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Metallocene Catalytic Insertion Polymerization of 1-Silene to Polycarbosilanes.


ABSTRACT: Metallocene of zirconium were used as a catalyst for an insertion polymerization of 1-methylsilene directly into pre-ceramic precursor polyzirconocenecarbosilane (PZCS) during dechlorination of dichlorodimethylesilane by sodium, which exhibits high catalytic effectiveness with the maximum conversion ratio of polycarbosilane up to 91%. The average molecular weights of polymers synthesized are less than 1400, all with very narrow polymolecularities. The mechanism of catalytic polymerization was assumed to be similar to a coordination insertion polymerization of 1-olefins by metallocenes. The obtained PZCS show high ceramic yields with formation of composite ceramics of ZrC-SiC, which are novel polymeric precursors of ultra-high temperature ceramic (UHTC) fiber and composite.

SUBMITTER: Tian Y 

PROVIDER: S-EPMC4635340 | BioStudies | 2015-01-01

SECONDARY ACCESSION(S): 10.1038/srep16274

REPOSITORIES: biostudies

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