Solvent effects on several polymerizations under high pressure (The co-operative researches on the fundamental studies of the liquid phase reactions at high pressures)

Abstract

As one of investigations about the effects of solvent on chemical reactions under high pressure, some polymerizations and copolymerizations in solution were studied under the pressure up to 4, 000kg/cm^2. In the polymerization of vinylacetate, the chain transfer to solvent was influenced with the pressure. At the polymerization of itaconic acid, a new phenomenon named as critical pressure of polymerization was found which showed various values referring to the solvents used. Also, the polymerization of vinylchloride was carried out under high pressure and the polymers having isotactic crystallinity were obtained. As for the copolymerization, both vinylchloride and crotonaldehyde were copolymerized with various olefinic monomers, and the progressive effect of the pressure would be appeared for the conjugated monomers participated. And the difficulties or easiness of these copolymerization were compared under high pressures.