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Poly(N-isopropyl acrylamide)(PNIPAAm) and its copolymer hydrogels crosslinked withN,N'-methylenebisacrylamide(MBAAm) and poly(ethylene glycol) diacrylate(PEGDA) were prepared and their characteristics including swelling/deswelling behaviors were investigated. The hydrogel, with lower gelation rate and higher transmittance was prepared when PEGDA was used as a crosslinking agent. The volume phase transition temperature of PNIPAAm hydrogel was not affected seriously by the concentration of monomer and crosslinking agent, whereas, that of copolymer hydrogel was increased up to 5$0^{\circ}C$ by incorporating a small amount of SMA. In the case of copolymer hydrogel, higher volume phase transition temperature was obtained when PEGDA was used as a crosslinking agent, suggesting the chain length of the crosslinking agent has a significant effect on the volume phase transition temperature of P(NIPAAm-co-SMA) hydrogel. The pH dependence of the hydrogel was observed when PEGDA was used as a crosslinking agent as well as MBAAm. Larger pores were found at the surface of the hydrogel crosslinked with PEGDA, suggesting that the surface morphology has a close relation to the water contents and the volume phase transitions of PNIPAAm and P(N IPAAm-co-SMA) hydrogel.
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