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Swelling and Deswelling Behaviors of Thermosensitive Poly(N-isopropylacrylamide) Hydrogels with Different Crosslinking Densities  

Piao, Zhe Fan (Department of Organic Materials and Fiber Engineering, Soongsil University)
Ko, Jae-Hoon (Department of Organic Materials and Fiber Engineering, Soongsil University)
Kim, Young-Ho (Department of Organic Materials and Fiber Engineering, Soongsil University)
Publication Information
Textile Science and Engineering / v.44, no.3, 2007 , pp. 134-141 More about this Journal
Abstract
Poly(N-isopropylacrylamide)(PNIPAAm) hydrogels were synthesized via radical polymerization of N-iso-propylacrylamide in aqueous medium using ammonium persulfate and N,N'-methylenebisacrylamide (MBA) as an initiator and a crosslinking agent, respectively. PNIPAAm hydrogels exhibited a critical gel transition temperature (CGTT) at $32{\sim}34^{\circ}C$. Swelling and deswelling behaviors of the hydrogels with different crosslinking densities were analyzed by measuring swelling ratio below and above CGTT. The swelling ratio of the hydrogel below CGTT decreased with increasing MBA concentration, while that above CGTT increased. As MBA concentration increased, the micropore size decreased, however, the number of micropore increased slightly in the freeze-dried hydrogels swollen in water at $25^{\circ}C$ (below CGTT) before drying. The micropore became smaller and denser in the des deswollen state. The swelling ratio of the hydrogels decreased slightly with the repeated swelling and deswelling treatment.
Keywords
poly(N-isopropylacrylamide) (PNIPAAm); hydrogel; critical gel transition temperature (CGTT); swelling; deswelling; crosslinking density;
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