Effects of cononsolvency on gelation of poly(vinyl alcohol) in mixed solvents of dimethyl sulfoxide and water |
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Authors: | Nobuaki TakahashiToshiji Kanaya Koji NishidaKeisuke Kaji |
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Affiliation: | Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan |
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Abstract: | We studied the rates of gelation and phase separation of poly(vinyl alcohol) (PVA) solutions in mixtures of dimethyl sulfoxide (DMSO) and water at 25 °C and found that both the rates show a maximum at a volume fraction of DMSO φDMSO=0.60 while gelation was not observed either in pure DMSO or pure water, suggesting that water-DMSO is a cononsolvent system for PVA. On the basis of the data by Cowie Can J Chem 36 (1961) 2240] we concluded that the 1:2 stable complex between one DMSO molecule and two water molecules is the main cause of this cononsolvency. |
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Keywords: | Poly(vinyl alcohol) Gels Cononsolvency |
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