친환경 저비중 자기보강 복합소재 개발을 위한 공정 변수별 영향도 평가
Study of Mechanism for Improving Tensile Elastic Modulus of Self-reinforced Composite
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초록
폴리프로필렌 기반 자기보강 복합재는 기지재와 보강재가 동일한 소재로 구성되어 기존 섬유강화 복합재와 달리 섬유와 기지재의 분리없이 바로 재활용이 가능할 뿐 아니라 폴리프로필렌 수준까지 저 비중화가 가능한 고분자 복합재이다. 본 연구에서는 더블벨트 라미네이터 공정기술을 이용하여 압력, 온도, 냉각조건과 같은 공정 변수가 폴리프로필렌으로 제조된 자기보강 복합재의 인장 물성에 미치는 영향을 연구하였다. XRD, DSC를 이용하여 결정구조의 변화에 따라 인장 탄성계수는 0.2~1.2 GPa로 약 6배까지 향상되는 것을 확인하였다. SEM 분석을 통해 함침 정도를 확인함으로써 자기보강 복합재의 함침 후 형상 변화 또한 고찰하였다.
Abstract
Tensile properties of polypropylene based self-reinforced composites were investigated as a function of process variables of the double-belt lamination equipment such as pressure, temperature and cooling conditions. Elastic modulus was enhanced approximately 6 times from 0.2 to 1.2 GPa. The improvement mechanism was studied by identification of crystalline structure changes using DSC and XRD analysis. In addition, morphology change of self-reinforced composites was also investigated by SEM analysis in order to reveal the degree of impregnation.
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