J. C. Salamone, E. Ellis, D. F. Bardoliwalla
Mar 8, 2007
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Journal
Journal of Polymer Science: Polymer Symposia
Abstract
In this work are discussed the reactions of 2-vinylpyridine and 2-methyl-5-vinylpyridine with dilute and concentrated acid solutions. In reactions with dilute acid, the concept of pyridyl-ethylation leading to initiation of polymerization was studied for both monomers. Although this reaction was applicable for 2-vinylpyridinium salts, it apparently did not occur with 2-methyl-5-vinylpyridinium salts. In reactions with concentrated acid, both monomers have been found to polymerize spontaneously to high molecular weight polymers. In addition, an analysis of the neutralized polymers by gel permeation chromatography (GPC) has shown them to be of narrow molecular weight distribution. An investigation of the effect of air or oxygen on these reactions has shown that they do not significantly alter the resulting molecular weights or molecular weight distributions that can be obtained. From a study of the percent conversion versus time, the data obtained indicated that these spontaneous polymerization reactions are chain-growth processes.