THE EFFECT OF HEAT TREATMENT ON THE VISCOSITY AND THE MOLECULAE WEIGHT DISTRIBUTION OF PHOTOGRAPHIC GELATINS
Yanxu Fu · 1996
Thepaper presents a study on the effect of heat treatment on the viscosity and the molecular weight distribtuon of the four photographic gelatins.The experimental results indicate that the viscosity and the number average molecular weight of photographic gelatins are decreased when the heating temperature is increased.The viscosity and the number average molecular weight of photographic gelatins are closely related.Caused by decreasing of the number average molecular weight,the viscosity of photographic gelatins is decreased.Under our experimental condition,the critical heating temperature of inert gelatin and active gelatin is proposed less than 75℃ and less than 60℃ respectively for modified gelatin.