CMCS/PNIPA/粘土纳米复合水凝胶的结构与性能  

Structure and Property of Carboxymethyl Chitosan/Poly(N-Isopropyl Acrylamide)/Clay Nanocomposite Hydrogel

作　　者：马敬红[1] 许雅菁[1] 梁伯润[1] 

机构地区：[1]东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海200051

出　　处：《高分子材料科学与工程》2008年第5期64-67,共4页Polymer Materials Science & Engineering

摘　　要：以无机粘土作为交联剂制备了pH/温度双重响应的羧甲基壳聚糖/聚(N-异丙基丙烯酰胺)/粘土半互穿网络(CMCS/PNIPA/Clay semi-IPN)纳米复合水凝胶,对其结构、形态及溶胀行为等进行了研究。实验表明,无机粘土被剥离成纳米尺寸的片层,均匀分散在凝胶网络中,起交联剂的作用,CMCS以线性大分子存在于水凝胶中。CMCS/PNIPA/Clay纳米复合水凝胶在33℃出现体积相转变,与传统PNIPA凝胶一致;当pH值在CMCS的等电点附近时,凝胶的溶胀度出现最小值。A new kind of pH/temperature responsive semi-IPN nanocomposite hydrogel based on carboxymethylchitosan （CIVICS） and poly （N-isopropylacrylamide） （PNIPA） crosslinked by inorganic clay was prepared. The structure, morphology and swelling behaviors of these hydrogels were investigated. The results show that the inorganic clay is substantially exfoliated to the nano-dimension platelets which disperse homogeneously in the hydrogel and acts as a multifunctional crosslinker, and the CMCS linear chains incorporate in the hydrogels. The hydrogel exhibits a volume phase transition around 33 ℃, without significant deviation from the conventional PNIPA hydrogel. The minimum swelling ratios of the hydrogels are appeared near the isoelectric point of CMCS.

关 键 词：羧甲基壳聚糖 聚(N-异丙基丙烯酰胺) 无机粘土 半互穿网络 纳米复合水凝胶 

分 类 号：TB383[一般工业技术—材料科学与工程]