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Copolymerization of styrene and acrylonitrile in liquid SO2 was conducted at 50°C. with αα′‐azobiisobutyronitrile as an initiator. Relations between the over‐all reaction rate and the initial concentration of each reactant were given. The composition of the copolymer in mole ratio was determined from the elementary analysis, and the result was compared with the theoretical values calculated from two different mechanisms. The agreement obtained by the calculation based on an assumption that the polymerization reaction proceeds via formation of a complex between sulfur dioxide and styrene was better than that obtained on a mechanism of direct polymerization of free sulfur dioxide.
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Matsuda et al. (1962) studied this question.
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