Effect of Rh.., Pb. and Cd. on the photographic properties of AgC1 emulsion, in which the copolymer of acrylamide, acrylic acid and vinylimidazole, was used as a protective colloid, was investigated and compared with that of gelatin emulsion, which was made by the same formula.
Effect of Rh.. appears similarly in any polymer or gelatin emulsion, while the effects of Pb. and Cd. change according to the kind of protective colloid.
Action of Pb.. is affected more strongly by carboxylic groups in polymer, than by imidazole groups. Action of Cd. is affected strongly by imidazole group, and carboxyl group has little influence.
It is considered that Rh.. affects the properties of emulsion, acting directly to AgCl grains, and Pb. and Cd. act in combination with polymers. In this case, Pb. combines strongly with carboxyl group in the polymer molecules, and Cd.. forms coordinate compound with imidazole group.
Photographic properties of AgCI-synthetic polymer emulsion show very sharp change at a certain pH value or Cl
- ion concentration.
View full abstract