Abstract
Abstract The radiation-induced polymerization of acrylonitrlle in frozen aqueous zinc chloride solution was carried out at low temperatures. A marked enhancement both in the rate and the degree of polymerization was observed at zinc chloride/acrylonitrile molar ratios above unity, which indicated the importance of formation and stabilization of complexes in the frozen medium. The rate of polymerization R was found to follow the relation, R α [M-ZnCl2]2 I, where I is the dose rate and [M-ZnCl2] is the concentration of zinc chloride complexed with equimolecu-lar monomer. It is considered that the role of zinc chloride is here dual, both as a reagent for complex formation and also as a source of initiating species on irradiation. The effect of coexisting saturated nitriles were also discussed.
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