A series of crosslinkers(polyethylene glycol diacrylate

PEGDA) with different molecular weights were synthesized through end-capping of PEG by acryloyl chloride．The structures of the PEGDAs were characterized by FTIR．The water-absorbency of sodium polyacrylate crosslinked with PEGDAs was determined. In the experiments of water-swelling in deionized water

it was revealed that when the molecular weight of the crosslinker increased

the maximum of equilibrium water-absorbability of the synthesized superabsorbents was enhanced and the rate of water-swelling increased too

but the relative rate of water-swelling decreased．The relationship between the network structure of the superabsorbents and the water-absorbency was also discussed．Comparing PEGDA and MBA

the superabsorbents crosslinked with the former had much stronger water-absorbability

fewer residual monomers and less dissoluble linear polymers than the one crosslinked with the latter．