Five series of polymeric hydmgds based on 2-hydroxyethyl methacrylate (HEMA) of 90 wt％ and a macromolecuiar cmsslinker— E-51 dimethacrylate (E-51-DMA) of 10 wt％ were prepared by bulk copolymerization

crosslinked with N

N'-methylene-bisacrylamide (MBA)

divinyl benzene (DVB)

ethylene dimethacrylate (EDMA)

1

1

1-triacryloxymethyl propane (TAP) and 2

2

2-triaeryloxymethyl ethanol (TAE)

respectively The effect of the species and content of erosslinkers on swelling properties

Young’s modulus

effective crosslinking density(ve) and polymer-water interaction parameter(χ) were studied

and cmsslinking efficiencies of various crosslinkers were also compared．As the amounts of cmsslinkers increased

a large number of emsslinks will be generated wihtin hydmgels

so the equilibrium water content (EWC) decreased

in contrast

the volume fraction of polymer in hydrogels (φ2) increased．As a result

the enhancement of effective crosslink density (ve) concerning network structures and interaction parameter(χ) that represents thermodynamic interaction between water and polymers could be observed．The erosslinking efficiencies of five adoptive cmsslinkers in E-51-DMA10/HEMA90 hydmgel systems were fitted from the relationships between effective crosslink density and theoretical crosslink density．and their order was as follows DVB>EDMA>TAE>MBA≈TAP The changing magnitudes for these above-mentioned parameters may be attributed to the nature of crosslinkers and their emsslinking efficiencies．