Wen Shipeng

Fluorescence Properties of Eu3+/Gd3+/Citric Acid Mixed Complexes Doping in Silicon Rubber Matrix

Abstract Series of doped rare earth complexes-EuxGd(1-x) (CA)3 · nH2O (CA = citric acid) were synthesized. Some characterizations were taken for these complexes. The experimental results shows that the doped rare earth complexes have the best fluorescence property when the ratio of Eu and Gd is from 0.7 to 0.3. Silicon rubber-based composites were prepared by mechanical blending the EuxGd(1-x) (CA)3 · nH2O and silicon rubber. Then, the fluorescent property of the composites was studied. It is found that the fluorescence intensity of the composites increase linearly with the contents of the rare earth complexes increasing.

Eu(TTA)2 (phen) (UAH)/SiR Fluorescence Materials Prepared by In-Situ Reaction Method

Abstract Eu(TTA)2(phen) (UAH) (UAH = undecylenic acid) with fine fluorescent property and active group was synthesized. The measurement and characterization of complexes were also carried out. A series of composites based silicon rubber were prepared by blending silicon rubber and Eu(TTA)2(phen) (UAH) rare earth complex with active groups. Next, the effect of vulcanizing time on the property of materials was mainly studied. The results show that the dispersed particle size of rare earth complexes decreases gradually in the vulcanizing process.

Preparation of Eu (TTA)2phen (MA)/SiR Fluorescent Materials under High Mechanical Blending Temperature

Abstract Eu(TTA) 2 (phen)(MA) complexes were synthesized, in which MA was introduced as the acidic ligand to increase the fluorescent intensity of the complexes. The complexes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and fluorescent spectra, respectively. Different amounts of rare earth complexes were blended with silicon rubber over the melting point of Eu(TTA) 2 (phen)(MA). Next, a definite amount of 2,5-dimethyl-2, 5-di (tert-butylperoxy) hexane was added as a cross linker to the composite, to get the uncured composites. Subsequently, the composites were vulcanized at 160 °C, and silicon rubber-based composites with different contents of the complexes were prepared and their fluorescent properties were observed. The contents of rare earth complexes were 0.96%, 2.83%, 4.63% and 6.36% (mass fraction), respectively. Moreover, the composites of Eu(TTA) 2 (phen)(MA)/SiR were measured by SEM, XRD, and fluorescent spectra. The measurement result shows that the fluorescent intensity of uncured rubber is similar to one of the pure rare earth complexes. However, there is no marked change of fluorescent intensity in the uncured rubber when the content of rare earth complexes continues to increase.

Exploration of Reactivity of Eu(TTA)2(phen) (MA)

Abstract The reactivity of Eu (TTA) 2 (phen) (MA) (HTTA = 2-thenoyltrifluoroacetone, MA = maleic anhydride) was studied. A series of products were prepared by direct polymerization, suspension polymerization, and alternate suspension and solution copolymerization with the styrene. And then we reactivity of these products were studied. The complexes were investigated and characterized by X-ray Diffraction (XRD), gel permeation chromatography (GPC) and fluorescence spec-trophotometer. Although high polymerization degree is not found in the exploration of reactivity, it is found that the fluorescent intensity of complexes prepared by suspension polymerization increases significantly compared with the original particles, which is five times higher than that of the pure rare earth complex.

Preparation and Magnetism of Gd2O3/X-NBR Composites

Abstract Series of Gd 2 O 3 /X-NBR composites were prepared by in-situ reaction at different temperatures (100 and 160°C) and different processing time. The influence of processing time and processing temperature on dispersion of Gd 2 O 3 was investigated, and the relationship between magnetic property and temperature was also discussed. The results show that, the mass magnetizability descends as temperature rising. Processing temperature and time do not exhibit evidenced effects on the mass magnetizability. All the composites show to be antiferromagnetic.