Polymer(Korea), Vol.44, No.5, 603-609, September, 2020
복합 개질제가 도입된 폴리프로필렌의 내충격성과 내마모성 및 결정화 거동에 관한 연구
Study on Impact Resistance, Wear Resistance and Crystallization Kinetics of Polypropylene Modified by Complex Crosslinkers
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초록
환경 규제의 강화로 인하여 이산화탄소의 배출을 줄이기 위해 자동차 산업에서는 경량소재에 대한 연구가 활발하게 이루어지고 있다. 이러한 경량화 소재들 중, 폴리프로필렌(PP)은 저렴한 생산 비용과 우수한 가공성으로 인해 자동차 산업에서 많은 관심을 받고 있다. 그러나 PP는 다양한 자동차 부품 소재로 사용하기에는 낮은 내충격성과 내마모성을 보인다. 본 연구에서는 이러한 PP의 문제점을 개선하기 위해 선형의 PP를 이축 압출기를 통해 개시제 및 trimethylolpropane trimethacrylate(TMPTMA)와 divinylbenzene(DVB)의 개질제들을 복합적으로 도입하여 분지화 및 가교 구조의 PP를 제작하였다. 개질된 PP는 선형의 PP와 비교하여 성형성은 비슷하게 유지하면서도 내충격성과 내마모성이 개선되었다. 이렇게 향상된 특성들은 분지화 및 가교로 인한 PP의 결정화 거동에 영향을 받은 것으로 판단된다.
As environmental regulations become strict, automobile industry has focused on the light material to reduce carbon dioxide emission. Among these light materials, polypropylene (PP) has received considerable attention in the automobile industry because of low cost and good processability. However, the PP has low impact resistance and wear resistance to be used in various automotive parts. To improve the impact resistance and wear resistance, in this study, linear PP was branched and/or crosslinked by the initiator with the crosslinkers of trimethylolpropane trimethacrylate (TMPTMA) and divinylbenzene (DVB) through the twin screw extruder. The modified PP improved the impact resistance and wear resistance than those of linear PP while keeping process flowability. It is considered that the crystallization kinetics of branched and/or crosslinked PP have an influence on the improved properties.
Keywords:polypropylene;complex crosslinkers;impact resistance;wear resistance;crystallization kinetics
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