Abstract
Copolymers of hydroxyethyl acrylate (HEA), hydroxypropyl acrylate (HPA), hydroxyethyl methacrylate (HEMA) and hydroxypropyl methacrylate (HPMA) with styrene and with methyl methacrylate have been studied. Variations in nature and composition have been correlated, both with the total equilibrium water content of the resultant hydrogel and with the more detailed water binding behaviour as revealed by differential scanning calorimetry studies. Differential scanning calorimetry enables the relative proportions of non-freezing and freezing water to be determined and, in addition, enables the fine structure of the melting endotherm to be observed. Particular interest centres around the ability to produce hydrogels in which all freezing water has been eliminated by progressive incorporation of non-hydrophilic monomer or crosslinking agent (ethylene glycol dimethacrylate). Distinct differences are observed between hydrophilic acrylates and methacrylates in the relative effects of temperature on the equilibrium water contents of their respective copolymer series.
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