By means of γ‐irradiation 2‐hydroxyethyl methacrylate has been copolymerized in bulk with two different tetrafunctional monomers, ethylene glycol dimethacrylate and 1,3‐bis(acryloxymethyl) tetramethyl disiloxane and with a hexafunctional monomer, 1,1,1‐trimethylolpropane trimethacrylate. The resultant xerogels were subsequently swollen to equilibrium in water. In order to allow a comparison among the three crosslinkers, their molar masses and funtionalities were taken into account, the theoretical crosslink concentrations being varied from 0.032 to 0.644 mol dm ‐3 . The relative hydrophobicity of the three crosslinkers was found to have a significant effect on both the equilibrium swelling and elastic modulus of the swollen gels. Non‐freezing water in several gels crosslinked with 1,1,1‐trimethylolpropane trimethacrylate was analysed by differential scanning calorimetry (DSC). The proportion of non‐freezing water in the gel relative to the overall water content was found to increase with increasing crosslink density.
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Davis et al. (1991) studied this question.
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