基于超支化聚合物两性水凝胶的制备及性能  

Synthesis and Characterization of Polyampholyte Hydrogels Based on Hyperbranched Polymer

作　　者：王海卫[1,2] 梁学称 徐昆[1] 谭颖[1] 路璀阁[1] 王丕新[1] 

机构地区：[1]中国科学院长春应用化学研究所,生态环境高分子材料重点实验室,长春130022 [2]中国科学院大学,北京100049

出　　处：《高等学校化学学报》2016年第4期752-760,共9页Chemical Journal of Chinese Universities

基　　金：吉林省科技发展计划项目(批准号:20140204083GX,20140204064SF,20140307007GX);长春市科技发展计划项目(批准号:14KG050);中国科学院科技合作专项资金资助项目(批准号:2014SYHZ0021);中国科学院科技服务网络计划(批准号:KFJEW-STS-048)资助

摘　　要：通过N-丙烯酰-1,2-乙二胺盐酸盐(ADE)的Michael加成反应制备阳离子超支化低聚物聚N-丙烯酰-1,2-乙二胺盐酸盐(HADE),以HADE为大分子单体,以丙烯酰胺(AAm)和丙烯酸(AAc)为单体,在无需外加有机交联剂的条件下制备具有高机械强度的两性聚电解质水凝胶(HAH凝胶).结果表明,HAH凝胶可以被压缩超过99%的形变而不断裂,压缩强度高达61.2 MPa;HAH凝胶的断裂伸长率和断裂强度分别达到1700%和70.2 k Pa.由于HADE末端伯胺基与强氧化引发剂通过氧化还原反应生成胺自由基和自身结构中的双键同时参与聚合反应,因而为凝胶网络形成提供了必要的化学交联作用.同时HADE结构中胺基正电荷与AAc的羧基负电荷之间的离子交联也为凝胶网络提供了物理交联作用.2种交联作用的协同作用是HAH凝胶具有良好机械性能的根本原因.The cationic hyperbranched oligomer poly（ N-acryloyl-1,2-diaminoethane hydrochloride）（ HADE）was firstly synthesized by Michael addition reaction. And then,polyampholyte hydrogels（ HAH gels） with good mechanical strength were prepared with HADE as macromonomer,acrylamide（ AAm） and acrylic acid（ AAc） as comonomers in the absence of chemical crosslinking agent. The results of mechanical testing showed that HAH gels could sustain compressive strain of 99% without breaking and the optimized compressive strength was up to 61. 2 MPa. And they also could be stretched over 1700% and tensile strength was 70. 2 k Pa in tensile test. During the fabrication of HAH gels,amino free radicals derived from the oxidation-reduction reaction between amino groups of HADE and oxidation initiator and double bonds on the end of HADE could simultaneously participate in copolymerization with AAm and AAc. Therefore,HADE could be considered as a chemical cross-linking agent. Meanwhile,physical cross-linking action originated from static-electronic interaction between cationic amino groups of HADE and anionic carboxyl groups of AAc could also improve the mechanical performance of HAH gels. Thus,HAH gels could exhibit excellent mechanical performance due to the synergetic effect of chemical and physical cross-linking action.

关 键 词：超支化聚合物 两性聚电解质水凝胶 优良机械性能 P H敏感 

分 类 号：O631.2[理学—高分子化学]