多重响应性聚（N-乙烯基己内酰胺）复合水凝胶材料制备和相变机理研究

This application is aimed to start a detailed study on the mechanism of the phase transition behavior of poly(vinylcaprolactam)/Graphene composite : .to prepare well dispersible PVCL/GO bulk hydrogel and to study the influence of GO content, temperature, pH,near infrared light on the property of the PVCL hydrogel with the help of the advanced spectroscopic techniques such as two dimensional correlation spectroscopy and moving window technique;..Using "Graft-to" methode to prepare thermal sensitive core-shell PVCL/GOD nano composite based on modified GOD and monodispersible PVCL using living polymerization methodes such as ATRP or RAFT, and to study the influence of temperature and pH on the fluorescence intensity of GOD;..Another approach for the preparation of thermoresponsive hybrid systems makes use of electrostatic interactions in order to cover charged microgels with oppositely charged nanoparticles。 We will use this methode to prepare a type of PVCL/GOD composite nanogel based on modified GOD and PVCL gel prepared from Precipitation polymerization.

本项目拟就PVCL/石墨烯纳米复合材料展开研究：1以PVCL水凝胶为基体，合成分散性良好的PVCL/GO复合本体水凝胶，同时试图探讨GO的含量、温度、pH、近红外光等因素对PVCL水凝胶性能的影响，并着重利用二维相关谱及外扰相关移动窗口等谱学手段探讨GO的引入对PVCL水凝胶温度响应性的影响，以揭示GO与PVCL的内在相互作用机制；2利用ATRP或RAFT等活性聚合方法合成单分散PVCL，并将之接枝在改性后的石墨烯量子点（GQD）上，以制得温敏性的核壳型PVCL/GQD纳米复合材料，并探讨温度、pH等因素对GQD荧光强度的影响；3 利用沉淀聚合法合成PVCL共聚物微凝胶，通过合理改性将GQD吸附在PVCL微凝胶上，以制得附着型PVCL/GQD纳米复合微凝胶。

本项目执行期间，我们主要运用二维相关光谱和移动窗技术（PCMW）两种先进表征手段对聚乙烯基己内酰胺（PVCL）及其复杂体系（离子液体、共聚、共混、微凝胶）的相变行为进行了系统研究。核心工作列举如下.1）离子液体的存在对PVCL水溶液相变行为的影响.2）PVCL与其它温敏聚合物的共混、共聚体系水溶的相变行为.3）PVCL微凝胶体系