Synthesis, characterization and swelling properties of a chemically cross-linked poly(vinyl alcohol) hydrogel |
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Authors: | Wenbo Li Feng Xue Rongshi Cheng |
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Institution: | (1) College of Material Science & Engineering, South China University of Technology, Guangzhou, 510641, China;(2) Key Laboratory of Mesoscopic Materials Science, College of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China |
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Abstract: | A poly(vinyl alcohol) hydrogel was prepared by coupling poly(vinyl alcohol) with epichlorohydrin as the cross-linking agent.
The structure of the hydrogel was characterized by FTIR and GPC techniques. Various amounts of water were added into the dry
gel to swell it, and the quantity of water in various states in the partially swollen hydrogel was determined by DSC technique.
The analytical results indicate that the water introduced into the dry gel first combines with the hydrophilic groups of the
network chains through hydrogen bond forming non-freezable water. The weight ratio of the non-freezable water to dry gel in
the hydrogels is about 0.20. After the non-freezable water is saturated, the additional water penetrates the network space
and exists simultaneously both in the freezable and free water states until reaching equilibrium swelling.
Translated from Acta Polymeric Sinica, 2006, (5): 671–675 (in Chinese) |
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Keywords: | hydrogel characterization DSC swelling |
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