Abstract
A study has been made of the polymerizations of anethole, isobutylvinylether and cyclohexylvinylether by iodine in ethylene dichloride solution, at 25° under high vacuum in the presence of a constant or periodically reversed polarity d.c. field. The influences of the reversal frequency, distance between the electrodes as well as mechanical stirring of the solution on the electric field effect (measured as R PE/ R PO) have been investigated. Experiments were carried out to evaluate separately, in both compartments of the cell, the amounts of titratable iodine and polymer formed as well as the polymerization rate after the electric field application. The field induced rate enhancement can be cancelled by suitable reversal frequencies and mechanical stirring, and depends on the distance between the electrodes. The results confirm that the field effect is mainly due to concentration gradients of active species as a consequence of field induced electrolytic phenomena.
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