Method of preparing polycarbosilanes
AssigneeUbe Industries, Ltd.
InventorsTadashi Iwai, Takashi Kawahito, Masahiro Tokuse
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Abstract
A method of preparing polycarbosilanes having high molecular weight and also having the major structural unit of silicon-carbon linkage. The method comprises heating a polysilane at 50.degree.-600.degree. C. in atmosphere of an inert gas and distilling out a low molecular weight polycarbosilane fraction having the number mean molecular weight of 300-600, followed by polymerizing the fraction by heating it at 250.degree.-500.degree. C. in atmosphere of an inert gas. The polycarbosilane obtained by the method of the present invention is useful for the precursor of preparing silicon carbide fibres and shaped articles.
Claims10
A process of preparing polycarbosilanes having high molecular weight and having the repetitive silicon-carbon-silicon linkage as the major structural unit, which comprises heating a polysilane having the repetitive silicon-silicon linkage as the major structural unit at 50.degree.-600.degree. C. in an atmosphere of an inert gas and distilling out a low molecular weight polycarbosilane fraction having the number mean molecular weight of 300-600, and then polymerizing said distilled fraction by heating it at 250.degree.-500.degree. C. in atmosphere of an inert gas to form said high molecular weight polycarbosilane.
Dependencies are inferred from the claim text.