Synthesis And Properties Of Bonding-type Fluorescent Europium-containing Copolymers

Rare earth bonded fluorescent polymer has received enormous attention because this kind of functional materials not only possess unique fluorescence properties of rare earth ion, such as high fluorescence intensities, high colorimetric purity and high efficiency, but also has the special properties of polymer, such as light weight, chemical stability, and excellent processability. And due to their excellent performance, the functional polymer materials have broad application prospects in the field of photoluminescence materials, biological detection, and so on. In this paper, we use two preparation methods to synthesis the fluorescent copolymer, and characterize its structure and performance.A novel fluorescent complex was synthesized with acrylic acid (AA),1,10-phenanthroline (Phen) as ligand, and Eu3+as central ion. Afterwards, A series of fluorescent copolymer emulsions were prepared via soap-free emulsion polymerization, with methyl methacrylate (MMA), acrylamide (AM),4-vinylbenzenesulfonic acid sodium salt (NaSS) and Eu(AA)3Phen as monomer. The structure of the complex was characterized by elemental analysis, FT-IR and1H-NMR spectroscopy. The results indicated that the complexes were successfully prepared and a reasonable formula for the complex was Eu(AA)3Phen. TGA, XRD and fluorescence spectroscopy were employed to characterize the complex, and it was found that the complex has good thermal stability, crystal properties, and excellent fluorescent properties. In addition, the copolymer was characterized by FT-IR, and the results showed that copolymerization occurred among the monomers. The copolymer emulsion, which exhibited excellent stability, was characterized by various methods such as DLS, TEM and fluorescence spectroscopy. The results showed that the hydrodynamic diameters and distribution of micelles increased greatly with the amount of Eu(AA)3Phen added. Fluorescence spectroscopy analysis of copolymer emulsion indicated that the copolymer emulsion exhibited marked luminescence and the fluorescence intensity increased greatly with the contents of the complex.Polymerizable rare earth complex Eu (AA)(BA)2Phen, which had superior fluorescence properties, were prepared, with benzoic acid (BA), acrylic acid (AA) and1,10-phenanthroline (Phen) as ligand, and Eu3+as central ion. Elemental analysis, FT-IR, 1H-NMR analysis, TGA, XRD and fluorescence spectroscopy were employed to analysis the structure and property of the complex. The results showed that the complex was successfully synthesized; TGA analysis and fluorescence spectroscopy testing showed that the initial decomposition temperature of the complex had declined, but the complex had better fluorescence property. Afterwards, an amphipathic graft copolymer was prepared via solution polymerization, with macromonomer poly(ethylene glycol) methyl ether methacrylate (MPEGMA),2,2,3,4,4,4-hexafluorobutyl methacrylate (HFMA) and Eu(AA)(BA)2Phen. The structure of the copolymer was characterized by various methods such as FT-IR,1H-NMR,19F-NMR and GPC. The results suggested that the amphipathic graft copolymer was successfully prepared. Surface tension analysis of the copolymer showed that the copolymer could form micelle in the selective solvent. DLS and TEM analysis found that the size and distribution of the copolymer micelles increased with the copolymer concentration increases. Fluorescence spectroscopy analysis showed that the fluorescence intensity of the micelle solution increased with the concentration of copolymer added; and the micelle solution fluorescence intensity mutated in the critical micelle concentration of the micelle solution, which suggested that the critical micelle concentration could be determined through the change of fluorescence intensity.