Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Optimum Mixing Ratio of Epoxy for Glass Fiber Reinforced Composites with High Thermal Stability

에폭시 배합비에 따른 내열성 복합재료 최적조건

  • Shin, Pyeong-Su (Department of Materials Engineering and Convergence Technology, Gyeongsang National University) ;
  • Wang, Zuo-Jia (Department of Materials Engineering and Convergence Technology, Gyeongsang National University) ;
  • Kwon, Dong-Jun (Department of Materials Engineering and Convergence Technology, Gyeongsang National University) ;
  • Choi, Jin-Yeong (Department of Materials Engineering and Convergence Technology, Gyeongsang National University) ;
  • Sung, Ill (Advanced Composite Materials Institute, Hankuk Carbon) ;
  • Jin, Dal-Saem (Advanced Composite Materials Institute, Hankuk Carbon) ;
  • Kang, Suk-Won (Advanced Composite Materials Institute, Hankuk Carbon) ;
  • Kim, Jeong-Cheol (Advanced Composite Materials Institute, Hankuk Carbon) ;
  • Park, Joung-Man (Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University)
  • Received : 2014.03.11
  • Accepted : 2014.07.18
  • Published : 2014.08.31
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Abstract

The optimum condition of glass fiber/epoxy composites was investigated according to mixing ratio of two epoxy matrices. Novolac type epoxy and isocyanate modified epoxy were used as composites matrix. Based on chemical composition of mixing matrix, optimum mixing ratio of epoxy resins was obtained through various experiments. In order to investigate thermal stability and interface of epoxy resin, glass transition temperature was observed by DSC instrument, and static contact angle was measured by reflecting microscope. Change of IR peak and $T_g$ was conformed according to different epoxy mixing ratio. After fabrication of glass fiber/epoxy composites, tensile, compression, and flexural properties were tested by UTM by room and high temperature. The composites exhibited best mechanical properties when epoxy mixing ratio was 1:1.

2개 이상의 에폭시 기지재의 배합비를 이용하여 최적의 에폭시 복합재료를 제조하였다. 이 실험에서 노볼락계 에폭시 및 아이소시아네이트계 에폭시를 기지재로 사용하였다. 그에 따라 화학적 조성의 변화를 이용하여 다양한 실험을 통한 최적의 에폭시 배합비를 유추하였고, 에폭시의 내열성 및 계면을 파악하기 위하여 열중량측정기를 이용하여 유리전이온도의 변화를 파악하였고 정적 접촉각을 측정하였다. 기계적 물성을 파악하기 위하여 에폭시 배합비에 따른 유리섬유/에폭시 복합재료의 인장, 압축, 굴곡강도를 상온에서 및 노화시간에 따라 파악하였다. 에폭시와 유리섬유간 계면을 개념도로 나타냈다. 시험 결과 에폭시 배합비에 따른 적외선 피크 및 유리전이온도 변화를 확인하였다. 서로 다른 에폭시의 배합비가 1:1일 때 기계적물성이 상대적으로 좋은 것을 확인하였다.

Keywords

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