Hathaikarn Manuspiya | Chulalongkorn University (original) (raw)
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Papers by Hathaikarn Manuspiya
Polymer Bulletin, 2017
Porous Clay Heterostructures (PCHs) were prepared by the surfactant-directed assembly of silica s... more Porous Clay Heterostructures (PCHs) were prepared by the surfactant-directed assembly of silica source (tetraethylorthosilicate–TEOS) and sodium–bentonite (Na-BTN) clay. These PCHs were subsequently modified to an organic–inorganic hybrid material by the co-condensation reaction of TEOS with (3-mercaptopropyl trimethoxy silane (MPTMS) in 1:1, 2:1, and 4:1 molar ratios of MPTMS to TEOS to obtain conductive porous clays, here referred to as modified MPPCHs. Various weight percentage of MPPCHs at 1, 3, and 5 wt% were blended with polypropylene (PP) and fabricated into the PP/modified MPPCHs nanocomposite films. Analysis revealed that the surface areas of modified MPPCHs increased significantly from Na–BTN; however, the higher MPTMS contents resulted in less porous surface areas. An ethylene adsorption study showed that modified MPPCHs exhibited higher adsorption efficiency of ethylene gas than that of Na–BTN due to the non-polar property of the modified functional groups. Subsequently, the electrical conductivity of the modified MPPCHs with various contents of thiol group was investigated to evaluate potential use in ethylene scavenger/sensor applications.
Porous Clay Heterostructure (PCH) is an interesting material to use as entrapping system such as ... more Porous Clay Heterostructure (PCH) is an interesting material to use as entrapping system such as ethylene scavenger, respected to its high surface area with uniform and specific pore size. PCHs have been prepared by the surfactant-directed assembly of mesostructured silica within the two-dimensional galleries of clays. Then, the PCH was synthesized within the galleries of Na-bentonite clay by the polymerization of tetraethoxysilane (TEOS) in the presence of surfactant micelles. In addition, mesoporous clay with organic-inorganic hybrid (HPCH) is modified via co-condensation reaction of TEOS with candidate conductive functional groups (thiol group) and metal loading (silver), designated as MPPCH and Ag-PCH, to enhance surface conductivity of PCH material for using as sensor packaging. Subsequently, all modified PCHs were utilized as ethylene scavenger and blended with polypropylene for producing ethylene scavenging films in food packaging application with various ratios of clay. The morphological, structural, thermal, and mechanical properties were studied and reported in this work. In addition, the modified PCHs and polypropylene/modified PCHs nanocomposite films were also evaluated the potential uses in active packaging and sensor packaging.
Ferroelectrics, 2021
The concept of making composite has been conducted to improve the polarization of polyurethane (P... more The concept of making composite has been conducted to improve the polarization of polyurethane (PU) based polycarbonate diol. Barium strontium titanate (BST), lead-free ceramic with high dielectric and piezoelectric coefficient, was synthesized. To improve the compatibility of BST in PU composites, hydrogen peroxide and 3-aminopropyl trimethoxysilane were used to modify the BST surface. The organic-inorganic composite was synthesized using a prepolymer method by varying types of filler. BST create the physical interaction with PU while modified BST create the chemical interaction with PU in composites. The highest dielectric constant was found in the organic-inorganic composite with surface modified BST.
Novel nanocomposites based on poly(vinylidene difluoride) (PVDF) and modified porous clay were pr... more Novel nanocomposites based on poly(vinylidene difluoride) (PVDF) and modified porous clay were prepared. Bentonite clay was used as starting clay and synthesized as a porous clay heterosturcture (PCH). In addition, the PCH was modified by introduced barium ions into the PCH before blended with PVDF via melt method and then fabricated as a thin film nanocomposite. The optimal ratio between barium ions and PCH was studied and the successful inducement of barium ions into the PCH was confirmed by X-ray fluorescence spectroscopy technique. Moreover, the optimal ratio between modified clay and PVDF was evaluated. Finally, the dielectric behavior of the PVDF-modified clay nanocomposite were investigated and measured as functions of temperature and frequency by using impedance/gain phase analyzer. The results showed that the dielectric constant of the nanocomposite was increased with the amount of modified clay at all frequency and also higher than pure PVDF film.
Carbohydrate Polymers, 2011
ABSTRACT Carbohydrate Polymers j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / ... more ABSTRACT Carbohydrate Polymers j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / c a r b p o l a b s t r a c t Si–O thin film was successfully deposited on bacterial cellulose nanocomposite via plasma enhanced chemical vapor deposition (PECVD) as transparent barrier against water vapor. X-ray photoelectron spec-troscopy (XPS) confirmed consistent Si and O atomic concentrations through the entire depth of the Si–O layer. The Si–O layer had uniform and highly smooth surface – more than 80% of the surface features the surface roughness of 15 nm. The water vapor transmission rate (WVTR) of the bacterial cellulose nanocomposite was evaluated as 9 × 10 −2 g/m 2 /day, but after the deposition of the Si–O barrier layer, the WVTR in the range of 10 −4 g/m 2 /day was achieved. The WVTR property of the nanocomposite can be further adjusted through the operating parameters of PECVD. These properties indicated the quality of the Si–O film as an effective water vapor barrier. Bacterial cellulose nanocomposite deposited with Si–O barrier film can be useful as substrate for flexible organic light emitting diode (OLED) displays.
Industrial Crops and Products, 2012
International Journal of Adhesion and Adhesives
Journal of Materials Science: Materials in Electronics
Materials Today Communications
Journal of Porous Materials
Materials Today: Proceedings
Advanced Materials Research, 2008
Porous Clay Heterostructures (PCHs) have been prepared by the surfactant-directed assembly of mes... more Porous Clay Heterostructures (PCHs) have been prepared by the surfactant-directed assembly of mesostructured silica within the two-dimensional interlayer galleries of clays. The PCH is an interesting material to use as entrapping system such as ethylene scavenger, owing to its high surface area with uniform and specific pore size. In the present work, the PCH was synthesized within the galleries of Na-bentonite clay by the polymerization of tetraethoxysilane (TEOS) in the presence of surfactant micelles. In addition, a mesoporous clay with organic-inorganic hybrid (HPCH) is modified via co-condensation reaction of TEOS with methyltriethoxysilane (MTS) to enhance hydrophobicity of PCH material for entrapping system. According to pore characterization, PCHs have surface areas of 421-551 m2/g, an average pore diameter in the supermicropore to small mesopore range of 4.79-5.02 nm, and a pore volume of 0.57-0.66 cc/g while HPCHs have surface areas of 533-966 m2/g, an average pore diamete...
Polymer Chemistry
The addition of a fluorinated chain improved the polarization in polyurethane, shifted the relaxa... more The addition of a fluorinated chain improved the polarization in polyurethane, shifted the relaxation peaks, and changed the hysteresis loop behavior from a ferroelectric to a paraelectric phase.
Journal of Materials Science: Materials in Electronics
Journal of Polymers and the Environment
Polyol was successfully synthesized from natural palm olein and was used as a starting material f... more Polyol was successfully synthesized from natural palm olein and was used as a starting material for polyurethane foam synthesis. FT-IR spectroscopy was used to confirm of each reaction in the multistep synthesis, including the transesterification, epoxidation, and reaction with ethylene glycol, ultimately producing palm olein-based polyol (POBP) and POBP-containing polyurethane foam. The morphological properties of the prepared foams were investigated by scanning electron microscopy. The foam cells were uniform in size and shape, and a coarse cell structure was observed. While the pristine polyurethane foam contained closed cells, the pore structure became more interconnected with the introduction of POBP. The thermal properties were studied by DSC and TGA. In the presence of POBP, the sample was found to be less thermally stable. Mechanical testing revealed that the tensile strength and Young’s modulus were decreased, while the elongation at break was increased, suggesting that POBP improved the flexibility of the polyurethane foam. This was in agreement with the observed microstructure. Introducing POBP into the polyurethane foam also decreased the water contact angle from 120° to 80°. However, the oil sorption properties were improved due to interconnected pores along the polyurethane foam structure. Its sorption properties for synthetic dyes (methyl orange and rhodamine B) were also evaluated, and superior sorption properties were found for methyl orange. In short, the polyurethane synthesized from POBP exhibited attractive properties as a sorbent material.
Fascinating Fluoropolymers and Their Applications
Journal of Applied Polymer Science
Polymer Bulletin, 2017
Porous Clay Heterostructures (PCHs) were prepared by the surfactant-directed assembly of silica s... more Porous Clay Heterostructures (PCHs) were prepared by the surfactant-directed assembly of silica source (tetraethylorthosilicate–TEOS) and sodium–bentonite (Na-BTN) clay. These PCHs were subsequently modified to an organic–inorganic hybrid material by the co-condensation reaction of TEOS with (3-mercaptopropyl trimethoxy silane (MPTMS) in 1:1, 2:1, and 4:1 molar ratios of MPTMS to TEOS to obtain conductive porous clays, here referred to as modified MPPCHs. Various weight percentage of MPPCHs at 1, 3, and 5 wt% were blended with polypropylene (PP) and fabricated into the PP/modified MPPCHs nanocomposite films. Analysis revealed that the surface areas of modified MPPCHs increased significantly from Na–BTN; however, the higher MPTMS contents resulted in less porous surface areas. An ethylene adsorption study showed that modified MPPCHs exhibited higher adsorption efficiency of ethylene gas than that of Na–BTN due to the non-polar property of the modified functional groups. Subsequently, the electrical conductivity of the modified MPPCHs with various contents of thiol group was investigated to evaluate potential use in ethylene scavenger/sensor applications.
Porous Clay Heterostructure (PCH) is an interesting material to use as entrapping system such as ... more Porous Clay Heterostructure (PCH) is an interesting material to use as entrapping system such as ethylene scavenger, respected to its high surface area with uniform and specific pore size. PCHs have been prepared by the surfactant-directed assembly of mesostructured silica within the two-dimensional galleries of clays. Then, the PCH was synthesized within the galleries of Na-bentonite clay by the polymerization of tetraethoxysilane (TEOS) in the presence of surfactant micelles. In addition, mesoporous clay with organic-inorganic hybrid (HPCH) is modified via co-condensation reaction of TEOS with candidate conductive functional groups (thiol group) and metal loading (silver), designated as MPPCH and Ag-PCH, to enhance surface conductivity of PCH material for using as sensor packaging. Subsequently, all modified PCHs were utilized as ethylene scavenger and blended with polypropylene for producing ethylene scavenging films in food packaging application with various ratios of clay. The morphological, structural, thermal, and mechanical properties were studied and reported in this work. In addition, the modified PCHs and polypropylene/modified PCHs nanocomposite films were also evaluated the potential uses in active packaging and sensor packaging.
Ferroelectrics, 2021
The concept of making composite has been conducted to improve the polarization of polyurethane (P... more The concept of making composite has been conducted to improve the polarization of polyurethane (PU) based polycarbonate diol. Barium strontium titanate (BST), lead-free ceramic with high dielectric and piezoelectric coefficient, was synthesized. To improve the compatibility of BST in PU composites, hydrogen peroxide and 3-aminopropyl trimethoxysilane were used to modify the BST surface. The organic-inorganic composite was synthesized using a prepolymer method by varying types of filler. BST create the physical interaction with PU while modified BST create the chemical interaction with PU in composites. The highest dielectric constant was found in the organic-inorganic composite with surface modified BST.
Novel nanocomposites based on poly(vinylidene difluoride) (PVDF) and modified porous clay were pr... more Novel nanocomposites based on poly(vinylidene difluoride) (PVDF) and modified porous clay were prepared. Bentonite clay was used as starting clay and synthesized as a porous clay heterosturcture (PCH). In addition, the PCH was modified by introduced barium ions into the PCH before blended with PVDF via melt method and then fabricated as a thin film nanocomposite. The optimal ratio between barium ions and PCH was studied and the successful inducement of barium ions into the PCH was confirmed by X-ray fluorescence spectroscopy technique. Moreover, the optimal ratio between modified clay and PVDF was evaluated. Finally, the dielectric behavior of the PVDF-modified clay nanocomposite were investigated and measured as functions of temperature and frequency by using impedance/gain phase analyzer. The results showed that the dielectric constant of the nanocomposite was increased with the amount of modified clay at all frequency and also higher than pure PVDF film.
Carbohydrate Polymers, 2011
ABSTRACT Carbohydrate Polymers j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / ... more ABSTRACT Carbohydrate Polymers j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / c a r b p o l a b s t r a c t Si–O thin film was successfully deposited on bacterial cellulose nanocomposite via plasma enhanced chemical vapor deposition (PECVD) as transparent barrier against water vapor. X-ray photoelectron spec-troscopy (XPS) confirmed consistent Si and O atomic concentrations through the entire depth of the Si–O layer. The Si–O layer had uniform and highly smooth surface – more than 80% of the surface features the surface roughness of 15 nm. The water vapor transmission rate (WVTR) of the bacterial cellulose nanocomposite was evaluated as 9 × 10 −2 g/m 2 /day, but after the deposition of the Si–O barrier layer, the WVTR in the range of 10 −4 g/m 2 /day was achieved. The WVTR property of the nanocomposite can be further adjusted through the operating parameters of PECVD. These properties indicated the quality of the Si–O film as an effective water vapor barrier. Bacterial cellulose nanocomposite deposited with Si–O barrier film can be useful as substrate for flexible organic light emitting diode (OLED) displays.
Industrial Crops and Products, 2012
International Journal of Adhesion and Adhesives
Journal of Materials Science: Materials in Electronics
Materials Today Communications
Journal of Porous Materials
Materials Today: Proceedings
Advanced Materials Research, 2008
Porous Clay Heterostructures (PCHs) have been prepared by the surfactant-directed assembly of mes... more Porous Clay Heterostructures (PCHs) have been prepared by the surfactant-directed assembly of mesostructured silica within the two-dimensional interlayer galleries of clays. The PCH is an interesting material to use as entrapping system such as ethylene scavenger, owing to its high surface area with uniform and specific pore size. In the present work, the PCH was synthesized within the galleries of Na-bentonite clay by the polymerization of tetraethoxysilane (TEOS) in the presence of surfactant micelles. In addition, a mesoporous clay with organic-inorganic hybrid (HPCH) is modified via co-condensation reaction of TEOS with methyltriethoxysilane (MTS) to enhance hydrophobicity of PCH material for entrapping system. According to pore characterization, PCHs have surface areas of 421-551 m2/g, an average pore diameter in the supermicropore to small mesopore range of 4.79-5.02 nm, and a pore volume of 0.57-0.66 cc/g while HPCHs have surface areas of 533-966 m2/g, an average pore diamete...
Polymer Chemistry
The addition of a fluorinated chain improved the polarization in polyurethane, shifted the relaxa... more The addition of a fluorinated chain improved the polarization in polyurethane, shifted the relaxation peaks, and changed the hysteresis loop behavior from a ferroelectric to a paraelectric phase.
Journal of Materials Science: Materials in Electronics
Journal of Polymers and the Environment
Polyol was successfully synthesized from natural palm olein and was used as a starting material f... more Polyol was successfully synthesized from natural palm olein and was used as a starting material for polyurethane foam synthesis. FT-IR spectroscopy was used to confirm of each reaction in the multistep synthesis, including the transesterification, epoxidation, and reaction with ethylene glycol, ultimately producing palm olein-based polyol (POBP) and POBP-containing polyurethane foam. The morphological properties of the prepared foams were investigated by scanning electron microscopy. The foam cells were uniform in size and shape, and a coarse cell structure was observed. While the pristine polyurethane foam contained closed cells, the pore structure became more interconnected with the introduction of POBP. The thermal properties were studied by DSC and TGA. In the presence of POBP, the sample was found to be less thermally stable. Mechanical testing revealed that the tensile strength and Young’s modulus were decreased, while the elongation at break was increased, suggesting that POBP improved the flexibility of the polyurethane foam. This was in agreement with the observed microstructure. Introducing POBP into the polyurethane foam also decreased the water contact angle from 120° to 80°. However, the oil sorption properties were improved due to interconnected pores along the polyurethane foam structure. Its sorption properties for synthetic dyes (methyl orange and rhodamine B) were also evaluated, and superior sorption properties were found for methyl orange. In short, the polyurethane synthesized from POBP exhibited attractive properties as a sorbent material.
Fascinating Fluoropolymers and Their Applications
Journal of Applied Polymer Science