IMPROVEMENTS OF SOME PHYSICAL-PROPERTIES IN GELATIN LAYERS

The effect of copolymer formation in situ in the photographic layer by the reaction between the gelatin, a cyclodextrin derivative and a diepoxy crosslinking agent was investigated. The melting point increase, the swelling ability and the optical rotatory dispersion were determined. The photographic characteristics were investigated in silver bromide layers containing gelatin-cyclodextrin copolymer. It has been found that the copolymer makes rapid diffusion of the developing agent possible at a low water absorption and high degree of hardening of the layer. This feature can be explained by the decrease of the hydration of polypeptide chains by copolymer formation and the favourable spatial structure of the copolymer molecules.