【摘要】 通过沉淀聚合法制备了聚(N-异丙基丙烯酰胺-co-丙烯酸(P(NIPAM-co-AAc)微凝胶颗粒,继而在无水乙醇中使不同浓度的稀土离子Eu(Ⅲ)与P(NIPAM-co-AAc)微凝胶颗粒复配,制得了P(NIPAM-co-AAc)-Eu(Ⅲ)的复配颗粒。分别对P(NIPAM-co-AAc)微凝胶颗粒与P(NIPAM-co-AAc)-Eu(Ⅲ)的复配颗粒进行了扫描电子显微镜(SEM)、傅里叶红外光谱(FTIR)、荧光光谱(RF)以及紫外光谱(UV)表征,得到了所制微凝胶颗粒的形态、结构、荧光性能和温敏性能方面的相关信息。实验结果表明:聚(N-异丙基丙烯酰胺-co-丙烯酸)微凝胶颗粒平均粒径在365 nm左右,粒径分布均匀、形态较规则;P(NIPAM-co-AAc)-Eu(Ⅲ)的复配颗粒中,P(NIPAM-co-AAc)微凝胶颗粒和Eu(Ⅲ)之间能发生能量传递,可增强Eu离子的特征荧光发射和基体高分子的发射;微凝胶颗粒在复配后粒径变化不大,形态更加规则;具有明显的温敏性。更多还原

【Abstract】 In the present paper,the preparation and properties of Eu(Ⅲ) on poly(N-isopropylacrylamide-co-acrylic acid)(P(NIPAM-co-AAc)) were described.At first,P(NIPAM-co-AAc) microgel nanoparticles were prepared by the precipitation copolymerization of N-isopropylacrylamide with acrylic acid in the presence of N,N-methylenebisacrylamide in water.The morphology and size of the P(NIPAM-co-AAc) nanoparticles were characterized by the scanning electron microscope(SEM) method.The result of SEM shows that the sample is uniformly sized spherical particle and the average particle size of the P(NIPAM-co-AAc) is about 365 nm.Then,EuCl3 was chosen to interact with P(NIPAM-co-AAc) nanoparticles and formed the complex of P(NIPAM-co-AAc)-Eu(Ⅲ).The complex was characterized by Fourier transform infrared spectroscopy,ultraviolet-visible and fluorescence spectroscopy.It was found that the complex shows thermo-responsive fluorescence from the experimental results.There exists a energy transfer between the polymer ligand and the Eu(Ⅲ),which can enhance fluorescence emission of the polymer ligand and Eu(Ⅲ) at the same time.The LCST of P(NIPAM-co-AAc) containing Eu(Ⅲ) has changed little after the formation of the complex of P(NIPAM-co-AAc)-Eu(Ⅲ).Therefore,the complex can be used for developing the new applications in biomedical and fluorescence field.更多还原