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Studies on Preparation and Properties of Rare Earth Polyurethane-acrylate Material with Photolum Inescence Property

Author: MaSongTao
Tutor: FangShaoMing
School: Zhengzhou University of Light Industry
Course: Materials Science
Keywords: Photoluminescence Rare earth complexes Doping Bonding Rare Earth polyurethane
CLC: O631.3
Type: Master's thesis
Year: 2010
Downloads: 83
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Abstract


Acrylic polyurethane (PUA) materials with wear, abrasion resistant, high temperature resistance, good toughness, high transparency, high-precision, etc., in the field of materials has been a wide range of applications. Because of its unique molecular structure and controllable polymerization, and finally can achieve functional material. Rare earth elements have unique electronic structure, the electronic energy levels, decided its better fluorescence properties or magnetic properties. However, the rare earth ions are present the problem of low luminous efficiency, in order to solve this problem, select high Absorptivities organic ligand. This high absorptivity of the organic ligand lanthanide complexes formed with rare earth ions, the effective delivery of light energy can be absorbed to the rare earth ions, so that the characteristic fluorescence of rare earth ions enhanced, thereby improving the light emitting efficiency of the rare earth ions. This organic lanthanide complexes has become an important class of fluorescent material. In this thesis acrylic polyurethane material as a substrate doping law and key legal two ways to prepare rare earth polyurethane material. (1) were prepared by high-temperature hydrothermal method lanthanide complexes [Tb (L 1 ) (phen)] ∞ , and the crystal structure by the line parsing, where L the 1 : 5 - hydroxyl between phthalate anionic ligands, phen: phenanthroline. The complexes with acrylic polyurethane monomer directly doping after the cure obtained rare earth TbIII complex / acrylic polyurethane green fluorescent material, the composite thermal properties, mechanical properties, fluorescence properties, and dynamic mechanical properties were characterized. The research shows that: under 399 nm excitation light irradiation, the composite material has good green fluorescent properties, and with the increase of the rare earth element content, fluorescence performance enhancements, when the rare earth content increased to 7%, the material still has a strong green fluorescence, did not appear the phenomenon of fluorescence quenching; improve the heat resistance of the material; rare earth content increases the mechanical properties of the material; glass transition temperature increased and then decreased with the improvement of the rare earth content, when the RE content reached 1.5%, the glass transition temperature is maximized. (2) rare earth complexes were prepared by high temperature hydrothermal method [Dy 2 (L 2 ) 3 (H 2 O) 4 ] ∞, wherein the L 2 : 2,6 - dihydroxy isonicotinic anionic ligand, and parse the crystal structure. The complexes directly doped with acrylic polyurethane, the preparation of the rare earth DyIII complexes / acrylic acid ester-based polyurethane composites, and thermodynamic properties of the composite material, the internal structure, fluorescence properties were characterized. The results show that: the complex in the matrix at 200 for 8 00 nm particles uniformly dispersed; This material has good thermal stability, under the excitation wavelength of 469 nm excitation, the emission spectrum at 515 nm fluorescence intensity reached and with the increased content of rare earth complexes, the fluorescence intensity continuously enhance does not appear the phenomenon of fluorescence quenching. (3) the one with reactive functional groups (hydroxy) lanthanide complexes synthesized by in vitro diffusion method, the complex chemical formula: {[Sm (L 3 ) 3 (phen)] 2 (dmpy) (C 2 H 5 OH) 2 (H 2 O) 2 } ∞ , where L 3 : hydroxyphenyl acrylate based anionic ligands dmpy: 2 6 - lutidine. The complexes with acrylic polyurethane macromonomer bonding system was rare earth SmIII complexes / PUA composite, and study the impact of different rare earth complexes content on the thermal stability of the composite material, fluorescent properties and mechanical properties. Do another comparison test, in order to improve the light transmittance of the material, the introduction of the universal solvent-DMF. The first complex was dissolved in DMF and then doped into the substrate which. The performance difference of contrast material prepared by two different methods. The results show that: the composite material prepared in the second group of the Comparative Test than the first set of tests was prepared out of the light transmittance of the composite material was significantly improved, and no effect on the fluorescent effect of the material, however, the thermodynamic properties of the material is decreased. (4) 5 - amino acid as the ligand, through in vitro diffusion method, preparation of a europium complex {of [Eu (H 2 L 4 ) 2 (H 2 O) 5 ] (H 4 L 4 ) } ∞, the use of the complexes of the amino group as a reactive group was prepared through the large monomers technology, a new bond-type acrylic urethane photoluminescence fluorescence, heat and weight and other properties of the material, and the material was tested . The study showed that: send a strong characteristic fluorescence at 616 nm excitation wavelength of 349 nm, the rare earth complexes and luminescent materials. Even when the rare earth complexes containing 8%, still no occurrence of the phenomenon of fluorescence quenching. With increasing the content of the rare-earth complexes, the composite extrapolation starting thermal degradation temperature of the relatively pure PUA material is gradually increased.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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