Journal
JOURNAL OF MATERIALS SCIENCE
Volume 43, Issue 17, Pages 5884-5890Publisher
SPRINGER
DOI: 10.1007/s10853-008-2857-x
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Funding
- National Natural Science Foundation of China [50572030, 50372022]
- Key Scientific Technology Program of Fujian, China [2005HZ01-4, 2004HZ01-3]
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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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