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Title: Effect of non-associated electrolyte solutions on the behaviour of poly(vinyl alcohol)-based hydrogels
Authors: Patachia, Sílvia 
Valente, Artur J. M. 
Baciu, Claudia 
Keywords: Poly(vinyl alcohol); Hydrogel; Electrolytes; Swelling; Collapse
Issue Date: 2007
Citation: European Polymer Journal. 43:2 (2007) 460-467
Abstract: The aim of this paper is to present the behaviour of the poly(vinyl alcohol) hydrogels [PVA-HG] in sodium and potassium chlorides aqueous solutions, due to their interactions. The tested [PVA-HG]-s have been obtained by repeated freezing and thawing cycles. White, heterogeneous hydrogels have been obtained. These hydrogels exhibit a mechanical active behaviour at their contact with electrolytes aqueous solutions, manifested by important changing in mass, volume and density of the hydrogel samples. These modifications could be explained by water elimination from the hydrogels that initially reached the equilibrium of swelling. The kinetic of the water desorption and the reversibility of this process, have been studied and some of the factors that influence this behaviour have been evidenced. The sensitivity of PVA hydrogels to electrolyte nature and concentration could be used in sensors design and also could explain some aspects of electrolytes diffusion through PVA membranes and targeted drugs delivery.
DOI: 10.1016/j.eurpolymj.2006.11.009
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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