Abstract
AbstractThe interactions between photographic gelatin and couplers employed in colour photography (derived from acylacetanilides and, in a few cases, from pyrazolones series) have been studied by viscometry, determining the effect of the addition of different amounts of couplers on the viscosity of aqueous solutions of gelatin. In particular, the effect of the length of the antidiffusional aliphatic chain of the couplers has been examined, as well as that of molecular weight and concentration of gelatin. Some synthetic polymers, having in their macromolecules the same functional groups as are present in gelatin, have also been investigated for comparative purposes: the hydroxyl groups seemed to be the major ones responsible for the interactions. The results obtained are briefly reported and discussed in terms of intra- and inter-molecular aggregations.
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