: In this study, poly(methyl methacrylate-b-tert-butyl methacrylate) with controlled molecular weight and composition was synthesized by high vacuum anion polymerization and branched polymers, poly[methyl methacrylate-b-poly(ethylene glycol) methacrylate], poly(MMA-b-PEGMA) were synthesized by hydrolysis and grafting-onto reaction. Grafting-onto reactions had many steric hindrances and coupling efficiency decreased as the content of methacrylic acid (MA) increased. As a result, the branched polymer contained both PEGMA and unreacted MA. Their relative amounts affected the physical properties of the polymer and T_g was found to decrease as the amount of MA decreased. Also, the formation of a complex by the introduction of lithium salt resulted in a decrease in flexibility and an increase in the T_g. From the electrochemical investigation, good ionic conductivity was exhibited in polymer electrolyte having low T_g.

: 본 연구에서는 고진공 음이온중합을 통해 분자량 및 조성이 조절된 poly(methyl methacrylate-b-tert-butyl methacrylate)를 합성하고 가수분해 및 grafting-onto 반응을 통해 가지형 고분자인 poly[methyl methacrylate-b-poly(ethylene glycol) methacrylate], poly(MMA-b-PEGMA)를 제조하였다. Grafting-onto 반응 결과 많은 입체적 장애가 발생하였으며, methacrylic acid(MA)의 함량이 많을수록 커플링 효율이 감소하였다. 그 결과, 가지형 고분자에는 반응에 참여한 PEGMA와 미반응 MA가 동시에 존재하게 되었다. 이들의 상대적인 양이 고분자물성에 영향을 주었으며 특히 MA가 적게 존재할수록 상대적으로 낮은 T_g를 나타내었다. 또한 전기화학 측정결과, 양호한 이온전도도는 낮은 유리전이온도를 가지는 고분자 전해질에서 발현되었다

Keywords: anionic polymerization, hydrolysis, grafting-onto, branched polymer, ionic conductivity