Sang-Woog Ryu

Room temperature baroplastic processing of PS/PBA nano-blends

AbstractRoom temperature baroplastic processing of polystyrene (PS) and poly(n-butyl acrylate) (PBA) was investigated through the formation of nanoblends of their polymer nanoparticles. Instead of core-shell or block copolymer structures, PS and PBA nanoparticles were synthesized separately through aqueous emulsion polymerization and then mixed and precipitated. The resulting nano-blends provided semi-transparent molding at 25 °C under applied pressure, resembling that of core-shell and block copolymer baroplastic systems. Differential scanning calorimetry measurements of the compressed samples revealed the presence of intermixing glass transition between the two components, which indicated baroplastic processing. However, PS/poly(lauryl methacrylate) blends exhibited no intermixing glass transition, indicating no pressure-induced miscibility between the two phases.

Synthesis and Electrochemical Properties of Solid Polymer Electrolytes Using BF3LiMA as Monomer

Solid polymer electrolytes using BF3LiMA as monomer were synthesized by usual one step radical polymerization in THF solvent. The effect of BF3LiMA concentration on ionic conductivity and electrochemical stability was investigated by AC impedance measurement and linear sweep voltammetry. As a result, the highest ionic conductivity reached 7.71 × 10 �6 S cm �1 at 25 o C was obtained in 12.9 wt% of BF3LiMA content. Further increase or decrease of BF3LiMA content result to decrease the ionic conductivity due to the brittle matrix properties in former case and the insufficient number of charge carrier in the latter case. Furthermore, since the counter-anion was immobilized in the self-doped solid polymer electrolytes, high elec- trochemical stability up to 6.0 V was observed even in 60 o C.

Synthesis and Physicochemical Properties of Branched Solid Polymer Electrolytes Containing Ethylene Carbonate Group

본 연구에서는 glycerol-1,2-carbonate와 4-chloromethyl styrene을 함유하는 공중합체를 합성하고, poly(ethylene glycol) methyl ether 와의 Williamson 반응을 이용하여 poly(ethylene glycol)이 가지로 도입됨과 동시에 높은 유전상수의 에틸렌 카보네이트를 함유하는 고분자전해질을 제조하였다. 흥미롭게도 전해질의 상온 이온전도도는 7 mol%의 에틸렌 카보네이트를 포함하는 가지형 고분자에서

Synthesis and Ionic Conductivity of Polystyrene Derivative Containing Cyclic Carbonate

1.75{\times}10^{-5}S\;cm^{-1}

Synthesis of Crosslinked Poly(POEM-co-AMPSLi-co-GMA) Electrolytes and Physicochemical Properties

으로 가장 높게 얻어졌고, 이때 [EO]:[Li] 비율의 최적화는 32:1이었다. 또한 에틸렌 카보네이트기의 존재에 의해 고분자전해질의 전기화학적 안정성을 5.5 V까지 확보할 수 있었다. 【In this study polymer electrolytes containing ethylene carbonate group which have a high dielectric constant and poly(ethylene glycol) as branches were prepared by the Williamson reaction between poly(ethylene glycol) methyl ether and block copolymers composed of glycerol-1,2-carbonate and 4-chloromethyl styrene. Interestingly, the highest ionic conductivity of

Synthesis of Self-doped Poly(PEGMA-co-BF3LiMA) Electrolytes and Effect of PEGMA Molecular Weight on Ionic Conductivities

1.75{\times}10^{-5}S\;cm^{-1}

Synthesis of Poly(MMA-co-PEGMA) Electrolytes by Grafting-onto Method and Effect of Composition on Ionic Conductivities

was observed from the polymer electrolyte having 7 mol% of ethylene carbonate and the [EO]:[Li] ratio of 32:1. Moreover, it was found that the electrochemical stability of polymer electrolyte was achieved up to 5.5 V because of the presence of ethylene carbonate.】

Lithium Ion Concentration Dependant Ionic Conductivity and Thermal Properties in Solid Poly(PEGMA-co-acrylonitrile) Electrolytes

본 실험에서는 cyclic carbonate를 함유하는 styrene 유도체 VBCE를 Williamson 반응으로 합성하였으며 일반적인 조건에서 고분자중합까지 가능함을 보여주었다. 합성한 poly(VBCE)는 PEGMA와의 블렌드를 통하여 고분자전해질로 제조되었으며 이온전도도에 미치는 조성의 영향을 평가하였다. 흥미롭게도 poly(VBCE)의 함량이 0, 1.9, 5.8 mol%로 증가한 경우, 상온 이온전도도는 각각

Effect of Lithium Ion Concentration on Electrochemical Properties of BF3LiMA-based Self-doping Gel Polymer Electrolytes

4.2{\times}10^{-5}

Synthesis and electrochemical properties of lithium methacrylate-based self-doped gel polymer electrolytes

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