Ageing of poly(vinyl alcohol) gels prepared from dimethylsulfoxide/water solutions

In order to elucidate the structure of poly(vinyl alcohol) (PVA) gels, the gels studied were aged for as long as 500 days at 30°C. The original gel was formed from PVA solutions in a mixed solvent of dimethylsulfoxide (DMSO) and water by chilling at −34°C for one day. The aged gel was shown to have...

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Bibliographic Details
Published in:Polymer (Guilford) 1994-01, Vol.35 (12), p.2573-2578
Main Authors: Tanigami, Tetsuya, Murase, Kazuhiro, Yamaura, Kazuo, Matsuzawa, Shuji
Format: Article
Language:English
Subjects:
ageing
Applied sciences
Exact sciences and technology
gels
Organic polymers
Physicochemistry of polymers
poly(vinyl alcohol)
Properties and characterization
Solution and gel properties
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Summary:In order to elucidate the structure of poly(vinyl alcohol) (PVA) gels, the gels studied were aged for as long as 500 days at 30°C. The original gel was formed from PVA solutions in a mixed solvent of dimethylsulfoxide (DMSO) and water by chilling at −34°C for one day. The aged gel was shown to have a well grown crystal phase, in that the melting endotherm from differential scanning calorimetry could be clearly separated into two or three components, which were named A, B and C, in order of melting temperature. The enhancement of the gel modulus and the solvent exclusion observed in the aged DMSO/water gels could be atrributed to phase separation, which facilitates crystallization into the B and C components. The A component was shown not to bear a strong relationship to the high modulus and the exclusion of solvent, although it may be the most common crystallite grown from PVA solutions.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(94)90381-6