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Functionalization and further crosslinking of the nicalon polycarbosilane based on its metalation with the n‐butyllithium—postassium t‐butoxide reagent
Author(s) -
Seyferth Dietmar,
Lang Heinrich
Publication year - 1991
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.590050603
Subject(s) - polysilane , metalation , chemistry , hydrosilylation , reagent , polymer , polymer chemistry , dimethylsilane , butyllithium , nuclear chemistry , organic chemistry , catalysis
Reaction of the Nicalon polycarbosilane with the n‐BuLi/Me 3 COK reagent resulted in metalation of approximately one CH 2 group in four. Reaction of the metalated polymer with Me 2 (CH 2 = CH)SiCl gave a Me 2 (CH 2 = CH)Si‐substitued Nicalon polycarbosilane. The polymer was heated with different amounts of the [(MeSiH) ∼0.8 (MeSi) ∼0.2 ] n polysilane in the presence of azobisisobutyronitrile in refluxing benezene. Hydrosilylation by the SiH‐containing polysilane of the CH 2 CH groups of the Me 2 (CH 2 CH) Si‐substituted Nicalon polycarbosilane gave a new hybrid polymer (when appropriate quantities of reactant polymers were used) whose pyrolyis in a stream of argon to 1000°C left a ceramic residue in 77% yield whose elemental analysis indicated a nominal composition of 91% by weight SiC and 9% C.