聚（N-异丙基丙烯酰胺）／海藻酸钠／粘土复合水凝胶的制备及溶胀动力学研究

以无机粘土为交联剂制备了聚（N-异丙基丙烯酰胺）／海藻酸钠／粘土（PINPA／SA／Clay）复合水凝胶，通过红外光谱、X射线衍射对凝胶的结构进行了表征，结果表明：粘土的结晶结构已被破坏，粘土规整的片层被剥离并在凝胶中无序分布，起到交联剂的作用；随粘土含量的增加，凝胶网络交联密度增加，溶胀速度下降。在不同温度下对不同粘土含量的凝胶进行了溶胀动力学测试，表明在低于其相转变温度时，凝胶的扩散类型为non－Fickian扩散。

Study on the preparation and the swelling kinetics of Poly (N-isopropylacrylamide)/ Sodium Alginate /Clay Composite Hydrogel

A new kind of composite hydrogel based on the Sodium Alginate(SA) and Poly(N-isopropylacrylamide) (PNIPA) cross-linked by inorganic clay was successfully synthesized.The structures of the hydrogels were characterized by means of FT-IR and XRD.The results show the regular crystal structures of clay were destroyed and the clay platelets were exfoliated and dispersed randomly in the hydrogels,which acted as a multifunctional crosslinker in the hydrogels. As the clay contents increased,the crosslinking density of hydrogel increased,which led to the decreasing of the swelling rates of the hydrogels.The swelling kinetics of PINPA/SA/Clay hydrogel with different clay contents were studied at the different temperature.The transport mechanism of PINPA/SA/Clay hydrogel below its LCST is non-Fickian transport.