The hardenability of gelatin films has been investigated by measurement of swelling ratio, number of crosslinks and molecular weight distribution of sol fraction hardened gelatin films. The hardeners used were 2, 4-di-chloro-6-hydroxy-s-triadine and glutaraldehyde. The relationships between viscosity of original gelatin and swelling ratio, number of crosslinks and molecular weight distributions of sol fractions of gelatin films hardened in different concentrations of the above hardeners were studied. The following were suggested from the results.
(a) The stable hardening level of gelatin was controlled by concentration of hardener and was independent from type of gelatin.
(b) The hardenability of gelatin was independent from its row material or its manufacturing process, but the sol fraction of hardened gelatin film was dependent on viscosity (corresponding to average molecular weight) of gelatin which was related to its row material or its manufacturing process.
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