Synthesis and pyrolysis of oligo(methylsilylene)-ethynylene polymer to near-stoichiometric SiC ceramic |
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| Authors: | Wei Jian Han Ji Dong Hu Li Ye Song Shi Xue Yu Tao Tong Zhao |
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| Institution: | 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 |
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| Abstract: | Oligo(methylsilylene)-ethynylene polymer with crosslinkable 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. Near-stoichiometric (C/Si=1.17) and partial crystallization β-SiC monoliths were obtained by pressureless pyrolysing PSPA at 1200°C in a high yield (73.6 wt %). |
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| Keywords: | Polymethylsilane Silicon carbide Precursor Crosslinkable |
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