多功能两亲梳状聚合物的合成及包覆荧光量子点  

SYNTHESIS OF A MULTIFUNCTIONAL COMB-TYPE AMPHIPHILIC POLYMER AND ITS USE FOR ENCAPSULATING LUMINESCENT QUANTUM DOTS

作　　者：吴战宇[1] 撒宗朋[1] 邱芳萍[2] 赵义丽[1] 李亚鹏[1] 王书唯[1] 王静媛[1] 

机构地区：[1]吉林大学化学学院麦克德尔米得实验室,长春130023 [2]长春工业大学化学与生命科学学院,长春130012

出　　处：《高分子学报》2010年第5期516-521,共6页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号20574028);吉林省科技厅青年基金(基金号20080119)资助项目

摘　　要：利用溶液聚合和成酰胺反应合成了多功能梳状两亲性共聚物,聚(甲基丙烯酸-co-甲基丙烯酸十八酯)-(乙醇胺-乙二胺叶酸)(PSM-EE-FA).用红外光谱(FTIR),核磁共振(1H-NMR)及凝胶渗透色谱(GPC)表征了该聚合物的结构及分子量分布.实验结果证明合成了该聚合物,其数均分子量(Mn)为28600,多分散性为1.375.用该两亲梳状聚合物包覆油溶性CdSe/ZnS量子点,通过相转移作用,得到水溶性靶向量子点(PSM-EE-FA-QDs).该水溶性量子点溶液具有较好的稳定性.通过紫外-可见(UV-Vis)及荧光发射光谱分析对该量子点的光学性质进行研究.结果表明,PSM-EE-FA-QDs的紫外-可见光谱及荧光发射光谱峰形与原量子点基本一致.由于量子点表面聚合物层的形成,峰位发生少量红移.该量子点水溶液的荧光强度是原量子点氯仿溶液的98%,荧光产率是原量子点氯仿溶液的95%.动态光散射(DLS)及透射电镜(TEM)测试结果表明水溶性量子点分布均匀.合成的水溶性量子点不但光学性能稳定,而且聚合物及水溶性量子点的合成方法较为简便.Solution polymerization and amidation reaction were used to synthesize the multifunctional combtype amphiphilic polymer,poly（stearyl methacrylate-co-methylacrylic acid）-（ethanolamine-ethanediamine-folic acid） （ PSM-EE-FA ）. A study on structure and configurations was conducted through Fourier transform infrared spectroscopy （FTIR） and nuclear magnetic resonance （1↑H-NMR）. The molecular weight distribution was determined by gel-permeation chromatograpy （ GPC ）. It was found that the polymer was synthesized successfully,and that the number-average molar mass and the polydispersity index were 28600 and 1. 375 respectively. Through the phase transfer process,the amphiphilic polymer was used to encapsulate hydrophobic CdSe /ZnS core-shell quantum dots （ QDs） in chloroform to get water-soluble,targeting quantum dots （ PSM-EE-FA-QDs）. The water-soluble QDs solution was stable. The optical properties of PSM-QDs were determined by ultraviolet-visible （UV-Vis） and fluorescence emission spectrum. As shown in the results,the UV-Vis and fluorescence emission peaks were similar to those of the original hydrophobic QDs. However,because of the formation of the polymer layer on the surface of the QDs,the red-shifts of the peaks were observed. The resulting PSM-EE-FA-QDs retained 98% of the photoluminescence value of the original CdSe /ZnS QDs in chloroform. The quantum yield （QY） of the PSM-EE-FA-QDs was 95% of the original QDs. With the dynamic light scattering （DLS） and transmission electron microscopy （ TEM） results,it was indicated that the water-soluble QDs were well-dispersed within the polymer. In addition to good performance of PSM-EE-FA-QDs,the synthesis of the copolymer and the corresponding water-soluble QDs is relatively simple.

关 键 词：多功能 梳状 两亲 量子点 水溶 

分 类 号：O631.3[理学—高分子化学]