Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

Hydrolysis of dimethyldichlorosilane with water in the presence of HClO₄ leads, under certain conditions, to the formation of a defined dication of high initiation efficiency. For the dication formation the initial mixture must contain the excess of hydrolysable Cl^- over H⁺ from water and HClO₄. It is described the course of one-step and two-step hydrolysis and the efficiency of low-pressure removal of equilibrium volatiles. The dication formed is characterized by its molecular weight and by the content of ClO₄^- and Cl^-. Infrared and NMR spectra give the evidence that -Si-OH groups are present in the amount of less than 1% of the total Si⁺ClO₄^- groups. The initiation efficiency and the dication character of its initiator have been proved by polymerisation tests.