Abstract
The character of the influence of small amounts of pyridine containing electron donors on the low-temperature polymerization of acrylonitrile initiated by tributyldimagnesium iodide in toluene is determined by the nature of the donor that was selected. Vinyl-2-pyridine and 2-methyl-5-vinylpyridine have a significant retarding effect on the initial step in the process, which ensures a higher rate of polymerization compared with the control experiment, but only after a certain induction period has elapsed. Vinyl-4-pyridine and the unsubstituted pyridine sharply accelerate the polymerization of acrylonitrile leading to a higher maximum degree of conversion of this monomer compared with the process conducted in the absence of an electron donor. An interpretation of the observed kinetic effects is proposed.
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