期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 110, 期 2, 页码 921-928出版社
JOHN WILEY & SONS INC
DOI: 10.1002/app.28679
关键词
amorphous; fibers; high temperature materials; polycondensation; pyrolysis
资金
- National Defense Basic Research Foundation of China [A2820060068]
- National High Technology Research and Development Program of China [2006AA03A217]
- National Natural Science Foundation of China [50702075]
- State Key Laboratory, of Advanced Ceramic Fibers and Composites [9140C8203050603]
A preceramic Polymer for Si-B-N-C fiber, polyborosilazane, has been synthesized by one-step condensation reaction of dichloromethylsilane, BCl3, and hexamethyldisilazane with high yield. The reaction mainly involves the condensation of Si-Cl and B-Cl with N-SiMe3 followed by SiMe3Cl evaporation and dehydrogenation between N-H and Si-H. The resulted polymer is a soluble colorless transparent solid with melting point of 70 C and molecular weight of 10,800. The backbone of the polymer is mainly composed of -Si-N-B-bridge with son e borazine rings. The polymer exhibits good processability and flexible Polymer fibers with diameter of 15-20 pm were obtained by melt spinning. Pyrolysis of the as-synthesized polymer to 1000 degrees C under nitrogen atmosphere results in a ceramic yield of 63 wt%, and the Obtained Si-B-N-C ceramic remains fully amorphous up to 1700 C, and only small amount of poorly crystallized BN, Si3N4, a Phases were observed upon heating at 1850 C. (c) 2008 Wiley Periodicals, Inc.
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