Abstract

Abstract Radiation-induced polymerization of acrylonitrile (AN) in the ZnCl2-AN-H2O ternary system was carried out at temperatures ranging from 30 to −78°C, and correlation between the polymerization rate and the concentration of complexed AN with zinc atom was clarified. The selected systems were in the supercooled liquid state at −78CC with the molar composition ratio of ZnC12:AN:H2O of 1:1:3. The polymerization is free-radical in character. The 0.5-power dependence of the polymerization rate on the dose rate at 30°C indicates bimolecular termination, while the 0.9-power dependence at −78°C shows predominant unimolecular termination because of the high viscosity of the systems at Just above the glass transition temperature. The negative temperature dependence of the polymerization rate is indicative of the tendency of the complex concentration to increase with lower temperatures. The polymerization rate, therefore, is proportional to the 2 and 1.5 powers of the complex concentration at −78 and 30°C, res...

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