The Experts below are selected from a list of 165 Experts worldwide ranked by ideXlab platform
Thalappil Pradeep - One of the best experts on this subject based on the ideXlab platform.
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Tribochemical Degradation of Polytetrafluoroethylene in Water and Generation of Nanoplastics
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Ananya Baksi, Jyotirmoy Ghosh, Vishal Kumar, Biswajit Mondal, Tripti Ahuja, Thalappil PradeepAbstract:Polytetrafluoroethylene (PTFE) is probably the most extensively used chemically inert and Thermally Stable Polymer. We report the degradation of PTFE in water in the presence of common metals and c...
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Tribochemical Degradation of Polytetrafluoroethylene in Water and Generation of Nanoplastics
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Abhijit Nag, Ananya Baksi, Jyotirmoy Ghosh, Vishal Kumar, Biswajit Mondal, Tripti Ahuja, Soumabha Bag, Thalappil PradeepAbstract:Polytetrafluoroethylene (PTFE) is probably the most extensively used chemically inert and Thermally Stable Polymer. We report the degradation of PTFE in water in the presence of common metals and c...
Yasunari Maekawa - One of the best experts on this subject based on the ideXlab platform.
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a novel characterization method for graft Polymer structures chemically attached on Thermally Stable Polymer films
Macromolecular Chemistry and Physics, 2012Co-Authors: Kazuyuki Enomoto, Shuichi Takahashi, Yasunari MaekawaAbstract:Most Polymer grafts in grafted Polymer films obtained by radiation-induced solid graft Polymerization are not analyzed in detail due to difficulties in isolation of the grafts without structural decomposition. Herein, a novel structural and molecular weight characterization method is reported for Polymer grafts that are chemically attached to Thermally and chemically Stable Polymer substrates, based on a swelling-induced graft detachment in hot water. Polymer grafts prepared by the radiation-induced Polymerization of alkyl acrylate into poly(ethylene-co-tetrafluoroethylene) (ETFE) followed by a sulfonation reaction are found to have a ternary coPolymer structure whose monomer units contain –COOH or –SO3H groups, or both.
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A Novel Characterization Method for Graft‐Polymer Structures Chemically Attached on Thermally Stable Polymer Films
Macromolecular Chemistry and Physics, 2011Co-Authors: Kazuyuki Enomoto, Shuichi Takahashi, Yasunari MaekawaAbstract:Most Polymer grafts in grafted Polymer films obtained by radiation-induced solid graft Polymerization are not analyzed in detail due to difficulties in isolation of the grafts without structural decomposition. Herein, a novel structural and molecular weight characterization method is reported for Polymer grafts that are chemically attached to Thermally and chemically Stable Polymer substrates, based on a swelling-induced graft detachment in hot water. Polymer grafts prepared by the radiation-induced Polymerization of alkyl acrylate into poly(ethylene-co-tetrafluoroethylene) (ETFE) followed by a sulfonation reaction are found to have a ternary coPolymer structure whose monomer units contain –COOH or –SO3H groups, or both.
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degradation manner of Polymer grafts chemically attached on Thermally Stable Polymer films swelling induced detachment of hydrophilic grafts from hydrophobic Polymer substrates in aqueous media
Journal of Materials Chemistry, 2011Co-Authors: Kazuyuki Enomoto, Shuichi Takahashi, Takanori Iwase, Takashi Yamashita, Yasunari MaekawaAbstract:The degradation manner of graft-type Polymer electrolyte membranes consisting of hydrophilic poly(styrenesulfonic acid) (PSSA) graft Polymers (grafts) and Thermally and mechanically Stable hydrophobic Polymer substrates such as crosslinked poly(tetrafluoroethylene) (cPTFE), poly(ethylene-co-tetrafluoroethylene) (ETFE), and poly(ether ether ketone) (PEEK) was examined in water at 85 and 95 °C. Severe weight loss was observed in PSSA-grafted cPTFE and ETFE films but not in a PSSA-grafted PEEK film. The decomposed extracts in water were characterized as PSSA during the whole course of degradation, clearly showing that the PSSA grafts detached from the fluorinated substrates without decomposition or scission of graft Polymer chains. This is quite a new degradation manner for graft-type Polymer electrolyte membranes. PSSA-grafted PEEK films showed severe weight loss in aqueous propanol solutions making PSSA grafts swell; clear correlation was observed between the degree of swelling in PSSA grafts and the film weight loss. The solubility parameters between grafts and the Polymer substrates and small angle neutron scattering (SANS) data implied that the grafted films possessing a clear boundary at the interface resulted in significant weight loss. From the above observation, it should be concluded that hydrophilic PSSA grafts detach from hydrophobic Polymer substrates due to swelling-induced stress at the interfacial boundary in the grafted films.
Ananya Baksi - One of the best experts on this subject based on the ideXlab platform.
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Tribochemical Degradation of Polytetrafluoroethylene in Water and Generation of Nanoplastics
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Ananya Baksi, Jyotirmoy Ghosh, Vishal Kumar, Biswajit Mondal, Tripti Ahuja, Thalappil PradeepAbstract:Polytetrafluoroethylene (PTFE) is probably the most extensively used chemically inert and Thermally Stable Polymer. We report the degradation of PTFE in water in the presence of common metals and c...
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Tribochemical Degradation of Polytetrafluoroethylene in Water and Generation of Nanoplastics
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Abhijit Nag, Ananya Baksi, Jyotirmoy Ghosh, Vishal Kumar, Biswajit Mondal, Tripti Ahuja, Soumabha Bag, Thalappil PradeepAbstract:Polytetrafluoroethylene (PTFE) is probably the most extensively used chemically inert and Thermally Stable Polymer. We report the degradation of PTFE in water in the presence of common metals and c...
Hongyu Wang - One of the best experts on this subject based on the ideXlab platform.
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An acrylated fullerene derivative for efficient and Thermally Stable Polymer solar cells
Tetrahedron Letters, 2017Co-Authors: Jin-long Wang, Xue-qiang Chen, Xiang Yao, Li-na Liu, Wen-jing Xiao, Hongyu WangAbstract:Abstract The continuous microstructure evolution occurring in active layers of Polymer-fullerene solar cells is one of the main causes for their device instability. With aim to tackle it, this work developed a new Polymerizable fullerene acceptor, [6,6]-phenyl-C 61 -butyl acrylate (PC 61 BA). It was found that PC 61 BA has similar light-absorption properties and HOMO and LUMO energy levels as [6,6]-phenyl-C 61 -butyric acid methyl ester (PC 61 BM), and can be converted into insoluble oligomers upon heating at 150 °C. Polymer-fullerene solar cells using poly(3-hexylthiophene) (P3HT) as donor and PC 61 BA as acceptor exhibited an optimized efficiency of 3.54%, the performance comparable to P3HT/PC 61 BM cells (optimized efficiency: 3.70%). But, the former possess much better thermal stability than the latter owing to aggregation suppression by the Polymerized PC 61 BA. These results indicate that PC 61 BA, unlike most previous reported, is a unique Polymerizable fullerene derivative that can be used alone as acceptor to achieve both efficient and Thermally Stable Polymer solar cells.
Hiroyuki Ohno - One of the best experts on this subject based on the ideXlab platform.
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Thermally Stable Polymer gel electrolytes composed of branched polyimide and ionic liquid zwitterion mixture prepared by in situ polycondensation
Chemistry Letters, 2008Co-Authors: Masahiro Tamada, Saori Ueda, Takahiro Hayashi, Hiroyuki OhnoAbstract:Branched polyimide was synthesized by in situ polycondensation of 4,4′-oxydianiline, pyromellitic dianhydride, and 1,3,5-tri(4-aminophenyl)benzene in ionic liquid/zwitterion mixture. Compatibility between network and ionic liquids is important to keep gel shape and ionic conductivity. Only 6.0 wt % of polyimide was enough to keep gel state without phase separation or leakage. The obtained polyimide gel showed excellent thermal stability with decomposition temperature of above 300 °C, low glass-transition temperature, and Stable ion conduction in a wide temperature range.
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Preparation of Thermally Stable Polymer electrolytes from imidazolium-type ionic liquid derivatives
Polymer, 2005Co-Authors: Hiromitsu Nakajima, Hiroyuki OhnoAbstract:Abstract Thermally Stable Polymer electrolytes based on ionic liquids were prepared and analyzed. Mono-functional ionic liquid monomers, ionic liquid cross-linkers, and ethylimidazolium-type ionic liquid salts were mixed and Polymerized. The ionic liquid-type cross-linkers were effective to prepare Thermally Stable Polymer films. In particular, the coPolymerization of cross-linker and ethylimidazolium-type ionic liquid monomers were used to make Polymer electrolytes with high ionic conductivities. The coPolymerization in ethylmethylimidazolium bis(trifluoromethanesulfonyl)imide gave a transparent film showing no thermal degradation up to 400 °C.