Abstract
Tensile properties of poly(2-hydroxyethylmethacrylate) (PHEMA) sponges crosslinked with divinyl glycol (DVG) and ethylene glycol dimethacrylate (EDMA), two crosslinking agents having very different hydrophilicity and reactivity, were compared. Crosslinking agent concentrations were varied from 0·5 to 5·0 mol%, at a fixed water content of 80 wt% in the monomer mixture. The poorer tensile properties of EDMA-crosslinked sponges were attributed to network inhomogeneities, which were presumed to arise from the formation of rigid crosslinks within the phase-separated droplets. Comparison of the crosslinking efficiencies of DVG and EDMA via stress (compression)–strain measurements was not possible because of the non-linear response of the sponges to compressive strains. ©1997 SCI
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