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Synthesis and properties of liquid polycarbosilanes with hyperbranched structures

Authors

  • Muhe Huang,

    1. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
    2. Fujian Key Laboratory of Advanced Materials, College of Materials, Xiamen University, Xiamen 361005, China
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  • Yunhui Fang,

    1. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
    2. Fujian Key Laboratory of Advanced Materials, College of Materials, Xiamen University, Xiamen 361005, China
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  • Ran Li,

    1. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
    2. Fujian Key Laboratory of Advanced Materials, College of Materials, Xiamen University, Xiamen 361005, China
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  • Tianhua Huang,

    1. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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  • Zhaoju Yu,

    Corresponding author
    1. Fujian Key Laboratory of Advanced Materials, College of Materials, Xiamen University, Xiamen 361005, China
    • Fujian Key Laboratory of Advanced Materials, College of Materials, Xiamen University, Xiamen 361005, China
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  • Haiping Xia

    Corresponding author
    1. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
    2. Fujian Key Laboratory of Advanced Materials, College of Materials, Xiamen University, Xiamen 361005, China
    • College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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Abstract

Liquid polycarbosilanes substituted by unsaturated groups were prepared by a one-pot synthesis with Cl2Si(CH3)CH2Cl, Cl3SiCH2Cl, and CH2[DOUBLE BOND]CHCH2Cl (or HC[TRIPLE BOND]CMgBr) as the starting materials. The as-received polycarbosilanes were characterized by gel permeation chromatography, Fourier transform infrared spectroscopy, and nuclear magnetic resonance and were confirmed to have hyperbranched structures. The polymer yield, Si[BOND]H content, side reaction, unsaturated group content, and polymer structure are affected by the amount of the starting materials in feed. The thermal properties of the polycarbosilanes were investigated by thermogarvimetric analysis. The ceramic yield of allyhydridopolycarbosilane is about 60% and that of ethynylhydridopolycarbosilane is over 75%, indicating that the liquid polycarbosilanes have great potential to be promising precursors to SiC. Moreover, the compositions of the polycarbosilanes and the final ceramics can be tailored by controlling the amount of the starting materials. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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