Dr.Soney C George - Academia.edu (original) (raw)

Papers by Dr.Soney C George

Indian Journal of Engineering and Materials Sciences (IJEMS), Mar 2, 2021

The preparation and properties of latex modified concrete (LMC), nano silica modified concrete (n... more The preparation and properties of latex modified concrete (LMC), nano silica modified concrete (nSMC) and silicalatex modified concrete (SLMC) have been investigated in this study. Properties like compressive strength, tensile strength, flexural strength, thermal characteristics and water absorption have been evaluated. The 7-day compressive strength has increased 37% (30.15 N/mm 2) after the inclusion of nano silica and latex. The composite has showed considerable improvements in splitting tensile strength (3.24 N/mm 2), flexural strength (6.05 N/mm 2) and thermal conductivity, while it lowered the water absorption rate. The property increase has been attributed to the pore filling and pozzolanic activity of nano silica and densification of matrix by natural rubber latex and nano silica. The results of this study have suggested that the addition of nano silica and latex could be a relevant technique toward conventional concrete as a key material along with energy efficient construction and building technology.

Materials Horizons: From Nature to Nanomaterials, 2021

Polyethylene is being considered as a unique polymer in the whole plastic industry and it has num... more Polyethylene is being considered as a unique polymer in the whole plastic industry and it has numerous applications. Low-density polyethylene (LDPE) has tremendous electrical insulating properties, and therefore it has been using as a good insulator for the last 60 years. However, it has some demerits too. It always requires a low upper service temperature which makes it unsuitable for several applications like in hot water pipes. Several modifications have been done to improve the properties and the better strategy is the replacement of LDPE by cross-linked polyethylene (XLPE). XLPE has superior heat deformation characteristics [1]. Applications of cross-linked polyethylene include heat shrinkable products, chemical resistant seals, means for thermal insulation and food stuff packaging. It has a wide range to tolerate thermal shocks and electric loading. XLPE requires only a small thickness for insulation. These reasons make it as a suitable material for cable jacketing industry [2]. From 1994, various studies have been carried out on nanodielectrics. The interface zone generated by two different materials (nanomaterials and the polymer) will increase when the filler particles are in the nanometer scale. Nanotechnology provides an easy way to tune the properties of a composite by developing the

Fluoroelastomer/graphite nanoplatelet (FKM/GNP) nanocomposites were prepared by two-roll mixing. ... more Fluoroelastomer/graphite nanoplatelet (FKM/GNP) nanocomposites were prepared by two-roll mixing. The effect of graphite nanoplatelets on the mechanical and thermal properties of fluoroelastomer nanocomposites was studied as a function of filler loading. The dispersion and interaction of the filler in the polymer matrix was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. It was found that the nanocomposite with 8 phr of filler loading showed optimum properties with 400% enhancement in tensile properties and 140% increase in tear strength. The thermal stability is also enhanced for 8 phr filler loaded fluoelastomer nanocomposite and only 32% weight loss was observed at 475°C. Incorporation of GNP efficiently improved both the thermal and mechanical properties of the nanocomposites by its interaction with the polymer matrix.

Characterization of Nanomaterials, 2018

Abstract Designing and fabrication of materials with good thermal characteristics is very importa... more Abstract Designing and fabrication of materials with good thermal characteristics is very important for multifunctional applications of nanomaterials. Thermal analysis is a group of techniques that characterize the thermal properties of materials. With these techniques, changes in the temperature of the sample is analyzed. No single thermal analysis tool or technique works best in all situations. Accurate thermal assessments require a combination of different analytical techniques. This chapter presents the basic principles of thermal systems and describes some of the techniques and tools available to complete thermal characterization of nanomaterials.

Polymer Testing, 2020

Abstract The effect of exfoliated graphite (EG) on the mechanical, tribological and dielectric pr... more Abstract The effect of exfoliated graphite (EG) on the mechanical, tribological and dielectric properties of the silicone rubber (QM) composites has been systematically investigated and analysed. Morphological analysis of the composites helps to understand the interfacial interaction between the filler and the rubber matrix as well as wear mechanism respectively. An enhancement in the mechanical, tribological and dielectric properties was observed with an increase in filler loading and better performance was observed at 7 phr of filler loading. The improvement in performance is attributed to the better interaction between the QM chains and the EG layers as evident from the AFM and TEM analysis. It is also evident from the Kraus plot which supports the reinforcing effect of EG in QM matrix.

Polymer Testing, 2018

Flexible and conductive nanocomposites with enhanced mechanical and dielectric properties have be... more Flexible and conductive nanocomposites with enhanced mechanical and dielectric properties have been fabricated from reduced graphene oxide (RGO) reinforced polychloroprene rubber (CR). Composites were prepared on a two-roll mixing mill and the morphological analysis using SEM and TEM showed good dispersibility and exfoliation of RGO layers in the matrix. It imparted a critical role in the enhancement of mechanical and electrical properties of the composites. Composites with 0.9 phr of RGO showed an enhancement in tensile strength, tensile modulus and electrical conductivity as 92%, 75%, and 103 % respectively more than the pristine polychloroprene. RGO formed a good conducting percolating network in the polychloroprene matrix and it led to the formation of a dielectric composite material with enhanced electrical properties.

Polymer Testing, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Arabian Journal of Chemistry, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Trends in Green Chemistry, 2015

Activated carbon is an adsorbent in the separation and purification industries. The adsorption ca... more Activated carbon is an adsorbent in the separation and purification industries. The adsorption capacity of activated carbon depends on porosity and its surface chemistry. In this review the production of activation carbon from a large number of abundant and low-cost materials and agricultural waste such as Camellia oleifera shell, bamboo, cherry stones, waste tea, and Paulownia flower are discussed. Chemical or physical activation methods and microwave radiation methods are the commonly used techniques adopted for preparation of activated carbon.

International Journal of Membrane Science and Technology, 2015

Bentonite nanoclay reinforced Poly (vinyl alcohol) (PVA) nanocomposite membranes were used for th... more Bentonite nanoclay reinforced Poly (vinyl alcohol) (PVA) nanocomposite membranes were used for the separation of azeotropic composition of water-ethanol mixtures by pervaporation process. Fourier-transform infrared (FTIR) spectroscopic studies revealed the interaction of bentonite nanoclay and the PVA matrix. The dispersion and distribution of nanoclay in the polymer matrix was demonstrated by transmission electron microscopic analysis (TEM). The intrinsic membrane properties with filler loading were also investigated. The results indicate that the hydrophilic nature of the nanoclay influenced the pervaporation to a greater extent. The hydrophilic nature and surface roughness of the nanocomposite membranes was analyzed by atomic force microscopic (AFM) analysis. The pervaporation process illustrates that the permeation flux increases and the separation factor decreases with nanoclay loading. The instrinsic selectivity, which reflects the membrane performance was maximum for 1 wt% clay loaded membranes. PVA with 1 wt% nanoclay loading showed better pervaporation performance. The separation factor of the 1 wt% nanoclay membranes increased to 13, i.e. nearly 4 times more than that of neat PVA membranes. Membrane selectivity also increased to 254% than that of pristine PVA membranes. Thus at lower filler loading, maximum separation was achieved. The increase in nanoclay loading is favorable to improve intrinsic permeance at the cost of decrease in selectivity.

Transactions of the Indian Institute of Metals, 2015

Human hair is a non-biodegradable waste available in plenty throughout the world but is rarely ex... more Human hair is a non-biodegradable waste available in plenty throughout the world but is rarely explored for applications in engineering fields. Tensile strength of human hair ranges from 170 to 220 MPa (Xiao et al., Nano Tensile Study Single Hum Hair Fiber, 2006). This property of human hair can be made use in the field of making bio-composites. The composite is prepared by commixing the human hair and natural rubber in a two roll mill along with additives followed by vulcanization. Here the length of the human hair is varied by fine-tuning the fibre loading as 20 parts per hundred rubber and sundry tests like tensile, abrasion, tear and hardness were conducted. While incrementing the fibre length up to a certain range the mechanical properties shows superior amendments.

Journal of the Chemical Society, Chemical Communications, 1994

Synthesis and phototransformations of a polymer bearing two o-nitrobenzylic chromophores at symme... more Synthesis and phototransformations of a polymer bearing two o-nitrobenzylic chromophores at symmetrical positions per repeating unit to a polar photochromic azopolymer are described. Photochemistry of o-nitrobenzylic and related chromophores has various applications.*-9 We have exploited this photochemistry to help design and synthesise positive type photoresist polymers, such as the new photodegradable polyamide 1 (Scheme l).IO We have now synthesized a new dicarboxylic acid 5 , containing two o-nitrobenzylic groups at symmetrical positions, which contain potential degradation sites in every repeating unit and could be easily polymerised. However,

Boudenne/Handbook of Multiphase Polymer Systems, 2011

Page 1. 5 Manufacturing of Multiphase Polymeric Systems Soney C. George Department of Basic Scien... more Page 1. 5 Manufacturing of Multiphase Polymeric Systems Soney C. George Department of Basic Sciences, Amal Jyothi College of Engineering, Kerala, India Sabu Thomas Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kerala, India 5.1 Introduction ...

ChemInform, 2007

A simple and convenient method for the addition of TMSCN to carbonyl compounds is described. NbCl... more A simple and convenient method for the addition of TMSCN to carbonyl compounds is described. NbCls is found to possess a strong Lewis acid property to transform carbonyl compounds smoothly to the corresponding cyanosilylether in high yields (up to 99 %) in solventfree conditions.

Journal of Membrane and Separation Technology, 2014

Chloroprene rubber is a high performance elastomer with remarkable ageing, heat and oil resistanc... more Chloroprene rubber is a high performance elastomer with remarkable ageing, heat and oil resistance. A new class of elastomeric nanocomposite was prepared by incorporating reduced graphene oxide (RGO) into chloroprene rubber (CR). RGO is synthesised from natural graphite, through GO route via Hummer's method. This paper focuses on the influence of reduced graphene oxide on chloroprene rubber based elastomeric composites and their pervaporation separation of azeotropic liquid mixtures. The effect of concentration of RGO on separation factor, pervaporation separation index (PSI) and flux of the membranes were analysed. Chloroprene loaded with 0.9 phr (parts per hundred rubber) RGO shows an improved permeation rate among all other membranes while chloroform/acetone (80/20) azeotropic liquid mixture was used as feed solution. Flux increases with increasing the concentration of filler, reaches an optimum value and then decreases. Interestingly PSI also shows similar trend.

Progress in Polymer Science, 2001

New Journal of Chemistry, 2014

A facile and environmentally benign approach for the synthesis of highly transparent and fluoresc... more A facile and environmentally benign approach for the synthesis of highly transparent and fluorescent CdSe-CdS-ZnS core-multi-shell polymer nanocomposites is presented. The CdSe-CdS-ZnS coremulti-shell quantum dots (QDs) were prepared via a continual precursor injection and phosphine free method in paraffin liquid and oleic acid without a protective atmosphere. The as-prepared core-multishell QDs were dispersed directly in an epoxy polymer matrix via a melt mixing technique. The QDs showed better dispersibility and good optical properties in the epoxy matrix. The transmission electron microscopy (TEM) images showed that the as-synthesized QDs are small, spherical and are well dispersed inside the polymer matrix without any change in morphology. It was found that the nanocomposite filled with yellow-emitting QDs had more transparency compared to the neat epoxy. The luminescence of the neat polymer shifted from the blue region to the yellow region in the nanocomposite. The fluorescent lifetime analysis of the as-prepared core-multi shell and the polymer nanocomposite showed a decrease compared to the core while the tensile measurements showed an increase in the tensile properties of the nanocomposite in comparison with the neat polymer.

Journal of Membrane Science, 1999

... Fig. 6 shows the 13 C NMR spectra of uncrosslinked SBR and SBR crosslinked with high sulfur c... more ... Fig. 6 shows the 13 C NMR spectra of uncrosslinked SBR and SBR crosslinked with high sulfur content. Small peaks at 52 ppm present in Fig. ... This occurs when the rate ofdiffusion of penetrant is smaller than polymer segmental mobility. ...

Journal of Materials Science, 2013

The article describes the transport phenomenon of some commonly used laboratory organic solvents ... more The article describes the transport phenomenon of some commonly used laboratory organic solvents which differ in their solubility parameter value through polymer blend nanocomposites membrane prepared by melt mixing. The three solvents that were used are hexane, toluene and xylene which differed widely in their solubility parameter values. The motivation for the study was to know the effect of solubility parameter on the diffusion transport properties of NR/NBR (natural rubber/nitrile rubber) blends. The solvent uptake, diffusion, sorption and permeation constants were investigated and were found to decrease with organically modified montmorillonite (OMt) content at lower loading. The mode of transport through NR/NBR nanocomposites was found to be anomalous. The difference in solubility parameter value greatly influenced the transport properties. The dependence of various properties on OMt content was supported by morphological analysis data. The effect of blend ratio, solvent size and OMt loading on the diffusion of aromatic and aliphatic solvents through NR/ NBR blend systems were investigated. The swelling coefficient values also decreased upon the addition of fillers indicating the presence of hindered path for solvents to diffuse into the polymer matrix. The better reinforcement at lower filler loading was confirmed from the cross-link density values and mechanical properties. The transport data obtained were applied to mathematical models for predicting the diffusion behaviour through nanocomposite membranes and to elucidate the physical mechanism of transport.

Journal of Materials Science, 2010

Abstract An investigation was carried out to explore the morphology and mechanical properties of ... more Abstract An investigation was carried out to explore the morphology and mechanical properties of diglycidyl ether of bisphenol A epoxy resin (DGEBA) with liquid natural rubber possessing hydroxyl functionality (HLNR). Though modification of epoxies by synthetic rubber has ...

Indian Journal of Engineering and Materials Sciences (IJEMS), Mar 2, 2021

The preparation and properties of latex modified concrete (LMC), nano silica modified concrete (n... more The preparation and properties of latex modified concrete (LMC), nano silica modified concrete (nSMC) and silicalatex modified concrete (SLMC) have been investigated in this study. Properties like compressive strength, tensile strength, flexural strength, thermal characteristics and water absorption have been evaluated. The 7-day compressive strength has increased 37% (30.15 N/mm 2) after the inclusion of nano silica and latex. The composite has showed considerable improvements in splitting tensile strength (3.24 N/mm 2), flexural strength (6.05 N/mm 2) and thermal conductivity, while it lowered the water absorption rate. The property increase has been attributed to the pore filling and pozzolanic activity of nano silica and densification of matrix by natural rubber latex and nano silica. The results of this study have suggested that the addition of nano silica and latex could be a relevant technique toward conventional concrete as a key material along with energy efficient construction and building technology.

Materials Horizons: From Nature to Nanomaterials, 2021

Polyethylene is being considered as a unique polymer in the whole plastic industry and it has num... more Polyethylene is being considered as a unique polymer in the whole plastic industry and it has numerous applications. Low-density polyethylene (LDPE) has tremendous electrical insulating properties, and therefore it has been using as a good insulator for the last 60 years. However, it has some demerits too. It always requires a low upper service temperature which makes it unsuitable for several applications like in hot water pipes. Several modifications have been done to improve the properties and the better strategy is the replacement of LDPE by cross-linked polyethylene (XLPE). XLPE has superior heat deformation characteristics [1]. Applications of cross-linked polyethylene include heat shrinkable products, chemical resistant seals, means for thermal insulation and food stuff packaging. It has a wide range to tolerate thermal shocks and electric loading. XLPE requires only a small thickness for insulation. These reasons make it as a suitable material for cable jacketing industry [2]. From 1994, various studies have been carried out on nanodielectrics. The interface zone generated by two different materials (nanomaterials and the polymer) will increase when the filler particles are in the nanometer scale. Nanotechnology provides an easy way to tune the properties of a composite by developing the

Fluoroelastomer/graphite nanoplatelet (FKM/GNP) nanocomposites were prepared by two-roll mixing. ... more Fluoroelastomer/graphite nanoplatelet (FKM/GNP) nanocomposites were prepared by two-roll mixing. The effect of graphite nanoplatelets on the mechanical and thermal properties of fluoroelastomer nanocomposites was studied as a function of filler loading. The dispersion and interaction of the filler in the polymer matrix was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. It was found that the nanocomposite with 8 phr of filler loading showed optimum properties with 400% enhancement in tensile properties and 140% increase in tear strength. The thermal stability is also enhanced for 8 phr filler loaded fluoelastomer nanocomposite and only 32% weight loss was observed at 475°C. Incorporation of GNP efficiently improved both the thermal and mechanical properties of the nanocomposites by its interaction with the polymer matrix.

Characterization of Nanomaterials, 2018

Abstract Designing and fabrication of materials with good thermal characteristics is very importa... more Abstract Designing and fabrication of materials with good thermal characteristics is very important for multifunctional applications of nanomaterials. Thermal analysis is a group of techniques that characterize the thermal properties of materials. With these techniques, changes in the temperature of the sample is analyzed. No single thermal analysis tool or technique works best in all situations. Accurate thermal assessments require a combination of different analytical techniques. This chapter presents the basic principles of thermal systems and describes some of the techniques and tools available to complete thermal characterization of nanomaterials.

Polymer Testing, 2020

Abstract The effect of exfoliated graphite (EG) on the mechanical, tribological and dielectric pr... more Abstract The effect of exfoliated graphite (EG) on the mechanical, tribological and dielectric properties of the silicone rubber (QM) composites has been systematically investigated and analysed. Morphological analysis of the composites helps to understand the interfacial interaction between the filler and the rubber matrix as well as wear mechanism respectively. An enhancement in the mechanical, tribological and dielectric properties was observed with an increase in filler loading and better performance was observed at 7 phr of filler loading. The improvement in performance is attributed to the better interaction between the QM chains and the EG layers as evident from the AFM and TEM analysis. It is also evident from the Kraus plot which supports the reinforcing effect of EG in QM matrix.

Polymer Testing, 2018

Flexible and conductive nanocomposites with enhanced mechanical and dielectric properties have be... more Flexible and conductive nanocomposites with enhanced mechanical and dielectric properties have been fabricated from reduced graphene oxide (RGO) reinforced polychloroprene rubber (CR). Composites were prepared on a two-roll mixing mill and the morphological analysis using SEM and TEM showed good dispersibility and exfoliation of RGO layers in the matrix. It imparted a critical role in the enhancement of mechanical and electrical properties of the composites. Composites with 0.9 phr of RGO showed an enhancement in tensile strength, tensile modulus and electrical conductivity as 92%, 75%, and 103 % respectively more than the pristine polychloroprene. RGO formed a good conducting percolating network in the polychloroprene matrix and it led to the formation of a dielectric composite material with enhanced electrical properties.

Polymer Testing, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Arabian Journal of Chemistry, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Trends in Green Chemistry, 2015

Activated carbon is an adsorbent in the separation and purification industries. The adsorption ca... more Activated carbon is an adsorbent in the separation and purification industries. The adsorption capacity of activated carbon depends on porosity and its surface chemistry. In this review the production of activation carbon from a large number of abundant and low-cost materials and agricultural waste such as Camellia oleifera shell, bamboo, cherry stones, waste tea, and Paulownia flower are discussed. Chemical or physical activation methods and microwave radiation methods are the commonly used techniques adopted for preparation of activated carbon.

International Journal of Membrane Science and Technology, 2015

Bentonite nanoclay reinforced Poly (vinyl alcohol) (PVA) nanocomposite membranes were used for th... more Bentonite nanoclay reinforced Poly (vinyl alcohol) (PVA) nanocomposite membranes were used for the separation of azeotropic composition of water-ethanol mixtures by pervaporation process. Fourier-transform infrared (FTIR) spectroscopic studies revealed the interaction of bentonite nanoclay and the PVA matrix. The dispersion and distribution of nanoclay in the polymer matrix was demonstrated by transmission electron microscopic analysis (TEM). The intrinsic membrane properties with filler loading were also investigated. The results indicate that the hydrophilic nature of the nanoclay influenced the pervaporation to a greater extent. The hydrophilic nature and surface roughness of the nanocomposite membranes was analyzed by atomic force microscopic (AFM) analysis. The pervaporation process illustrates that the permeation flux increases and the separation factor decreases with nanoclay loading. The instrinsic selectivity, which reflects the membrane performance was maximum for 1 wt% clay loaded membranes. PVA with 1 wt% nanoclay loading showed better pervaporation performance. The separation factor of the 1 wt% nanoclay membranes increased to 13, i.e. nearly 4 times more than that of neat PVA membranes. Membrane selectivity also increased to 254% than that of pristine PVA membranes. Thus at lower filler loading, maximum separation was achieved. The increase in nanoclay loading is favorable to improve intrinsic permeance at the cost of decrease in selectivity.

Transactions of the Indian Institute of Metals, 2015

Human hair is a non-biodegradable waste available in plenty throughout the world but is rarely ex... more Human hair is a non-biodegradable waste available in plenty throughout the world but is rarely explored for applications in engineering fields. Tensile strength of human hair ranges from 170 to 220 MPa (Xiao et al., Nano Tensile Study Single Hum Hair Fiber, 2006). This property of human hair can be made use in the field of making bio-composites. The composite is prepared by commixing the human hair and natural rubber in a two roll mill along with additives followed by vulcanization. Here the length of the human hair is varied by fine-tuning the fibre loading as 20 parts per hundred rubber and sundry tests like tensile, abrasion, tear and hardness were conducted. While incrementing the fibre length up to a certain range the mechanical properties shows superior amendments.

Journal of the Chemical Society, Chemical Communications, 1994

Synthesis and phototransformations of a polymer bearing two o-nitrobenzylic chromophores at symme... more Synthesis and phototransformations of a polymer bearing two o-nitrobenzylic chromophores at symmetrical positions per repeating unit to a polar photochromic azopolymer are described. Photochemistry of o-nitrobenzylic and related chromophores has various applications.*-9 We have exploited this photochemistry to help design and synthesise positive type photoresist polymers, such as the new photodegradable polyamide 1 (Scheme l).IO We have now synthesized a new dicarboxylic acid 5 , containing two o-nitrobenzylic groups at symmetrical positions, which contain potential degradation sites in every repeating unit and could be easily polymerised. However,

Boudenne/Handbook of Multiphase Polymer Systems, 2011

Page 1. 5 Manufacturing of Multiphase Polymeric Systems Soney C. George Department of Basic Scien... more Page 1. 5 Manufacturing of Multiphase Polymeric Systems Soney C. George Department of Basic Sciences, Amal Jyothi College of Engineering, Kerala, India Sabu Thomas Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kerala, India 5.1 Introduction ...

ChemInform, 2007

A simple and convenient method for the addition of TMSCN to carbonyl compounds is described. NbCl... more A simple and convenient method for the addition of TMSCN to carbonyl compounds is described. NbCls is found to possess a strong Lewis acid property to transform carbonyl compounds smoothly to the corresponding cyanosilylether in high yields (up to 99 %) in solventfree conditions.

Journal of Membrane and Separation Technology, 2014

Chloroprene rubber is a high performance elastomer with remarkable ageing, heat and oil resistanc... more Chloroprene rubber is a high performance elastomer with remarkable ageing, heat and oil resistance. A new class of elastomeric nanocomposite was prepared by incorporating reduced graphene oxide (RGO) into chloroprene rubber (CR). RGO is synthesised from natural graphite, through GO route via Hummer's method. This paper focuses on the influence of reduced graphene oxide on chloroprene rubber based elastomeric composites and their pervaporation separation of azeotropic liquid mixtures. The effect of concentration of RGO on separation factor, pervaporation separation index (PSI) and flux of the membranes were analysed. Chloroprene loaded with 0.9 phr (parts per hundred rubber) RGO shows an improved permeation rate among all other membranes while chloroform/acetone (80/20) azeotropic liquid mixture was used as feed solution. Flux increases with increasing the concentration of filler, reaches an optimum value and then decreases. Interestingly PSI also shows similar trend.

Progress in Polymer Science, 2001

New Journal of Chemistry, 2014

A facile and environmentally benign approach for the synthesis of highly transparent and fluoresc... more A facile and environmentally benign approach for the synthesis of highly transparent and fluorescent CdSe-CdS-ZnS core-multi-shell polymer nanocomposites is presented. The CdSe-CdS-ZnS coremulti-shell quantum dots (QDs) were prepared via a continual precursor injection and phosphine free method in paraffin liquid and oleic acid without a protective atmosphere. The as-prepared core-multishell QDs were dispersed directly in an epoxy polymer matrix via a melt mixing technique. The QDs showed better dispersibility and good optical properties in the epoxy matrix. The transmission electron microscopy (TEM) images showed that the as-synthesized QDs are small, spherical and are well dispersed inside the polymer matrix without any change in morphology. It was found that the nanocomposite filled with yellow-emitting QDs had more transparency compared to the neat epoxy. The luminescence of the neat polymer shifted from the blue region to the yellow region in the nanocomposite. The fluorescent lifetime analysis of the as-prepared core-multi shell and the polymer nanocomposite showed a decrease compared to the core while the tensile measurements showed an increase in the tensile properties of the nanocomposite in comparison with the neat polymer.

Journal of Membrane Science, 1999

... Fig. 6 shows the 13 C NMR spectra of uncrosslinked SBR and SBR crosslinked with high sulfur c... more ... Fig. 6 shows the 13 C NMR spectra of uncrosslinked SBR and SBR crosslinked with high sulfur content. Small peaks at 52 ppm present in Fig. ... This occurs when the rate ofdiffusion of penetrant is smaller than polymer segmental mobility. ...

Journal of Materials Science, 2013

The article describes the transport phenomenon of some commonly used laboratory organic solvents ... more The article describes the transport phenomenon of some commonly used laboratory organic solvents which differ in their solubility parameter value through polymer blend nanocomposites membrane prepared by melt mixing. The three solvents that were used are hexane, toluene and xylene which differed widely in their solubility parameter values. The motivation for the study was to know the effect of solubility parameter on the diffusion transport properties of NR/NBR (natural rubber/nitrile rubber) blends. The solvent uptake, diffusion, sorption and permeation constants were investigated and were found to decrease with organically modified montmorillonite (OMt) content at lower loading. The mode of transport through NR/NBR nanocomposites was found to be anomalous. The difference in solubility parameter value greatly influenced the transport properties. The dependence of various properties on OMt content was supported by morphological analysis data. The effect of blend ratio, solvent size and OMt loading on the diffusion of aromatic and aliphatic solvents through NR/ NBR blend systems were investigated. The swelling coefficient values also decreased upon the addition of fillers indicating the presence of hindered path for solvents to diffuse into the polymer matrix. The better reinforcement at lower filler loading was confirmed from the cross-link density values and mechanical properties. The transport data obtained were applied to mathematical models for predicting the diffusion behaviour through nanocomposite membranes and to elucidate the physical mechanism of transport.

Journal of Materials Science, 2010

Abstract An investigation was carried out to explore the morphology and mechanical properties of ... more Abstract An investigation was carried out to explore the morphology and mechanical properties of diglycidyl ether of bisphenol A epoxy resin (DGEBA) with liquid natural rubber possessing hydroxyl functionality (HLNR). Though modification of epoxies by synthetic rubber has ...