Behavior of Hydrophillic Polymers as Protective Colloid for Silver Halide Crystals (V):The Influence of the Conditions of Polymerization of AM-VI-AA Copolymers

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Amphoteric Polymers were prepared by the copolymerization of acrylic acid (AA), acrylamide (AM) and 1-vinyl-2-methylimidazole (VI), or by the hydrolysis of copolymer of the later two. Turbidity curves of these polymers were determined and compared with that of gelatin.<BR>Polymers which contain relatively many imidazole groups, restrain the growth of AgCl crystals, while the carboxylic acid groups weaken the action of the imidazole groups, and when the action of the two groups were "balanced ", the polymer shows the same turbidity curve as gelatin.<BR>Polymers, the method of preparation of which are different from each other, percentages of three groups, required to give " balanced " polymer, is different. This difference is supposed to be caused by the difference of the arrangements of the active groups in the polymer molecules.<BR>By adding various amount of isopropylalcohol to the polymerizing mixture, we can obtain a series of copolymers, polymerization degree of which is different. It is experimentally found that there exists a certain relation between the induction period (time to reach a certain turbidity) and the degree of dispersion, and the both change with the degree of polymerization. But the ripening rate (rate of growth after a certain turbidity) is not affected by the degree of polymerization.
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