Method for preparing polyaluminocarbosilane |
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| Authors: | Guomei He Jiangxi Chen Lifu Chen Haiping Xia Litong Zhang |
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| Affiliation: | Advanced Materials Laboratory, College of Chemistry and Chemical Engineering and College of Materials, Xiamen University, Xiamen 361005, China |
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| Abstract: | Polyaluminocarbosilane (PACS) was synthesized directly by the one‐pot reaction of polydimethylsilane (PDMS) with aluminum acetylacetonate [Al(acac)3] in an autoclave. In this closed system, all the aluminum in Al(acac)3 was converted into PACS. Therefore, the content of aluminum could be readily controlled quantitatively. On the basis of Fourier transform infrared, 1H‐NMR, 13C‐NMR, 29Si‐NMR, and 27Al magic‐angle spinning NMR analysis, the reaction mechanism was proposed as follows: PDMS dissociated during pyrolysis to generate silicon free radicals, and then they reacted with Al(acac)3 to yield PACS containing (Si? O)nAl groups (n = 4, 5, or 6). Meanwhile, these reactions resulted in the cleavage of O? C and/or O?C bonds in Al(acac)3. Some of the free‐radical fragments generated by this cleavage continued to react with the silicon free radicals and were incorporated into the structural units of PACS; the rest of them may have been converted into small oxygen‐containing compounds, which were removed in the subsequent processing after the reactions. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 |
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| Keywords: | heteroatom‐containing polymers polysilanes synthesis |
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