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pH effects on the complexation, miscibility and radiation-induced crosslinking in poly(acrylic acid)-poly (vinyl alcohol) blends

Nurkeeva, Z.S., Mun, G.A., Dubolazov, A.V. and Khutoryanskiy, V.V. (2005) pH effects on the complexation, miscibility and radiation-induced crosslinking in poly(acrylic acid)-poly (vinyl alcohol) blends. Macromolecular Bioscience, 5 (5). pp. 424-432. ISSN 1616-5187

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To link to this article DOI: 10.1002/mabi.200400200

Abstract/Summary

The effect of pH on the complexation of poly(acrylic acid) with poly(vinyl alcohol) in aqueous solution, the miscibility of these polymers in the solid state and the possibility for crosslinking the blends using gamma radiation has been studied. It is demonstrated that the complexation ability of poly(vinyl alcohol) with respect to poly(acrylic acid) is relatively low in comparison with some other synthetic non-ionic polymers. The precipitation of interpolymer complexes was observed below the critical pH of complexation (pH(crit1)), which characterizes the transition between a compact hydrophobic polycomplex and an extended hydrophilic interpolymer associate. Films prepared by casting from aqueous solutions at different pH values exhibited a transition from miscibility to immiscibility at a certain critical pH, pH(crit2), above which hydrogen bonding is prevented. It is shown here that gamma radiation crosslinking of solid blends is efficient and only results in the formation of hydrogel films for blends prepared between pH(crit1), and pH(crit2). The yield of the gel fraction and the swelling properties of the films depended on the absorbed radiation dose and the polymer ratio.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > School of Pharmacy
ID Code:13675
Uncontrolled Keywords:hydrogels, hydrogen bonding, interpolymer complexes, miscibility, polymeric blends, radiation crosslinking , LINKED PVA MEMBRANES, DILUTE AQUEOUS-SOLUTIONS, GAMMA-RAY IRRADIATION, POLY(VINYL ALCOHOL), PERVAPORATION SEPARATION, INTERPOLYMER COMPLEXES, POLYVINYL-ALCOHOL, POLYACRYLIC-ACID, WATER MIXTURES, SENSITIVE HYDROGELS

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