Abstract

AbstractA method is described for determining the velocity constant for chain transfer in a vinyl polymerization to a relatively weak transfer agent which occupies a significant volume fraction of the reaction mixture. The method is particularly useful for cases in which precipitation of the polymer by the transfer agent would occur in the absence of an additional solvent. Some results for the acrylonitrile–dimethylformamide–water system are given, and the observed anomalous chain transfer behavior is interpreted in terms of the formation of a hydrate of dimethylformamide which is believed to be inert with respect to growing acrylonitrile radicals.

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