Influence of Acrylamide on the Salt Resistance of Acrylic Superabsorbent Resin
The superabsorbent resin P(AA/AAS-co-AM)was prepared by aqueous solution polymerization of acrylic acid,sodium acrylate and acrylamide.The charge density,crosslinking density and hydrophilicity of the resin were measured and calculated by elemental analysis,rheometer,differential scanning calorimeter(DSC)and other characterization means.The relationship between the change of microstructure and change of salt resistance of the resin was studied,combined with the Flory water absorption theory.The effect of acrylamide on the salt resistance of acrylic superabsorbent resin was discussed.The results show that when the mass ratio of acrylic acid and acrylamide(m(AA)∶m(AM))changes from 10∶0 to 8∶2,the main factor affecting is the improvement of hydrophilicity with the swelling rate in 0.9％NaCl solution increased from 52.00 g/g to 78.86 g/g.When m(AA)∶m(AM)changes from 8∶2 to 6∶4,it is mainly affected by the decrease of charge density and increase of crosslinking density with the swelling rate decreasing from 78.86 g/g to 34.35 g/g.
acrylamidecharge densitycrosslink densityhydrophilicityFlory water absorption theorysalt tolerance
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