Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Swelling and Deswelling Behaviors of Thermosensitive Poly(N-isopropylacrylamide) Hydrogels with Different Crosslinking Densities

가교도가 다른 열민감성 Poly(N-isopropylacrylamide) 수화겔의 팽윤 및 수축 거동

  • 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)
  • ;
  • 고재훈 (숭실대학교 유기신소재.파이버공학과) ;
  • 김영호 (숭실대학교 유기신소재.파이버공학과)
  • Published : 2007.06.30
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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

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