UV‐activated hydrosilylation: a facile approach for synthesis of hyperbranched polycarbosilanes |
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| Authors: | Guo‐Bin Zhang Jie Kong Xiao‐Dong Fan Xin‐Gui Li Wei Tian Mei‐Rong Huang |
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| Institution: | 1. The Second Artillery Equipment Academy, Beijing 100085, People's Republic of China;2. Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China;3. Institute of Materials Chemistry, Key Laboratory of Advanced Civil Engineering Materials, College of Material Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China |
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| Abstract: | A facile approach for synthesis of hyperbranched polycarbosilane from AB2 monomer via UV‐activated hydrosilylation is presented in this communication. The polymerization process was monitored using real‐time FTIR spectroscopy and the resulting hyperbranched polycarbosilanes were characterized using 1H‐NMR, 13C‐NMR, 29Si‐NMR and SEC/MALLS. It is found that hyperbranched polycarbosilane can be synthesized from methyldiallylsilane via UV‐activated hydrosilylation with bis(acetylacetonato)platinum(II) as catalyst. The polymerization activated by UV irradiation was much faster than that under thermal conditions. The similar degree of branching, average number of branch units and the exponent of the Mark–Houwink equation demonstrate that the hyperbranched polycarbosilane synthesized via UV‐activated polyhydrosilylation possesses almost the same branching structure as that synthesized via thermal‐activated polyhydrosilylation. Copyright © 2009 John Wiley & Sons, Ltd. |
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| Keywords: | hyperbranched polycarbosilane UV hydrosilylation |
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