聚(N-异丙基丙烯酰胺)/海藻酸钠/黏土复合水凝胶的制备及其性能

Preparation and characterization of sodium alginate/poly(N-isopropylacrylamide)/clay composite hydrogel

以无机黏土为交联剂制备了聚(N-异丙基丙烯酰胺)/海藻酸钠/黏土(PINPA/SA/clay)复合水凝胶,通过红外光谱、X射线衍射和SEM对凝胶的结构和形态进行了表征,并研究了凝胶的溶胀动力学和力学性能。结果表明:黏土的结晶结构已被破坏,黏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;随黏土含量的增加,凝胶网络交联密度增加,孔洞的孔径减小,溶胀速度下降。另外,PINPA/SA/clay凝胶显示了良好的力学性能,断裂伸长率超过1000%。

A new kind of composite hydrogel based on Sodium Alginate （SA） and poly （N-isopropylacrylamide） （PNIPA） cross-linked by inorganic clay （Laponite XLG） was synthesized. The structure and morphology were characterized by means of FT-IR, XRD and SEM. Swelling behavior and mechanical properties of these novel hydrogels were also studied. The results showed that 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 and the pore size decreased, which led to the decrease of the swelling rates of the hydrogels. Moreover, the PINPA/SA/clay hydrogels exhibited good mechanical properties with the elongation at break more than 1000%.