Abstract
Abstract It was found that trialkylboron is an excellent catalyst for the polymerization to some olefins which have comparatively large polarities. Vinylchloride and acrylonitrile were polymerized with this catalyst at a comparatively low temperature, and white polymers were usually obtained. Vinylchloride was polymerized in bulksolution- and emulsion-system, and the rate of polymerization or the relation between the yield and the concentration of catalyst was investigated. Generally, the molecular weight of the polyvinylchloride was small (less than 50,000). The polymerization of acrylonitrile was studied chiefly in a solution system. Usually, the molecular weight of polyacrylonitrile was fairly large.
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