Copolymers containing Si-N and Si-Si bonds, polycarbosilazanes and silicon garnitolides obtained by thermal decomposition of the copolymers, and a process for producing the same

摘要

Polymers containing -Si-N and -Si-Si- bonds, characterised in that they are obtained by polycondensation… - of at least one silane of formula RR1SiCl2… - and of at least one silazane of formula …IMAGE… in which formulae… - R2 is a halogen atom, preferably Br and Cl… - R, R1 and R3, which are identical or different, denote a hydrogen atom or an optionally functional alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, aryl, alkylaryl or alkenylaryl hydrocarbon radical,… - a process for the preparation of the said copolymers,… - the polycarbosilazanes obtained by thermolysis of the said copolymers and the silicon carbonitrides obtained by heating the said polycarbosilazanes.