화학공학소재연구정보센터
HWAHAK KONGHAK, Vol.39, No.5, 635-640, October, 2001
PP-g-MA/층상 실리케이트 나노복합체에서의 분자량에 대한 영향
The Effect of Molecular Weight of PP-g-MA/Layered Silicate the Nanocomposites
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초록
분자량이 다른 PP-g-MA를 매트릭스로 사용하여 용융삽입법을 통하여 PP-g-MA/층상 실리케이트 나노복합체를 제조하여, 분자량효과를 살펴보았으며 최종 모폴로지가 기계적 물성 및 유변학적 거동에 어떤 영향을 주는지를 살펴보았다. 메트릭스 고분자의 분자량의 차이는 고분자의 삽입속도(intercalation rate) 뿐 아니라 최종 형태구조(morphology)에도 영향을 미침을 확인할 수 있었다. 분자량이 작은 LMPP가 분자량이 큰 HMPP보다 더 빠른 삽입속도를 보였으며 큰 분자량의 HMPP의 경우 C18M에 단지 삽입(intercalation) 됨에 반해 분자량이 작은 LMPP는 C18M을 박리(exfoliation)시킨다. 또한 최종 실리케이트층의 분산도 차이는 기계적특성 및 유변학적 거동에 크게 영향을 미쳤다. 분산도가 높은 박리형의 나노복합체는 실리케이트 함량에 따라 상대 점도 증가 폭이 가장 컸으며 분산도가 가장 낮은 HMPP/MMT 복합체는 점도 증가가 거의 없었다.
The effect of molecular weight of matrix polymer for the maleated polypropylene/clay nanocomposites prepared by melt intercalation method was investigated. Two kinds of maleated polypropylenes with similar grafting level of maleic anhydride, but with different molecular weight, were used. The molecular weight of a matrix polymer profoundly affects not only the intercalation kinetics but also the final morphology of maleated polypropylene nanocomposites. One maleated polypropylene(LMPP) with low molecular weight fast exfoliates and the other(HMPP) with high molecular weight slowly intercalates into the organically modified clay. In addition, the final morphology has a significant influence in the mechanical and rheological properties. The exfoliated nanocomposite shows the largest increase of the mechanical and rheological properties. The deintercalated nanocomposite shows the smallest increase of the properties.
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