| 분자량이 조절된 폴리카보실란으로부터 제조한 SiC Fiber의 특성분석 |
| 신동근, 류도형, 김영희1, 김형래1, 박홍식2, 김현이3 |
요업(세라믹)기술원 나노소재팀
1요업(세라믹)기술원 환경재료팀
2주식회사 데크
3서울대학교 재료공학부 |
| Characterization of SiC Fiber Derived from Polycarbosilanes with Controlled Molecular Weight |
| Dong-Geun Shin, Doh-Hyung Riu, Younghee Kim1, Hyung-Rae Kim1, Hong-Sik Park2, Hyoun-Ee Kim3 |
Nano Materials Team, KICET(Korea Institute of Ceramic Engineering and Technology)
1Eco Materials Team, KICET(Korea Institute of Ceramic Engineering and Technology)
2DACC Ltd.
3School of Materials Science Engineering, Seoul National University |
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| ABSTRACT |
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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. |
| Key words:
SiC fiber, Polycarbosilane, Zeolite, Melt-spinning, Polymerization |
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