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《化工设计通讯》2020,(1)
聚合物分散液智能开关,全息材料等领域具有广阔的应用前景,激光全息技术飞速发展,使得激光全息聚合物分散液材料产生,其原理是利用光引发单体聚合,其性能主要取决于体系的相分离程度及折射率对比度。采用钛酸四丁酯为先驱物,冰醋酸为抑制剂,制备纳米二氧化钛溶胶,将单体滴加到纳米二氧化钛溶胶中,过硫酸钾单体在纳米二氧化钛溶胶粒子发生聚合反应,得到被覆聚丙烯酸酯分散液,使用动态光散仪分析纳米二氧化钛溶胶粒径,利用投射电镜观察被覆聚丙烯酸酯分散液形貌,探讨最佳溶胶单体混合液pH值,及纳米二氧化钛溶胶质量分数对被覆聚丙烯酸酯分散液成膜性能的影响,表明制备纳米二氧化钛溶胶平均粒径为263nm,包裹纳米二氧化钛溶胶粒子最佳反应温度为75℃,溶胶单体混合液pH值为8,溶胶质量分数最佳为20%。 相似文献
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以丙烯酸酯单体为原料,采用常规溶液聚合法制备了聚丙烯酸酯溶液,以钛酸正丁酯为前驱体,水解制备纳米二氧化钛溶胶,两者在常温高剪切力下共混,制得聚丙烯酸酯/纳米TiO2有机-无机杂化材料。分别用透射电子显微镜(TEM),原子力显微镜(AFM),双光束紫外-可见分光光度计UV-VIS,热重分析(TGA),拉伸测试研究了纳米溶胶以及杂化材料的性能。结果表明:TiO2在溶胶和杂化材料中都呈纳米级均匀分散,而且杂化材料的光学,热学,力学性能都比纯聚丙烯酸酯有显著的提高。 相似文献
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The properties of nano‐zinc oxide master batch filled butadiene styrene rubber (SBR) systems were researched in comparison with those of common zinc oxide and nano‐zinc oxide filled systems. First, the nano‐zinc oxide master batch was prepared and the cure characteristics of three different kinds of zinc oxide filled SBR composites were studied; second, the mechanical properties and wear resistance were compared; then, the improved mechanical properties were confirmed by dynamic mechanical properties and transmission electron microscopy. Finally, the zinc oxide amount reducing mechanism was analyzed. Results show that nano‐zinc oxide master batch filled SBR system has better mechanical properties than those of nano‐zinc oxide and common zinc oxide filled systems, which is due to the improved dispersion by master batch mixing technology. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 922–930, 2006 相似文献
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M. Asadi M. Montazer 《Journal of Inorganic and Organometallic Polymers and Materials》2013,23(6):1358-1367
Surface modification and property improvement of hollow polyester fiber nonwoven fabric is very important due to the application of substrate in the various fields. Here, nano clay, nano TiO2 and polysiloxane softener as been applied on the hollow polyester fiber nonwoven fabric through conventional impregnation-dry-cure method in order to enhance the fabric properties. The alkaline hydrolysis of polyester was performed on the nonwoven surface to functionalize the fabric and increase the nanoparticles uptake. The nano clay was first dispersed by using nonionic dispersing agent, and then nano titanium dioxide dispersion was added dropwise to the prepared nano clay dispersion. Also, other dispersions were prepared with adding polysiloxane softener and polyurethane resin under sonication. The SEM images and EDX/XRD patterns indicated the presence of various applied particles on the surface of the fabric. Thermal gravimetric analysis was employed to investigate the thermal decomposition behavior of the treated samples. Self-cleaning properties of polyester nonwoven treated by TiO2/nano clay/polysiloxane composite was followed by degradation of methylene blue under daylight irradiation at ambient temperature. It was found that nano clay/TiO2/polysiloxane composite on the fabric surfaces improved self-cleaning property, thermal stability above 400 °C, and water absorption properties of the fabric. 相似文献
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HIPS/TiO2/TAS纳米复合材料的制备及性能 总被引:15,自引:3,他引:12
通过对纳米TiO2表面预处理及选择特定的大分子分散H(TAS)和母料法制备工艺制备了HIPS/TiO2/TAS纳米复合材料,测试结果表明,制备的HIPS/TiO2/TAS纳米复合材料较原HIPS具有更好的综合力力学性能,且较原HIPS的硬度、耐热性能、阻燃性能亦同时得到提高。 相似文献
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With the increasing interest in environmental and health issues, legal restrictions, such as European Union (EU) End of Life Vehicle Directives, were strengthened. This led us to incorporate nano zinc oxide (nano‐ZnO), with particle sizes of 30–40 nm and specific surface areas of 25.0–50.0 m2/g, instead of conventional ZnO into natural rubber (NR)/butadiene rubber (BR) compounds to decrease the content of zinc in the formulation. In the unfilled system, only a 20 wt % nano‐ZnO content, compared to conventional zinc oxide content, showed the cure characteristics and mechanical properties of the same level. This was because the increase in the specific surface area of the nano‐ZnO led to an increase in the degree of crosslinking. The effect of nano‐ZnO on the cure characteristics and mechanical properties was more pronounced in the silica‐filled system than in the unfilled system. This was mainly because of the dispersing agent used in the silica‐filled system, which also improved the dispersion of nano‐ZnO. The silica‐filled NR/BR compounds containing 0.3–3.0 phr of nano‐ZnO showed improved curing characteristics and mechanical properties, such as optimum cure time, 100 and 300% modulus, tensile strength, and tear strength compared to the compound with 5 phr of conventional ZnO. The optimum amounts of nano‐ZnO and stearic acid were only 1.0 and 0.1 phr, respectively. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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