Chemical properties of organooligocyclosilazanes and the synthesis of polymers on their basis

Abstract

Reactions of organooligocyclosilazanes with acids, alcohols, phenols and silanols of various functionality have been investigated. The opening of cyclic fragments of oligomer molecules via the SiN bond and the condensation of functional groups are shown to be accompanied, in most cases, by a regrouping of primary and tertiary amino groups into secondary ones. At higher temperatures catalytic reactions of transamination and radical substitution of organic groups at the Si atom by silylaminyl groups are more prominent. It was found that silicon-nitrogen-containing polymers of block structure and also crosslinked polymers may be prepared from organooligocyclosilazanes in the presence of an alkali or an organosilicon peroxide, or under the action of γ-radiation.