无皂乳液聚合制备含铕荧光共聚物乳液的研究及其表征

PREPARATION AND CHARACTERIZATION OF FLUORESCENT COPOLYMER EMULSION CONTAINING EUROPIUM BY SOAP-FREE EMULSION POLYMERIZATION

以丙烯酸(AA)为第一配体、邻菲罗啉(Phen)为第二配体、Eu3+为中心离子,合成了一种可聚合的稀土铕配合物.以配合物单体、甲基丙烯酸甲酯、丙烯酰胺和对苯乙烯磺酸钠为共聚单体,通过无皂乳液聚合的方法,制备了含铕荧光共聚物乳液.采用红外光谱对共聚物的结构进行了表征,并探讨了配合物单体含量对共聚物乳液性能的影响.透射电子显微镜(TEM)和激光光散射粒度仪(PCS)测试结果表明,共聚物乳液形成了相对均一的球状结构,但随着配合物单体含量增加,共聚物微球粒径逐渐增大、分散性变差.采用荧光分光光度计测试了共聚物乳液的荧光性能,在594和619 nm处出现Eu3+的特征发射光谱,且荧光强度随着配合物单体含量增加而增强.

A novel fluorescent complex was synthesized with Eu3＋,acrylic acid（AA） and 1,10-phenanthroline（Phen）,using absolute ethyl alcohol as solvent.The chemical structure and fluorescent property of the complex were characterized by elemental analysis,FTIR,1H-NMR spectroscopy and fluorescence spectroscopy.The results indicted that the fluorescent complex Eu（AA）3Phen was successfully prepared and had an excellent fluorescence property.Afterwards,a series of novel fluorescent copolymer emulsions were prepared via soap-free emulsion polymerization,with methyl methacrylate（MMA） and acrylamide（AM） as main monomers,Eu（AA）3Phen as functional monomer and 4-vinylbenzenesulfonic acid sodium salt（NaSS） as polymerizable emulsifier.The structures of the copolymers were characterized by FTIR.The results revealed that copolymerization occurred among MMA,AM,NaSS and Eu（AA）3Phen,and the copolymers were prepared successfully.The influences of the dosages of Eu（AA）3Phen on the stability of copolymer emulsions were studied by the technique of centrifugation,indicating that the emulsions had excellent stability.The average particle size and distribution were measured by photon correlation spectroscopy（PCS）,and the result showed that the hydrodynamic diameters and distribution of micelles both increased gradually with the contents of Eu（AA）3Phen.The morphology of latex particles were examined by transmission electron microscopy（TEM）,and the images showed that the particles were sphere-shaped,whose size was in good agreement with the measurement results from PCS.In addition,the emulsions were characterized by fluorescence spectroscopy,and it was found that copolymer emulsions exhibited marked luminescence at the wavelength of 594 and 619 nm.More importantly,the fluorescence intensity increased gradually with the contents of Eu（AA）3Phen in the copolymers.