Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Characterization of PMMA/MWNT Composites Fabricated by a Twin Screw Extruder

이축 압출기를 이용하여 제조된 PMMA/MWNT 복합체의 특성 분석

  • Woo, Jong-Seok (Department of Polymer Science and Engineering, Kumoh National Institute of Technology) ;
  • Lee, Geon-Woong (Korea Electrotechnology Research Institute) ;
  • Kye, Hyoung-San (Department of Materials and Design, Mokwon University) ;
  • Shin, Kyung-Chul (Department of Polymer Science and Engineering, Chungju National University) ;
  • Bang, Dae-Suk (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
  • 우종석 (금오공과대학교 고분자공학과) ;
  • 이건웅 (한국전기연구원 CNT전극전문연구랩) ;
  • 계형산 (목원대학교 디자인소재학과) ;
  • 신경철 (국립충주대학교 나노고분자공학과) ;
  • 방대석 (금오공과대학교 고분자공학과)
  • Published : 2007.09.29
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Abstract

MWNTs have been widely investigated due to unique properties of such as good electrical conductivity and thermal stability in polymer composites industries. This paper established the procedure to fabricate PMMA/MWNT composites by a modular intermeshing co-rotating twin screw extruder with L/D ratio of 42. The electrical properties of PMMA/MWNT composites with different content of MWNT have been investigated. A sheet resistance percolation was observed at 4 wt% of MWNT for the melt processed composites. Sheet resistance of PMMA/MWNT composite film containing 4 wt% of MWNT was nearby $10^4{\Omega}/sq$ and this shows the possibility of potential application to EMI (Electronic Magnetic Interference) shielding materials. The characteristics of composites were analyzed by TGA, DSC, and SEM. In addition, MFI (Melt Flow Index) has been measured to analyze the rheological property.

최근 들어 전기적, 기계적 성질이 우수한 다중벽탄소나노튜브(Multi-Walled Carbon Nanotubes)/고분자 복합재료에 대한 연구가 활발히 진행 중이다. 본 연구에서는 모듈라 치합형 동방형 회전 이축 압출기(Modular Intermeshing Co-Rotating Twin Screw Extruder, L/D=42)를 이용하여 PMMA/MWNT 복합체를 제조하였다. 이렇게 제조된 PMMA/MWNT 복합체의 표면저항을 측정한 결과 MWNT의 함량이 4 wt% 일 때 $10^4{\Omega}/sq$를 나타내어 전자파차폐(Electronic Magnetic Interference) 물질로 응용할 수 있는 가능성을 확인하였다. 그리고 열중량 분석기 (Thermogravimetric Analysis), 시차주사열량계(Differential Scanning Calorimeter)를 이용한 열적특성, 주사전자현미경(Scanning Electron Microscopy)을 통하여 형태학적 변화를 분석하였다. 또한 유변학적 특성을 알아보기 위해 용융흐름지수(Melt Flow Index)를 측정하였다.

Keywords

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