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Velume Phase Transition of Poly (N-isopropylacrylamide-co-sodium methacrylate) Hydrogel Crosslinked with Poly(ethylene glycol) diacrylate  

김선아 (경북대학교 공과대학 염색공학과)
한영아 (경북대학교 공과대학 염색공학과)
손성옥 (경북대학교 공과대학 염색공학과)
지병철 (경북대학교 공과대학 염색공학과)
Publication Information
Polymer(Korea) / v.26, no.5, 2002 , pp. 653-660 More about this Journal
Abstract
The volume phase transition of poly(N-isopropylacrylamide) (PNIPAAm) and poly (N-isopropylacrylamide-co-sodium methacrylate) (P (NIPAAm-co-SMA)) hydrogels crosslinked with poly (ethylene glycol) diacrylate (PEGDA) was investigated in consideration of water content and surface area. The volume phase transition temperature of hydrogel was not affected by the concentration of crosslinking agent, which increased over 40$\^{C}$ by incorporating a small amount of SMA. Higher volume phase transition temperature was obtained when PEGAD was used as a crosslinking agent, suggesting that the chain length of crosslinking agent had a significant effect on the volume phase transition temperature. The surface area of PNIPAAm and P (NIPAAm-co-SMA) gels fell off around the volume phase transition temperature, resulting from the fact that the size of pores reduced remarkably in the course of the volume phase transition. Hence, the surface area and the pore size were considered to be important factors indicating the volume phase transition.
Keywords
volume phase; transition; P(NIPAAm-co-SMA); PEGDA; water content; surface area;
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