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Hydrophilic sponges based on 2-hydroxyethyl methacrylate. V. effect of crosslinking agent reactivity on mechanical properties

✍ Scribed by Clayton, Anthony B.; Chirila, Traian V.; Lou, Xia

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 265 KB
Volume: 44
Category: Article
ISSN: 0959-8103
DOI: 10.1002/(sici)1097-0126(199710)44:2<201::aid-pi846>3.0.co;2-b

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✦ Synopsis

Tensile properties of poly(2-hydroxyethylmethacrylate) (PHEMA) sponges crosslinked with divinyl glycol (DVG) and ethylene glycol dimethacrylate (EDMA), two crosslinking agents having very di †erent hydrophilicity and reactivity, were compared. Crosslinking agent concentrations were varied from 0É5 to 5É0 mol%, at a Ðxed 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)Èstrain measurements was not possible because of the non-linear response of the sponges to compressive strains.

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