以羟乙基纤维素为骨架的环境敏感共聚物的合成及性能研究

Synthesis and properties of environmental sensitive graft copolymer based on hydroxyethyl cellulose

通过铈离子在酸性条件下氧化还原引发,成功得到了以羟乙基纤维素(HEC)为主链,以聚甲基丙烯酸N,N-二甲氨基乙酯(PDMAEMA)为支链的接枝共聚物,利用红外、核磁对产物进行了结构表征;探讨了接枝聚合的反应机理;利用旋转流变仪对该共聚物的水溶液做了粘温曲线测试,对它的最低临界转变温度(LCST)进行了观察;通过透射电镜照片初步研究了接枝产物在不同pH值和不同外加盐浓度下的自组装行为。

The graft copolymerization of hydroxyethyl cellulose （HEC） and N, N-dimethylamino ethyl methacrylate（DMAEMA） was initiated by cerium （IV） ammonium nitrate （CAN）/HCI. The final graft copolymer was characterized by FT-IR spectrum and 1H-NMR spectrum, and the possible mechanism of the copolymerization was researched. Rheological measurement was used to research LCST. The effect of pH and salt concentration on the self-assembly behavior of the copolymer were also studied.