Polymeric micro spheres with different structure of surface, narrow distribution of particles dimensions, having «nucleus-envelope» structure were synthesized. The polymeric micro spheres were applied into protection layers of emulsion photographic materials. The influence of polymeric micro spheres to sensitometric characteristics of light-sensitive photographic materials was studied. The possibility of using them as antistatic components was shown.
The influence of ammonium sulfate concentration in aqueous sybfase on the parameters of 2D films was investigated. It was observe that, adding of electrolyte is causing the growth of parameters of isotherm due to gidrophobisacia of microsphere because of changes in double electrical layer.
The influence of a chemical modification (hardening) on the behavior of photographic gelatins at an interface has been investigated. It has been established, using the Langmuir monolayer method, that the properties of the surface layers of a modified gelatin change at the water-air interface and the depth of modification influences the surface activity of the gelatin. The surface properties of gelatin gels were investigated by the method of wetting depending on the hardener nature and the gelatin molecular-mass composition. It has been established that the hydrophilicity of gelatin gels increases with increase in the content of α-chains and the surface of gelatin gels is additionally hydrophilized as a result of their modification.
This review is devoted to the analysis of various aspects of gelation in gelatin and multicomponent gelatin-containing systems. Gelation mechanisms in gelatin-water systems upon varying polymer content in the solution are discussed in detail. New data concerning a sol-gel transition at gelatin concentrations above the gelation threshold are presented, and models describing gelation in highly concentrated solutions are outlined. Principal phenomena related to the effect of various modifying additives (glycerol, electrolytes, hydrocarbon- and fluorine-containing surfactants, high-molecular-mass compounds, and tanning agents) are reviewed, and the effect of microheterogeneous additives on the properties of gels based on gelatin-containing multicomponent systems is considered. A crucial problem concerning thermal stability of gels is discussed separately. Special attention is focused on the effect of structuring processes in gelatin (tanning) that lead to the chemical modification of polypeptide gelatin chains, as well as on the influence of the above processes on the properties of gels and their surfaces. In addition to traditional theological parameters, characterizing structural and mechanical properties of gelatin gels, the presented analysis involves the data on durability of gelatin gels and its variations under the action of added components with various modifying potency.
The properties of photographic gelatins in the aqueous phase were studied as influenced by hardeners of various types. The effect of molecular-weight distribution of gelatins, reagent ratios, and temperature on hardening was analyzed.
The influence of the interaction of gelatin with a protected formaldehyde tanning agent on the rheological parameters of interphase adsorption layers formed at the interface of a 0.1% aqueous solution of gelatin–metaxylene has been investigated as a function of the mass‐molecular distribution of initial gelatins. It has been shown that the chemical modification of gelatin with tanning agents weakens the process of gel formation in the interphase layer directly with the depth of the tanning process. This dependence is the most pronounced for gelatin with a high content of fractions with a molecular mass of more than 285 kDa.