Functionalisation and Cross-Linking of Organosilicon Polymers

Abstract

This chapter presents the progress made over the last two decades in the modification (functionalisation) of polysiloxanes as well as curing of polysiloxanes via catalytic hydrosilylation. Well-defined silicones have been prepared by hydrosilylation of functional olefins with polymethylhydrosiloxanes predominantly in the presence of Pt-based catalysts to make a whole branch of materials for adhesives binders, ceramic and dielectric coatings, encapsulates, membranes, sealants and a lot more. On the other hand, the addition of polyfunctional silicon hydrides to poly(vinyl)organosiloxane leads to effective cure of silicon rubber. Pt-complex or other TM-complexes but yet usually Karstedt's catalyst with various inhibitors added to reduce or temporarily inhibit its catalytic activity in the cross-linking, reported since 1990 are compiled. Fast cure can be also effected by radiation methods. Most patents describe the procedures for preparing silicon rubber used for dental materials, improving adhesion to metal, glass and plastics, electric insulators, membranes and many others.