Fluorescence Studies on Thermo-responsive Behavior and Microenvironment of Poly(N-alkylacrylamide) Gels

9-（4-N， N-二甲氨基苯基）菲（DMA-Phen； DP）中N， N-二甲苯胺（DMA）和菲（Phen）通过单键直接连接，表现出强烈的无结构的分子内电荷转移（ICT）荧光。由于DP具有较强的溶剂致色性，我们对其作为一种新型荧光探针很感兴趣，并利用DP作为分子内荧光探针研究了聚合物微环境。本项目采用荧光探针技术研究了丙烯酰胺衍生物制备的水凝胶的温度诱导体积相变及其微环境。本研究的结果如下：1。在不同的实验条件下制备了dp标记的聚n -异丙基丙烯酰胺（PNIPAM）水凝胶，并利用荧光探针技术研究了其温度诱导的相变和微环境。制备了几种dp标记的丙烯酰胺聚合物凝胶（PNIPAM）、聚（N， N-二乙基丙烯酰胺）（PDEAM）、聚（N-异丙基甲基丙烯酰胺）（PNIPMAM）和聚（N， N-二甲基丙烯酰胺）（PDMAM），并对它们的温度诱导相变和微环境进行了比较。制备了甲基丙烯酸甲酯、DMAM、n- n-丙基丙烯酰胺和NIPAM的dp标记NIPAM共聚物水凝胶。对共聚物凝胶的热响应行为和微环境进行了比较。

9-(4-N, N-Dimethylaminophenyl)phenanthrene (DMA-Phen ; DP), in which N, N-dimethylaniline (DMA) and phenanthrene (Phen) are linked directly by a single bond, shows an intense and structureless intramolecular charge-transfer (ICT) fluorescence. We have been interested in this compound DP as a new florescence probe because of its strong solvatochromism and have studied polymer microenvironments with using DP as an intramolecular fluorescence probe. In this project temperature-induced volume phase transitions of hydrogels prepared from acrylamide derivatives and their microenvironments have been studied by using the fluorescence probe technique. The results in this study are as follows.1.DP-labeled poly(N-isopropylacrylamide)(PNIPAM) hydrogels were prepared under various experimental conditions and temperature-induced phase transitions and microenvironments of them were studied by fluorescence probe technique.2.Some DP-labeled acrylamide polymer gels such as PNIPAM, poly(N, N-diethylacrylamide)(PDEAM), poly(N-isopropylmethacrylamide) (PNIPMAM), and poly(N, N-dimethylacrylamide) (PDMAM), were prepared and their temperature-induced phase transitions and microenvironments were compared with each other.3.DP-labeled NIPAM copolymer hydrogels with methyl methacrylate, DMAM, N-n-propylacrylamide, and NIPMAM were prepared. Thermo-responsive behaviors and microenvironments of copolymer gels were compared with each other.