Citation: Wei Jian Han, Ji Dong Hu, Li Ye, Song Shi, Xue Yu Tao, Tong Zhao. Synthesis and pyrolysis of oligo (methylsilylene)-ethynylene polymer to near-stoichiometric SiC ceramic[J]. Chinese Chemical Letters, ;2010, 21(11): 1299-1302. doi: 10.1016/j.cclet.2010.06.008 shu

Synthesis and pyrolysis of oligo (methylsilylene)-ethynylene polymer to near-stoichiometric SiC ceramic

Wei Jian Han ^a,b, ,
Ji Dong Hu ^a ,
Li Ye ^a,b ,
Song Shi ^c ,
Xue Yu Tao ^a,b ,
Tong Zhao ^a

a Laboratory of Advanced Polymer Materials, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
b Graduate University of the Chinese Academy of Sciences, Beijing 100190, China;
c National Key Laboratory of Advanced Functional Composite Materials, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China

Received Date: 15 March 2010

Fund Project: The authors gratefully acknowledge the financial support of the National Science Foundation of China (No.50903086) and the Chinese Academy of Sciences.

Oligo (methylsilylene)-ethynylene polymer with erosslinkable ethynyl unit in the main chain was synthesized by condensation of α, ω-dicholorooligo (methylsilane) with dilithioacetylene. The as-synthesized polymer was characterized by GPC, FT-IR and NMR. The results showed ethynyl group was successfully introduced to the polymer main chain. The ceramic yield was dramatically increased by the cross-polymerization of ethynyl group, and the excess silicon of PMS was compensated. Nearstoichiometric (C/Si=1.17) and partial crystallization β-SiC monoliths were obtained by pressureless pyrolysing PSPA at 1200℃in a high yield (73.6 wt%).
- Polymethylsilane,
- Silicon carbide,
- Precursor,
- Crosslinkable
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