Viscosity properties of gelatin in solutions of monovalent and divalent Salts

다국어 초록 (Multilingual Abstract)

The viscosity behaviors of gelatin with and without salts were examined in details by a rotational viscometer and a horizontal gravitational capillary viscometer, ranging from extremely dilute to entangled regimes. It was found that gelatin in salt free solution behaviors as neutral polymer in θ solvent. Polyelectrolyte effect can be found in extremely dilute regime. For gelatin/NaCl solution, the concentration dependence of specific viscosity showed that gelatin behaviors as neutral polymer in good solvent. The two critical concentration c* and ce of gelatin solutions with and without NaCl moved from 4.0 wt% and 14.0 wt% to 2.0 wt% and 12.0 wt%, respectively. Addition of salts can improve the gelatin viscosity. It is the characteristic of a polyampholyte. The viscosity increased more significantly in CaCl2 than that in NaCl solutions. Moreover, the effect of Ca2+ is notable in gelatin solution with high concentrations, especially in entangled solutions.

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