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Aqueous solutions of poly(vinyl alcohol) (PVA)/poly(vinylpyrrolidone) (PVP) mixtures containing up to 10% PVP were submitted to repeated freezing/thawing cycles in order to prepare physical hydrogels for potential biomedical applications. Porous structure of the PVA/PVP lyophilized samples and their morphology in cross-section and surface were evaluated by scanning electron microscopy and discussed...
Rheological behavior of poly(vinyl alcohol) (PVA) and poly(N-vinyl pyrrolidone) (PVP) mixtures in aqueous solutions and hydrogel state was investigated. The complex dependence of the viscosity on PVA/PVP mixture composition could be attributed to cumulative effects of electrostatic interactions, hydrogen bonding or association phenomena. Physical hydrogels were prepared by freezing/thawing method...
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