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Physically crosslinked watery gels of a dialyzed pigskin gelatin of type A are investigated by means of equilibrium runs at 10 and 20°C. From the data of the Schlieren patterns the swelling pressure-concentration curves can be calculated. It can be shown that equilibria are achieved in all cases and that the swelling pressure which is calculated for a given concentration is independent of the rotational...
Different concentrated thermoreversible gelatin/water and k-carrageenan/water gels prepared from non-dialyzed polymer material are set into an ultracentrifugal field and investigated by means by equilibrium runs at 20°C. The refractive index gradient and the movement of the meniscus gel/solvent during the process of swelling and deswelling is observed with the Schlieren optical system. From the Schlieren...
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