Homopolymerization and Copolymerization of Alkenyldichlorosilanes by Reductive Coupling

摘要

Sonochemical reductive coupling of dichlorosilanes containing allyl and 5-hexenyl group leads to the formation of high molecular weight polymers and oligomeric fractions. Both products contain unreacted alkenyl groups. These results indicate that radicals are short living intermediates in the reductive coupling process, and that radicals are rapidly converting to more stable polymeric silyl anions. Resulting homopolymers of allylmethyldichlorosilane, allylphenyldichlorosilane and 5-hexenylphenyldichlorosilane as well as their copolymers with phenylmethyldichlorosilane absorb above 330 nm which is typical for long chain catenation of silicon atoms. Keywords: Polysilanes, Silyl radical, Silyl anions, Alkenyl groups mechanism. (JES)