物理/化学复合交联水凝胶的结构形态和温敏性  

Structure,Morphology and Temperature-Sensitivity of Hydrogel Cross-Linked by Both Physical and Chemical Cross-Linker

作　　者：张青松[1] 赵义平[1] 张龙柏[1] 李洪春[1] 陈莉[1] 

机构地区：[1]天津工业大学天津市改性与功能纤维重点实验室,材料科学工程学院,天津300160

出　　处：《高分子材料科学与工程》2010年第9期80-83,88,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(20774064);教育部科学技术研究重点项目(209005)

摘　　要：以等质量的物理交联剂锂皂石(hectorite)和化学交联剂亚甲基双丙烯酰胺(MBA)共同作为交联剂制备了聚异丙基丙烯酰胺水凝胶。该复合交联剂改善了仅用MBA交联制备的水凝胶的脆性和透光性,储能模量(E′)约为单独使用亚甲基双丙烯酰胺(MBA)和hectorite制备的水凝胶的储能模量之和的一半,体积相转变温度(VPTT)仍在32℃左右,和单独使用MBA和hectorite制备的水凝胶的VPTT相一致,但内部形态和溶胀度更多地取决于化学交联剂MBA的使用。Physical cross-linker hectorite and chemical cross-linker N,N＇-methylene-bis-acrylamide（MBA） with same mass were used together to prepare poly（N-isopropylacrylamide） hydrogel. The brittleness and poor transmittance of hydrogel simply using MBA as cross-linker were improved by multiple adoption of both hectorite and MBA. The storage modulus of hydrogel using both cross-linkers is half total storage modulus of hydrogels cross-linked by MBA and hectorite. In addition,the volume phase transition temperature（VPTT） of multi-cross-linked hydrogel keeps at 32 ℃ or so,which is consistent with the hydrogels by using hectorite or MBA as exclusive cross-linker. More importantly,the interior shape and swelling ratio mainly depend on the adoption of chemical cross-linker MBA.

关 键 词：水凝胶 锂皂石 亚甲基双丙烯酰胺 异丙基丙烯酰胺 体积相转变温度 

分 类 号：TQ427.26[化学工程]