Emulsion Copolymerization of Silicon Dihydrides and Diacetylenic Hydrocarbons

摘要

The copolymerization used chloroplatinic acid and related catalysts. The highest molecular weight copolymers were based on chloroplatinic acid catalyzed methylphenysilane and 1, 6 heptadiyne. They were tacky, elastic gums that crosslinked readily upon storage at room temperature. Refluxing the polymers in a benzene solution of an epoxy compound minimized premature crosslinking. No change was noted in the tackiness of the polymers. The type of emulsifier (anionic, cationic, nonionic) used had a considerable effect on the final molecular weight of chloroplatinic acid catalyzed methylphenylsilane-1,6 heptadiyne polymers. Recipes containing anionic soaps gave the highest molecular weights. However, this observation did not hold true for other catalysts or other monomer combinations. In an effort to obtain silcarbane elastomers having improved thermal stability the unsaturated methylphenylsilane-1,6 heptadiyne rubbers were hydrogenated. Unfortunately, the hydrogenated polymers were non-rubbery solids. (Author)