Abstract
Anionic copolymerization of α,ω-bis(trimethylsiloxy)polydimethylsiloxane with 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane in the presence of α,ω-bis(tetramethylammoniumoxy)polydimethylsiloxanolate was studied by means of gas-liquid chromatography, gel-permeation chromatography, and 29Si NMR techniques. It was shown that the equilibrium homopolymerization of the cyclic comonomer initially took place and it was not until its conversion became greater than 90% that linear poly(dimethylsiloxane) was involved in the reaction. It was found that a constant molecular mass is reached before the linear siloxane-cyclosiloxane equilibrium and a random distribution of units in the copolymer are established. The dependence of the total amount of cyclosiloxanes at equilibrium on the dimethylsiloxy-to-methylvinylsiloxy unit ratio in the reaction system was determined.
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