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Th Study On Synthesis Of The Nanowhiskers And Research On Their Performance

Posted on:2012-09-04Degree:DoctorType:Dissertation
Country:ChinaCandidate:Y H ZhengFull Text:PDF
GTID:1101330335452986Subject:Physical chemistry
Abstract/Summary:PDF Full Text Request
The crystal and hydrophobic zinc borate nanowhiskers were successfully prepared by a wet method using borax and zinc salts as raw materials in situ aqueous solution, and phosphate ester as the modifying surface agent. Surface energy of zinc borate nanoparticles was reduced, and the comparability between zinc borate nanoparticles and polymers was enhanced.The morphology, composition, diameter, size, differential thermal and weight loss of zinc borate particles were measured by X-ray diffraction (XRD), transmission electron microscopy (TEM) equipped with an energy-dispersive X-ray spectrometer(EDS), and differential thermal and thermogravimetric analysis (DTA-TGA) in air. The possible reaction route, the different pH values of the solution on synthesis of pure zinc borate and the reaction temperature on the size of zinc borate were discussed.The different shape of zinc borate will be added to the polyethylene, we investigated the thermodynamics stability of the composite material. We can see that zinc borate whiskers can be well composited with PE through our experiment from the electron micrograph. Zinc borate particles can be well infused into polyethylene. According to the similar phase, we also can include that the products have very good hydrophobicity, so they will be easily dissolved with organic molecules. The compound of zinc borate/polyethylene has perfect stability with adding the zinc borate, and the thermodynamics decomposition temperatures have been increased nearly 150 degrees. Therefore, we investigated the reaction mechanism, and the changes of related activation energy. This will be proved theoretically.At the same time, we also investigated the optical properties of zinc borates. The different concentrations of activation ion Eu ions doped have great effects the the luminescent properties of the materials. Although there are a lot of reports for the research of materials luminescence properties of borate for the matrix, the material luminous property has been improved largely in my experiments. It is concluded that the best doping quantity of Eu doped zinc borate nanocrystal is 5%, and the optimum reaction time for 6-8 hours, and the best reaction temperature for 60℃. We also attempted to reverse drops and change surfactants, but the results of the experiments have not successed. The good news is that the properties of products can achieve industrial application standards with 400℃sintering. Then, we discussed the mechanism about this change.The crystal and hydrophobic copper borate nanowhiskers were successfully prepared by a wet method using borax and bluestone as raw materials in situ aqueous solution, and phosphate ester as the modifying surface agent. The morphology, size, and differential thermal-thermogravimetric situation have been investigated by the X-ray diffraction (XRD), transmission electron microscope (TEM), and differential thermal-thermogravimetic analysis (DTA-TGA) analysis method. Based on the discussion of experimental condition, we have summarized the reaction process, particle formation process and the reaction mechanism of this experiment. Meanwhile, we add copper borate to the base oil, and the modified copper borate can be easily mixed with organic materials, which can show us greatly capability of dispersing with organic matter, and solve the difficult problem the uniform dispersion of inorganic polymer particles, and also can greatly reduce the friction coefficient of the base oil.No matter what the preparation of zinc borate or copper, we have met the same question that there is plenty of the filtrate of sodium sulfite during the experiments. In our country, there are a large number of sodium discharges in industrial production, which bring the great pollution to the environment. Therefore, we hope to find the way to solve this problem in my thesis. We try to use the sodium sulfate as the raw material to react with calcium salt to synthesize calcium sulfate whiskers, which have been largely needed in the industry, and also recycle and reuse sodium sulfate.
Keywords/Search Tags:Borate, Whisker, Hydrophobicity, Macromolecule compound, Surfactant, Thermal stability
PDF Full Text Request
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