Abstract
A two-step polymerization technique is introduced to synthesize polyacrylamide/polyacrylate interpenetrating network (PAM/PAC IPN) hydrogels. The swelling ratio of the IPN hydrogel increases with the increase of the PAC content in PAM/PAC, and is smaller than the traditional PAM or PAC superabsorbents. A non-Fickian mechanism is observed in the swelling process, and the swelling changes from non-Fickian mechanism to Fickian mechanism with the increase of polyacrylate dosage in the hydrogel. The IPN hydrogel has typical pH-sensitivity and on–off effect. The deswelling properties and methyl orange dye removal are carried out based on the chelation of the carboxylic/carboxylate groups on the hydrogels with multivalent cations in solution. The hydrogel is expected to be used in the removal of heavy metal ions and dyes.
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Acknowledgements
The authors thank for joint support by the National Natural Science Foundation of China (No. 50572030 and No. 50372022) and the Key Scientific Technology Program of Fujian, China (No. 2005HZ01-4 and No. 2004HZ01-3).
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Tang, Q., Wu, J., Lin, J. et al. Two-step synthesis of polyacrylamide/polyacrylate interpenetrating network hydrogels and its swelling/deswelling properties. J Mater Sci 43, 5884–5890 (2008). https://doi.org/10.1007/s10853-008-2857-x
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DOI: https://doi.org/10.1007/s10853-008-2857-x