title: 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.
authors.affiliation: State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Yuelong
authors.initials: Y
authors.lastname: Tian
authors.affiliation: State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Min
authors.initials: M
authors.lastname: Ge
authors.affiliation: State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Weigang
authors.initials: W
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Xiaoxu
authors.initials: X
authors.lastname: Lv
authors.affiliation: State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Shouquan
authors.initials: S
authors.lastname: Yu