Abstract:

3,5-Dinitro salicylic acid Eu(Ⅲ) complex(EuDNS) and its polymer composites were synthesized. The complex and polymers were characterized by elemental analysis, IR, UV-Vis methods. Effects of the complex content and polymer materials on the fluorescence property were studied. The complex may form a chelate heterocyclic structure and result in a wide UV-Vis absorption band that is well matched to excited wavelength, so that the complex can emit strong characteristic red luminescence of Eu(Ⅲ) ion. Even if the mass fraction of complex is 0.25%, EuDNS/PMMA(PMMA:polymethyl-methacrylate) polymer has still very strong fluorescence property. The order of the emission from strong to weak for the copolymers is:P(MMA-co-St)＞PMMA＞P(MMA-co-AA)(AA:acrylic acid). The acrylic acid comonomer can quench luminescence. The results show the inhibition and retardation effects of the complex on free radical copolymerization of styrene/methyl methacrylate initiated with azobisisbutyronitrile at 60 ℃, and the inhibition effect increases with the increasing styrene(St) comonomer content, whereas P(MMA-co-St) transparence decreases. The EuDNS/PMMA polymer has a longer apparent fluorescent lifetime than the corresponding complex.

Key words: dinitrosalicylic acid, rare earth europium, complex, luminescence