Rheology of adhesives. Part V. The rigidity modulus of gelatin gels

Abstract

The influence of various factors, like concentration, temperature, additives, etc. on the rigidity of gelatin gels was studied. The lower the temperature and the higher the concentration of gelatin the higher is the rigidity. A minimum concentration is necessary for gel formation and at 35° practically no rigidity is developed up to a concentration of 35%. Curves for different concentrations demonstrating the effect of temperature seem to converge at 35°C. Salts like sodium chloride, etc. at small concentrations increased the rigidity. The influence of hydrogen bond favouring agents, depressants, wood extractives, etc. on the rigidity of gelatin gels was investigated and the interesting results reported.