화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.35, No.1, 17-22, January, 2011
Export Citation
펠렛형 MWCNT를 사용한 PP/MWCNT 나노복합체 물성 연구
Properties of PP/MWCNT Nanocomposite Using Pellet-Shaped MWCNT
정동석, 남병욱†
  • 한국기술교육대학교 응용화학공학과
Dong-Seok Jeong, and Byeong-Uk Nam†
  • Department of Applied Chemical Engineering, Korea University of Technology and Education, Chungnam 330-708, Korea
E-mail:
초록
본 연구에서는 폴리프로필렌(PP)/다중벽 탄소나노튜브(MWCNT)복합체를 이축압출기를 사용하여 펠렛형 MWCNT를 20 wt%까지 함량별로 제조하고, MWCNT가 20 wt% 첨가된 복합체를 마스터배치 (M/B)로 사용하여 함량별로 다시 PP와 컴파운딩하여 희석하였다. PP/MWCNT 복합체는 함량 변화에 따라 전기전도도, 열전도도, 모폴로지, 열적, 고체 점탄성, 기계적 성질을 조사하였고, 또한 희석된 PP/MWCNT 복합체와 1단계 PP/MWCNT 복합체 간의 물성을 비교하였다. 전기전도도와 열전도도는 MWCNT의 함량이 3 wt% 일 때 percolation threshold 현상을 보였고, M/B로 제조된 복합체가 더 우수한 전도도를 보였다. 복합체의 MWCNT 함량이 증가하면 비등온 결정화 온도 및 열분해 온도가 증가하였다. 모폴로지를 통하여 M/B로 제조된 복합체의 MWCNT 길이가 짧아진것을 확인하였고, 이는 기계적 물성의 향상에 도움을 준 것으로 나타났다.
Polypropylene/multi-walled carbon nanotube(PP/MWCNT) composites along with various MWCNT contents up to 20 wt% were prepared by a twin screw extruder. Nanocomposites having 20 wt% MWCNT as a master batch(M/B) were diluted with PP by way of melt compounding. The electrical/thermal conductivity, morphology, thermal/viscoelastic/mechanical properties were investigated with the variation of MWCNT contents. Also, we compared some properties between 1-step PP/MWCNT and the diluted PP/MWCNT composites. The percolation threshold of electrical and thermal conductivity was measured at about 3 wt% MWCNT. And conductivity of diluted PP/MWCNT composites were superior to those of PP/MWCNT composites. The non-isothermal crystallization temperature and thermal decomposition temperature appeared at higher temperatures with increasing MWCNT contents. Morphology showed that length of MWCNT in diluted PP/MWCNT composites was shortened by twice melt blending, which contributed to improve the tensile strength of PP/MWCNT composites.
Keywords:MWCNT;electrical conductivity;thermal conductivity;morphology;mechanical property
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