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윤선규,이영관,( Chalathorn Chanthad ),조미숙 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Modified cellulose fiber and poly ether sulfone (PES) composite film was prepared by a simple solution casting for low coefficient of thermal expansion (CTE) without sacrificing transmittance. The modified cellulose fiber was fabricated by a bromination and copolymerization with poly(acrylic acid) (PAA) and polystyrene (PS) [CPP fiber]. Here, PAA provides to enhance the dispersion of CPP fiber in PES matrix, while PS to improve the compatibility between CPP fiber and PES. CPP/PES composite film was obtained using by a solution casting in DMF. The optical and mechanical property and morphology of the composite film were investigated by scanning electron microscopy, CTE, and transmittance. Modified cellulose fiber can lead to disperse well in PES matrix, to maintain high transmittance, and to reduce the CTE value of PES film.
Jin, Jiezhu,Lu, Sheng‐,Guo,Chanthad, Chalathorn,Zhang, Qiming,Haque, M. A.,Wang, Qing WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.33
<P><B>Multiferroic laminate composites</B> consisting of chain‐end cross‐linked ferroelectric polymers and magnetostrictive Metglas are reported. The composites exhibit a greatly enhanced multiferroic voltage coefficient and sensitivity relative to analogous composites. These remarkable properties are attributed to high piezoelectric and electromechanical coupling coefficients, because of the formation of larger crystalline sizes and concurrent improvement in the polarization ordering in the cross‐linked polymers.</P>
Crosslinked Gel Polymer Electrolytes for Si Anodes in Li-Ion Batteries
Lee, Jeong Hun,Kim, Soochan,Cho, Misuk,Chanthad, Chalathorn,Lee, Youngkwan The Electrochemical Society 2019 Journal of the Electrochemical Society Vol.166 No.13
<P>Gel polymer electrolyte (GPE) membrane was prepared by the facile amine-epoxy crosslinking reaction of poly(ethylene glycol)diglycidylether (PEGDE) with diamino-poly(propylene oxide) (DPPO) and subsequent immersion in 1 M LiPF<SUB>6</SUB> solution. To apply GPE for Si anode in a Li-ion battery, the physical properties were optimized by the degree of crosslinking which was controlled by molecular weight of each part. The crosslinked GPE membrane composed of PEGDE(1,000 g mol<SUP>−1</SUP>) and DPPO (4,000 g mol<SUP>−1</SUP>) exhibited desirable dimensional stability, low electrical resistance, adequate ionic conductivity of 1.0 mS cm<SUP>−1</SUP> at 25°C. The Si anode cell employing this GPE exhibited enhanced battery performance of 2,434 mAhg<SUP>−1</SUP> and 80% cyclic retention after 100 cycles. The well-optimized cGPE with desirable physical properties could resolve the issues of safety and stability resulted from volume expansion of Si as well as Li dendrite formation.</P>
Epoxidized Natural Rubber/Chitosan Network Binder for Silicon Anode in Lithium-Ion Battery
Lee, Sang Ha,Lee, Jeong Hun,Nam, Dong Ho,Cho, Misuk,Kim, Jaehoon,Chanthad, Chalathorn,Lee, Youngkwan American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.19
<P>Polymeric binder is extremely important for Si-based anode in lithium-ion batteries due to large volume variation during charging/discharging process. Here, natural rubber-incorporated chitosan networks were designed as a binder material to obtain both adhesion and elasticity. Chitosan could strongly anchor Si particles through hydrogen bonding, while the natural rubber could stretch reversibly during the volume variation of Si particles, resulting in high cyclic performance. The prepared electrode exhibited the specific capacities of 1350 mAh/g after 1600 cycles at the current density of 8 A/g and 2310 mAh/g after 500 cycles at the current density of 1 A/g. Furthermore, the cycle test with limiting lithiation capacity was conducted to study the optimal binder properties at varying degree of the volume expansion of silicon, and it was found that the elastic property of binder material was strongly required when the large volume expansion of Si occurred.</P> [FIG OMISSION]</BR>