羧酸类大分子稀土配合物的合成、表征及性能研究

通过先聚合再配合的方法成功制备了两种羧酸类大分子稀土铕配合物PAA-Eu和ST-AA-Eu,并将其与合成的小分子稀土配合物Eu(AA)3形成对比。经红外光谱初步表征发现稀土配合物已经配位成功且其配位数为6。分别采用凝胶渗透色谱(GPC)和等离子发射光谱(ICP)分析大分子稀土配合物的分子量与稀土铕的含量。由TG分析配合物的分解温度并了解其热稳定性能和组分,采用荧光激发发射光谱研究其荧光性能,采用SEM分析配合物与基质的相容性。结果表明,大分子稀土配合物的热稳定性稍差于小分子稀土配合物,其中ST-AA-Eu由于苯环的介入热稳定性能稍好。小分子稀土配合物Eu(AA)3的荧光强度明显要比大分子稀土配合物强,大分子稀土配合物PAA-Eu的荧光强度比ST-AA-Eu强,配合物都发红光;大分子稀土配合物与基质的相容性比小分子稀土配合物好。     

多元苯甲酸铕配合物的合成及其荧光性能研究

分别合成了Eu3+-苯甲酸(BA)-丙烯酸(AA)和Eu3+-苯甲酸(BA)-丙烯酸(AA)-邻菲罗啉(phen)有机稀土配合物,通过元素分析、红外光谱和紫外光谱确定了它们的结构式分别为Eu3+(BA)2(AA)和Eu3+(BA)2(AA)(phen),同时研究了样品的荧光性和热性能,荧光光谱表明样品引入邻菲罗啉后,荧光强度和荧光单色性大大提高,热分析表明该配合物具有优异的热稳定性.     

铕配合物对胶印荧光防伪油墨荧光性能的影响

分别选用铕-β-二酮类三元配合物、铕-芳香羧酸类三元配合物、铕-β-二酮-芳香羧酸类四元配合物作为荧光剂,制备了荧光防伪胶印油墨,研究了荧光剂种类、荧光剂用量对油墨荧光性能的影响。结果表明:铕-β-二酮-芳香羧酸类四元配合物具备有发光强度高,热、光稳定性好等优点,适合制备荧光防伪油墨;该类油墨中荧光剂质量分数在8%左右较为适宜。     

稀土有机配合物荧光材料的研究进展

概述稀土有机配合物的荧光发光机理,即有机配体通过对稀土离子的敏化作用,并将其跃迁的能量传递给稀土离子供其发光;列举芳香胺类、β-二酮类和多胺多羧酸类等新型的有机配体结构。提出稀土有机配合物材料的研究与应用应致力于研发高性能有机配体,并着手解决极易被水猝灭和量子产率不高等问题。认为合成平面刚性强并对稀土离子进行有效保护的新型有机配体,可以有效增强稀土有机配合物的荧光强度以改善其应用范围。     

稀土铕四元配合物纳米微晶的制备及性能

为了得到粒径均匀的纳米稀土铕四元配合物,采用化学沉淀法,进一步优化试验条件,制备Eu(BA)(TTA)2邻菲罗林纳米微晶,采用元素分析、红外光谱、热重分析、荧光光谱和透射电镜等方法对其进行表征和分析。结果表明,稀土铕四元配合物中高效率的能量传递是通过在2种不同第一配体之间形成的"协同效应"来完成,四元配合物中3种不同的配体可以更好地取代配位水;四元稀土配合物不仅发光性能优于常见的三元配合物,而且热稳定性好,粒径较小且均匀,可进一步掺入高分子形成功能性含稀土高分子聚合物;选用合适的缓冲溶液,在调节pH时将缓冲溶液缓慢地逐滴加入,可采取往反应体系中通氨气的方法,以使体系的pH改变较为平稳,生成的沉淀粒径较小且均匀。     

真空沉积强荧光稀土配合物薄膜的研究

通过真空加热沉积方法，制备了强荧光稀土配合物三（α－噻吩甲酰三氟丙酮基）－（９－丁基甲胺基－４，５－二氮杂芴）合铕（Ⅲ）的均匀薄膜，用Ｘ射线衍射，红外谱、Ｘ射线光电子谱、荧光光谱和透射电镜对该薄膜进行了研究。     

铕配合物的合成及其荧光防伪油墨的制备

选用苯甲酸(BA)、噻吩甲酰三氟丙酮(TTA)、邻菲咯啉(Phen)作为配体合成了Eu(BA)3Phen三元配合物、Eu(BA)(TTA)2Phen四元配合物,将其作为荧光剂,制备了稀土荧光防伪油墨。红外光谱的分析表明配体与铕离子发生了配位。测定了配合物和荧光防伪油墨的荧光性能,发射波长为614 nm,制备的稀土荧光防伪油墨在可见光下印迹无色,在紫外灯下呈现明显红色荧光。     

真空沉积强荧光稀土配合物薄膜的研究

通过真空加热沉积方法，制备了强荧光稀土配合物三（α-噻吩甲酰三氟丙酮基）一（9－丁基甲胺基－4，5－二氮杂芴）台铕（Ⅲ）的均匀薄膜，用X射线衍射、红外谱、X射线光电子谱、荧光光谱和透射电镜对该薄膜进行了研究。     

稀土(铕、铽)三元配合物的合成、表征与发光性能

合成了Eu(TFA)3(TPPO)2、Tb(TFA)3(TPPO)2三元配合物以及Eu1／2Tb1／2(TFA)3(TPPO)2三元双核配合物，并经元素分析、紫外-可见吸收光谱和红外透射光谱确认。研究了配合物的发光性质,发现了该三元体系配合物的摩擦发光现象,且三元双核配合物经摩擦发出明亮的白光。     

铕配合物与苯乙烯共聚物的研究

Copolymers containing rare earth complex were prepared via copolymerizing complex Eu^3 (BA)2 (AA) (phen)) with styrene. A sort of semitransparent luminescent polymer material with high fluorescent intensity was obtained. They were characterized by means of IR and UV spectra, which show that they were copolymers, not blendings. The fluorescence spectra of copolymer indicated that it showed intense UV absorption characteristics of rare earth complex as long as only a little complex join in it. Moreover, thermal analysis showed that they had excellent heat-stability.     

Tensile properties of polymethyl methacrylate coated natural fabric Sterculia urens

The newly identified natural fabric from the tree of Sterculia urens was coated with Polymethyl methacrylate. The tensile properties of both the uncoated and Polymethyl methacrylate coated fabrics were studied. The tensile parameters such as maximum stress, Young's modulus and % elongation at break were determined using a Universal Testing Machine. The effect of alkali treatment and the Polymethyl methacrylate coating on tensile properties of the fabric was studied. The morphology of the fabric before and after alkali treatment and Polymethyl methacrylate coating was studied using the scanning electron microscopy and polarized optical microscopic techniques respectively. The improvement in the tensile properties on Polymethyl methacrylate coating was attributed to the filling up of the void regions of the uniaxial fabrics with Polymethyl methacrylate facilitating continuity.     

Strength of irradiated polymethyl methacrylate

The effect of the form of radiation (reactor and-radiation, X-rays and ultraviolet light) and absorbed energy on the strength of polymethyl methacrylate was studied. It was shown that the strength of this polymer depends in the first place on the size of radiation-induced defects and not on their distribution across the specimen thickness. When therefore the absorbed radiation energy is nonuniformly distributed along the specimen cross section, the mechanical properties of irradiated materials are determined by the radiation dose absorbed by the specimen surface layers.     

甲基丙烯酸甲酯与丙烯酸丁酯规整接枝共聚物的合成及性能研究

采用聚丙烯酸丁酯大分子单体和甲基丙烯酸甲酯小分子单体共聚 ,合成了以甲基丙酸甲酯为主链、丙烯酸丁酯为支链的规整接枝共聚物。用红外光谱表征结构 ,研究了大单体的投料量、引发剂的用量及共聚反应温度对接枝效率的影响。并且研究了接枝共聚物的力学性能影响因素 ,当聚丙烯酸丁酯大单体的分子量大于 50 0 0 ,投料重量百分比在 6 0 %左右 ,得到性能良好的热塑性弹性体     

Diffusion of alcohol-rhodamine 6G in polymethyl methacrylate

Rhodamine 6G (Rh6G) is impregnated in polymethyl methacrylate by concentration difference diffusion method. The diffusion behaviour of ethanoic and methanoic Rh6G in polymethyl methacrylate at temperatures between 35 and 70° C were studied. The following results were obtained: (a) Visually observed sharp boundary, characteristic of Case II transport, during diffusion of alcohol penetrates at a rate of 1.7×10^–6 cm sec^–1 with an activation energy of 23 kcal mol^–1 for ethanol-polymethyl methacrylate system and 1.0×10^–5 cm sec^–1, with 23 kcal mol^–1 for methanol-polymethyl methacrylate, respectively, at 60° C. (b) Diffusion of alcoholic Rh6G in polymethyl methacrylate is greatly hindered since internal stresses exist in the swollen region of the glassy polymer. (c) Diffusion of alcoholic Rh6G in swollen polymethyl methacrylate with equilibrium alcohol concentration followed Fickian kinetics. The diffusion coefficient of Rh6G at 60° C is determined as 5.2×10^–8 cm² sec^–1 with an activation energy of 41 kcal mol^–1 for the wet ethanol-polymethyl methacrylate and 6.1×10^–8 cm² sec^–1, with 34 kcal mol^–1 for the wet methanol-polymethyl methacrylate systems, respectively.     

Rib formation in the fracture of polymethyl methacrylate

Polymethyl methacrylate was fractured under a variety of loading conditions. Various linear features were observed on fracture surfaces but attention was centered on ribs of torn-out material. Such ribs were formed only in cases where loading conditions resulted in a tensile stress field ahead of the crack tip. Moreover the width of the ribs, and also their spacing, increased as the crack traversed the specimen into zones of increasing tensile stress. These observations, along with previously published data on the dependence of rib spacing on molecular weight and temperature, led to the conclusion that rib formation was due to secondary tensile fractures. These were identified to be showers of microcracks, from side views of the ribs. Fractographic evidence was obtained that the crack accelerates after formation of each rib (i.e. shower) and a “stick-slip” mechanism adopted.