Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Characterization of SiC Fiber Derived from Polycarbosilanes with Controlled Molecular Weight

분자량이 조절된 폴리카보실란으로부터 제조한 SiC Fiber의 특성분석

  • Shin, Dong-Geun (Nano Materials Team, KICET(Korea Institute of Ceramic Engineering and Technology)) ;
  • Riu, Doh-Hyung (Nano Materials Team, KICET(Korea Institute of Ceramic Engineering and Technology)) ;
  • Kim, Younghee (Eco Materials Team, KICET(Korea Institute of Ceramic Engineering and Technology)) ;
  • Kim, Hyung-Rae (Eco Materials Team, KICET(Korea Institute of Ceramic Engineering and Technology)) ;
  • Park, Hong-Sik (DACC Ltd.) ;
  • Kim, Hyoun-Ee (School of Materials Science Engineering, Seoul National University)
  • 신동근 (요업(세라믹)기술원 나노소재팀) ;
  • 류도형 (요업(세라믹)기술원 나노소재팀) ;
  • 김영희 (요업(세라믹)기술원 환경재료팀) ;
  • 김형래 (요업(세라믹)기술원 환경재료팀) ;
  • 박홍식 (주식회사 데크) ;
  • 김현이 (서울대학교 재료공학부)
  • Published : 2005.08.01
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Abstract

Polycarbosilane was synthesized by the Kumada rearrangement of polydimethylsilane in the presence of zeolite (ZSM-5) as a catalyst at $350^{\circ}C$. The prepared polycarbosilane had very low molecular weight ($M_w=500$), so that it was not suitable to fabricate SiC fiber by melt spinning. Further polymerization of PCS was conducted around $400^{\circ}C$ to obtain spinnable polycarbosilane. After polymerization, the polycarbosilanes were isolated by distillation according to the molecular weight distributions. The PCS with a controlled molecular weight distribution was spun into continuous polycarbosilane green fibers. The PCS green fiber was successfully transformed into silicon oxycarbide fiber. The room temperature strength of the SiC fiber was around 1.5 - 1.8 GPa. The oxidation behavior and the tensile strength after oxidation were also evaluated.

Keywords

References

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