composites were investigated experimentally. Mechanical properties of the composites have been investigated by tensile tests, short beam tests, and flexural tests. The short-beam method was used to measure the interlaminar shear strength (ILSS) of laminates. The tensile and flexural properties of composites were characterized by tensile and three-point bending tests, respectively. The fracture surfaces of the composites were observed with a scanning electron microscope. On comparing the results obtained for the different concentrations of silane solution, it was found that the 0.5% GPS silane treatment provided the best mechanical properties. The ILSS value of heat-cleaned glass fiber reinforced composite is enhanced by ∼59% as a result of the glass fiber treatment with 0.5% γ-GPS. Also, an improvement of about 37% in tensile strength, about 78% in flexural strength of the composite with the 0.5% γ-GPS treatment of glass fibers was observed. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers

Journal of Materials Science, 2008

In this study, effects of fiber surface treatments on mechanical behavior and fracture mechanism ... more In this study, effects of fiber surface treatments on mechanical behavior and fracture mechanism of glass fiber/epoxy composites were investigated experimentally. To change the composition of the glass and regenerate to the hydroxyl groups, activation pretreatment of heat cleaned woven glass fabric was performed using (v/v) HCl aqueous solution at different concentrations before silane treatment. The treatment of silanization of heat cleaned and acid activated glass fibers with c-glycidoxypropyltrimethoxysilane were performed. In this work, short beam shear test has been conducted to determine the performance of the acid treatment and the silane treatment in terms of the interlaminar shear strength. The silane coating on the heat cleaned glass fibers increased the interlaminar shear strength of the composite. However, the silane coating on the acid activated glass fibers did not improve the interlaminar shear strength of the composite. In addition, the strengths of the glass fabric specimens in tension and flexure were investigated. When the glass fibers are first treated with HCl solution and then with silane coupling agent, the tensile strengths of the composites decreased significantly. Scanning electron photomicrographs of fractured surfaces of composites were performed to explain the failure mechanisms in the composite laminates broken in tension.

Http Dx Doi Org 10 1080 00218464 2010 506160, Sep 1, 2010

This study intends to produce plasma polymer thin films of γ-glycidoxypropyltrimethoxysilane (γ-G... more This study intends to produce plasma polymer thin films of γ-glycidoxypropyltrimethoxysilane (γ-GPS) on glass fibers in order to improve interfacial adhesion of glass fiber-reinforced epoxy composites. A low frequency (LF) plasma generator was used for the plasma ...

Fibers and Polymers, 2012

In this study, the effect of incorporation of oligomeric siloxane into unsaturated polyester on m... more In this study, the effect of incorporation of oligomeric siloxane into unsaturated polyester on mechanical behavior of unidirectional glass fiber/polyester composites has been investigated by means of tensile, flexural and short beam shear tests. The amount of oligomeric siloxane added into unsaturated polyester was in the range 1–3 % by weight of the glass fabrics. Mechanical tests were conducted at different angles (0 °, 45 °, and 90 °) with respect to fiber direction. The higher siloxane content exhibited a tendency to have greater tensile, flexural and interlaminar shear strength values in machine direction, bias direction and cross direction. From Scanning electron microscopy images, the presence of polyester particles on the unidirectional glass fiber surface confirmed better adhesion.

Composites Part B: Engineering, 2013

High density polyethylene (HDPE) were filled with expanded graphite particles that have different... more High density polyethylene (HDPE) were filled with expanded graphite particles that have different particle sizes, 5-7 lm (EG5) and 40-55 lm (EG50) in diameter. Nanocomposites were prepared by the melt-mixing technique using EG5 and EG50 at different weight ratios. Transmission Electron Microscopy (TEM) was used to observe the morphology of the nanocomposites. X-ray diffraction patterns of EG5-HDPE and EG50-HDPE nanocomposites were investigated. Tensile tests were carried out to determine tensile strength, Young's modulus and elongation at break values. The storage modulus and loss modulus were evaluated by Dynamic Mechanical Analysis (DMA). The effect of EG5 and EG50 on electrical conductivity of HDPE was also determined. The tensile strength of HDPE increased 18.7% and 8.5% when 40 wt% EG5 and EG50 was added into HDPE, respectively. The storage modulus of EG5-HDPE and EG50-HDPE is higher compared to that of HDPE. Incorporation of EG5 and EG10 into HDPE also increased the relaxation transition peak of HDPE. The values of electrical conductivity for EG50-HDPE nanocomposites under the same filler content obtained higher in comparison with those for EG5-HDPE nanocomposites.

Composites Part B: Engineering, 2013

ABSTRACT In this study, flax fibers were treated by argon and air atmospheric pressure plasma sys... more ABSTRACT In this study, flax fibers were treated by argon and air atmospheric pressure plasma systems under various plasma powers to improve interfacial adhesion between the flax fiber and high density polyethylene (HDPE) and unsaturated polyester. The interfacial adhesion of argon treated flax fiber for HDPE matrix is superior than those of air treated and untreated flax fiber. However for the adhesion between flax fiber and polyester matrix, air treatment is more efficient than argon treatment. Besides, greater plasma power causes greater interfacial adhesion, which was proved by pull out tests. The surface characteristics of flax fibers were examined using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Scanning electron microscopy (SEM), and roughness tests. X-ray photoelectron spectroscopy analysis (XPS) indicated that the air plasma-treated fiber had higher oxygen concentration and higher oxygen/carbon ratio than the untreated fiber and argon plasma treated fiber. Changes in the surface chemical composition and functional groups, and increases in surface roughness were obtained. After both plasma treatments, it was clearly seen that a new functional group (OCO) generates on the flax fiber surface.

In this study, plasma polymerization technique was used to modify the surface of glass fiber unde... more In this study, plasma polymerization technique was used to modify the surface of glass fiber under various plasma powers (30, 60 and 90 W) for exposure time of 15 min to improve the compatibility between glass fiber and epoxy matrix. � -glycidoxypropyltrimethoxysilane ( �-GPS) monomer were used for surface coating of glass fiber. Interfacial properties of composites were investigated by

Proceedings of the …, 2009

... Yoldas SEKIa, Kutlay SEVERb, Mehmet SARIKANATc, Hacı Ali GÜLEÇd, Ismail Hakkı TAVMANe aDepart... more ... Yoldas SEKIa, Kutlay SEVERb, Mehmet SARIKANATc, Hacı Ali GÜLEÇd, Ismail Hakkı TAVMANe aDepartmant of Chemistry ... deu.edu.tr cDepartment of Mechanical Engineering, Ege University, Izmir, Turkey, mehmet.sarikanat@ege ... The jute fabric was supplied by Anıl Limited. ...

Composites Science and Technology, 2016

A novel chitosan-based electroactive actuator was fabricated by using chitosan, N, N 0-methyleneb... more A novel chitosan-based electroactive actuator was fabricated by using chitosan, N, N 0-methylenebisacrylamide (MBA), poly (diallyldimethylammonium chloride), and gold metal. The constructive effect of crosslinker to the actuator performance was investigated by using various amounts of MBA. The chitosan-based film samples were characterized using Fourier transform infrared analyses, X-ray diffraction analysis, thermogravimetric analysis, scanning electron microscopy analysis, and tensile test. The viscoelastic properties of films were determined by dynamic mechanical analysis. The motion and force generation capabilities and the repeatability of the actuators were also investigated under electrical stimuli up to 21 V. The suitability of the prepared chitosan-based films to be used as actuator for soft robotic applications is verified experimentally.

Composites Part B: Engineering, 2016

A detailed characterization of Graphene (Gr) loaded chitosan films were conducted in this study. ... more A detailed characterization of Graphene (Gr) loaded chitosan films were conducted in this study. Thermal characterization of Gr loaded CS films were made by using thermogravimetric analysis and thermal conductivity measurement. 1, 2, and 3 wt% loading of Gr into CS increased the thermal conductivity of CS by 25, 258 and 244%, respectively. The effect of Gr loading into CS on electrical resistivity properties of CS were determined by surface resistivity measurements. 1 wt% loading of Gr decreased the surface resistivity of CS film from 4.7x10 5 Ω/sq to 4.4x10 3 Ω/sq. Viscoeleastic properties of CS-Gr composite film samples were analyzed by using dyanmic mechanical analyis. Mechanical, morphological, crystallographic properties of composite films were determined by tensile tests, scanning electron microscopy (SEM) observations, and X-ray diffraction analyses, respectively. The storage modulus of CS was increased by 32% with 1wt% Gr loading into CS. With the loading of 1wt% of Gr, tensile strength and Young's modulus of CS film increased by 128%, and 52%, respectively. The hydrophilicity of the CS and CS-Gr composites films were examined by contact angle measurements.

J Compos Mater, 2010

In this study, jute/polyester composites were fabricated. To improve the adhesion between jute fa... more In this study, jute/polyester composites were fabricated. To improve the adhesion between jute fabric and polyester alkali-treated jute fabrics were treated with γ-methacryloxypropyltrimethoxysilane (γ-MPS). The effect of silane concentrations (0.1%, 0.3%, and 0.5%) on tensile properties, flexural properties, and interlaminar shear strength was investigated. Once jute fabrics were treated with 0.1% and 0.3% silane concentrations, the tensile properties of silane-treated

Science and Engineering of Composite Materials, 2017

In this study, multilayer graphene (Gr)-reinforced cellulose composites were synthesized by using... more In this study, multilayer graphene (Gr)-reinforced cellulose composites were synthesized by using 1-ethyl-3-methylimidazolium diethylphosphonate ionic liquid. The composites were fabricated via dissolving the cellulose in 1-ethyl-3-methylimidazolium diethylphosphonate and Gr loading at different ratios (0.2, 0.4, and 0.6 wt.%). Both sides of the composites were coated with gold leaf to generate electrodes. The effect of Gr loading on chemical functional groups, crystallographic properties, thermal stability, and morphological and mechanical properties of cellulose film was investigated by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and tensile test, respectively. Electromechanical behavior of the cellulose composite films reinforced with Gr (0.2, 0.4, and 0.6 wt.%) was investigated under DC excitation voltages of 1, 3, 5 and 7 V. Gr loading of 0.2 wt.% increased maximum tip displacement by 400% when the actuat...

Cellulose, 2015

In this article, the effects of graphene loading (0.1, 0.2, 0.3 wt%) on both the electromechanica... more In this article, the effects of graphene loading (0.1, 0.2, 0.3 wt%) on both the electromechanical and mechanical properties of carboxymethylcellulose (CMC)-based actuators were investigated. CMC-based graphene-loaded actuators were prepared by using 1-butyl-3-methylimidazolium bromide. The synthesized graphene-loaded actuators were characterized by Fourier transform infrared, X-ray diffraction analysis, thermogravimetric analysis, scanning electron microscopy, and tensile tests. Electromechanical properties of the actuators were obtained under DC excitation voltages of 1, 3, 5, and 7 V with a laser displacement sensor. According to the obtained results, the ultimate tensile strength of CMC-based actuators containing 0.3 wt% graphene was higher than that of unloaded actuators by approximately 72.8 %. In addition, the Young's modulus value of the graphene-loaded actuators increased continuously with increasing graphene content. Under a DC excitation voltage of 5 V, the maximum tip displacement of 0.2 wt% graphene-loaded actuators increased by about 15 % compared to unloaded actuators.

Cellulose, 2015

Electroactive behavior of carboxymethylcellulose (CMC)-based actuators was investigated in this s... more Electroactive behavior of carboxymethylcellulose (CMC)-based actuators was investigated in this study. CMC-based films were firstly fabricated by using 1-butyl-3-methylimidazolium bromide. Characterization studies of the CMC films were conducted by using Fourier transform infrared, X-ray diffraction analysis, thermogravimetric analysis, scanning electron microscopy, and tensile testing. CMC-based actuator films were produced by gold coating on both surfaces of CMC-based films. Polyethylene glycol (PEG) at different loadings (1, 1.5 and 2 g) was used to improve electroactive behavior of CMC based actuators. Maximum tip displacements were obtained under DC excitation voltages of 1, 3, 5 and 7 V. CMC based actuator loaded with 1.5 g PEG exhibited the largest tip displacement among other actuators for each excitation voltage. The PEG loading did not lead to considerable differences in tensile strength of CMC-based films. However, Young's modulus decreased with PEG loading.

Journal of Industrial Textiles, 2014

The aim of this study is to characterize linden fibres as a novel cellulose-based fibre to be use... more The aim of this study is to characterize linden fibres as a novel cellulose-based fibre to be used as a reinforcement material in composites and to investigate the adhesion property to unsaturated polyester. Up to now, there is no report regarding the potential usability of linden fibre in composite applications. Linden fibres were extracted from the stem of a plant of Tilia rubra DC. subsp. caucasica (Rupr.) V.Engl. Characterization of linden fibres was studied by Fourier transform infrared, X-ray photoelectron spectroscopy, thermogravimetric analysis, X-ray diffraction analysis, tensile and pull-out tests. Morphological properties of the fibres were observed through scanning electron and optical microscopes. Initial degradation temperature of the linden fibre was reported to be 238℃. The tensile strength and the Young’s modulus of the linden fibres were calculated to be 675.4 ± 45.7 MPa and 61.0 ± 9.8 GPa, respectively. The interfacial shear strength of the linden fibre with unsat...

Composites Part B: Engineering, 2015

In this study, graphene nanoplatelets (0.10, 0.25, and 0.50 wt.%) were loaded into cellulose matr... more In this study, graphene nanoplatelets (0.10, 0.25, and 0.50 wt.%) were loaded into cellulose matrix to improve electroactive performance of cellulose-based composite actuators. Firstly, cellulosic films were produced by dissolving microcrystalline cellulose in 1-butyl-3-methylimidazolium chloride. Afterwards, graphene loaded cellulosic films were fabricated and gold leaf was coated on both surfaces of graphene loaded cellulose-based films. The changes in crystallographic properties and chemical functional groups of cellulose were investigated by X-ray diffraction and Fourier transform infrared analyses, respectively. Besides, thermal stability, electrical conductivity, and morphological properties of the films were examined by thermogravimetric analysis, electrical conductivity measurement, and scanning electron microscopy, respectively. The tensile strength and the Young's modulus of the films and actuators were also determined by tensile tests. The electroactive characteristics were analyzed under DC excitation voltages of 3 V, 5 V and 7 V. The time responses were evaluated via proposed experimental data based model. The performances of the actuators were compared in terms of maximum tip displacement, minimum tip displacement and time constant.