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.
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