Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5210877 | Reactive and Functional Polymers | 2007 | 15 Pages |
Abstract
Stimuli-responsive poly(N-isopropylacrylamide-co-sodium acrylate) [poly(NIPAM-co-SA)] hydrogel networks were prepared by aqueous free-radical copolymerization using the ammonium persulfate/N,N,N1,N1-tetramethylethylenediamine (APS/TMEDA) redox-pair initiator system in the presence of different amounts of N,N1-methylenebisacrylamide (MBA) crosslinker. Higher swelling capacities were availed for these N-isopropylacrylamide-based hydrogels due to the presence of the hydrophilic poly(sodium acrylate) anionic units. In this the swelling phenomena of hydrogels in different surfactant and polymer solutions are investigated in a systematic way. The structural variation as well as the thermal stability of the surfactant-modified hydrogels were studied in detail. Further, the hydrogels swelling/diffusion kinetic parameters were investigated and a non-Fickian type of diffusion characteristics was found in all the swelling media for the diffusion of water into these hydrogels.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Y.M. Mohan, T. Premkumar, D.K. Joseph, K.E. Geckeler,