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 die poxy crosslinking agent was investigated. The melting point increase, the swelling ability and the optical rotatory dispersion were determin ed. The photographic characteristics were investigated in silver bromi de layers containing gelatin-cyclodextrin copolymer. It has been found that the copolymer makes rapid diffusion of the developing agent poss ible at a low water absorption and high degree of hardening of the lay er. This feature can be explained by the decrease of the hydration of polypeptide chains by copolymer formation and the favourable spatial s tructure of the copolymer molecules.