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RISS 인기검색어
- 검색키워드
- 저자 : Moon Mandal (검색결과 2 건)
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Study of Properties of Modified Soybean Oil Based Composite Reinforced with Chicken Feather
Gitashree Gogoi,Moon Mandal,Tarun K. Maji 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5
In present days bio-fibers have attracted many researchers in the field of polymer composites due to theiroutstanding properties that nature has conferred on them. In this study, epoxidized soybean oil (ESO) was reacted withmethacrylic acid and then by methacrylic anhydride, along with suitable catalyst to form methacrylic anhydride basedepoxidized soybean oil (MAESO) resin. Chicken feather fibers were used as reinforcing agents in polymer composites due totheir high specific strength and modulus. The ratio of fiber/resin was taken as 30:70. The synthesis of resin was confirmed byfourier transfer infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopy. The interaction between the resin andchicken feather was studied by fourier transform infrared (FTIR) spectroscopy and SEM studies. The thermal stability andmechanical properties of the composites with/without styrene were evaluated using thermogravimetric analyser (TGA) anduniversal testing machine (UTM). Flame retardancy, water vapour uptake, and chemical resistance properties of thecomposites with/without styrene, were also studied.
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Modulating Ion Transport and Self-Assembly of Polymer Electrolytes via End-Group Chemistry
Jung, Ha Young,Mandal, Prithwiraj,Jo, Gyuha,Kim, Onnuri,Kim, Minju,Kwak, Kyungwon,Park, Moon Jeong American Chemical Society 2017 Macromolecules Vol.50 No.8
<P>We report a rational design of solid-state dry polymer electrolytes with high conductivity, high mechanical strength, and improved cation transference number. Thiol ene click chemistry provided orthogonal control over the type and number of end groups in poly(styrene-b-ethylene oxide) (PS-b-PEO) block copolymers. This approach permitted the synthesis of PEO chains with reduced crystallinity, reminiscent of PEO oligomers, thereby playing a key role in improving the room temperature conductivity. Intriguingly, the incorporation of diol or dicarboxylic acid end groups in PS-b-PEO produced a well-defined gyroid structure, leading to order of magnitude improvements in the storage modulus. Out of the various samples examined, the electrolytes bearing terminal diol displayed the highest ionic conductivity and a 2 -fold increase in lithium transference number. The improvements in performance are attributed to the reduced interchain aggregation and the anion stabilization mediated by the terminal diol group. The fact that the dramatic changes in ion transport and mechanical properties of PS-b-PEO samples were brought about solely by the modification of single terminal group of the PEO unit confirmed end-group chemistry as a powerful tool for the design of efficient solid-state polymer electrolytes. This work should find applications in various emerging electrochemical technologies, namely those employed in energy storage and conversion.</P>
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