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聚合物纳米复合材料的制备方法 总被引:17,自引:0,他引:17
从纳米微粒的分散方法以及纳米复合材料的成型技术两方面综述了国内外纳米复合材料的制备方法的发展状况,总结了纳米微粒填充法与紫外光辐射固化技术的结合在制备纳米复合材料方面的几种优点,认为该方法是未来聚合物无机纳米复合材料的主要、新型制备方法。 相似文献
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聚合物—无机纳米复合材料的制备方法 总被引:1,自引:0,他引:1
聚合物—无机纳米复合材料是一种性能优异的新型复合材料,近年来成为材料科学的新热点。制备此种材料的新方法层出不穷,包括γ—射线辐射法,模板法,电化学合成法,LB膜技术,MD膜法等。本文对上述制备方法逐一进行了介绍,并对各种方法进行了评价。 相似文献
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累托石/NR纳米复合材料的结构与性能研究 总被引:4,自引:2,他引:2
研究乳液法和熔体法制备的累托石/NR纳米复合材料的结构与性能。结果表明,乳液法累托石/NR纳米复合材料为层间无高分子插入的隔离型纳米复合材料,熔体法累托石/NR纳米复合材料为典型的插层型纳米复合材料;当应变小于100%时,熔体法制备的复合材料应力较大,当应变大于100%时,乳液法制备的复合材料应力较大;当累托石用量较小时,乳液法制备的复合材料撕裂强度高于熔体法制备的复合材料;乳液法和熔体法制备的两种复合材料热稳定性差别不大,均好于纯NR。 相似文献
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采用乳液共凝法,研究了纳米CaCO3/胶清橡胶复合材料的制备与力学性能。结果表明:乳液共凝法制备纳米CaCO3/胶清橡胶复合材料时混合速度、混合时间,纳米CaCO3加入方法以及纳米CaCO3用量对复合材料的力学性能有较大的影响,乳液共凝法制备的复合材料综合性能较机械共混法制备的复合材料综合性能好。 相似文献
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在聚合物纳米复合材料中,聚合物/无机纳米复合材料占据主导地位。聚合物/无机纳米复合材料的制备方法主要有溶胶一凝胶(Sol-Gel)法、插层法、混合法。由于插层法方法简单,而且制备的聚合物纳米复合材料具有独特的性能,因此该方法在制备纳米复合材料时较为常用。 相似文献
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SBS/蒙脱土复合材料的制备及其性能Ⅱ.复合材料的性能 总被引:3,自引:0,他引:3
分别采用大分子溶液插层法和大分子熔融插层法制备了苯乙烯-丁二烯-苯乙烯共聚物(SBS)/蒙脱土纳米复合材料.研究了材料的力学性能。纳米结构的形成对复合材料的性能产生显著影响,少量蒙脱士的引入可以明显改善SBS/蒙脱土复合材料的力学性能。无论溶液插层法制备的星型SBS/蒙脱土纳米复合材料,还是熔融插层法制备的线型SBS/蒙脱土纳米复合材料,其拉伸强度和断裂伸长率都同时增加。其中,溶液插层法制备的纳米复合材料的拉伸强度和断裂伸长率分别较纯SBS增加了75%和55%;熔融法制备的纳米复合材料的托伸强度和断裂伸长率分别较纯SBS增加了70%和18%。 相似文献
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Ryszard J. Kaleczuk 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1994,59(1):73-81
The addition of Co to Fe/Al2O3 increases the catalytic activity in NH3 synthesis. The maximum effect is observed for 20% by weight of Co in the metallic phase. Bivalent cobalt atoms replace bivalent iron atoms (a similar ionic radius) in the crystal lattice. This process changes the reducibility of the samples. The Fe-Co compound and its formation results in the fairly high temperature of reduction (873 K) which is needed to prepare the most active catalyst. Changing the reactor atmosphere from reducing to inert causes the disappearance of free iron (escape of Fe to the crystal lattice of support with formation of a new compound with a spinel character). This is the effect of the iron-hydrogen interaction. The formation of an intermetallic iron-cobalt compound is crucial to the catalyst activity. This might be due to the surface restructuring by exposing the most active iron surface, Fe(111). The potassium addition in the form of KOH causes an increase in the catalytic activity. The increase is not as high as for a ‘super basic’ Fe-Co magnesium hydroxide carbonate supported catalyst studied earlier. A part of the potassium hydroxide is used to neutralize the acid sites on the surface of alumina. 相似文献
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绿色合成的研究与进展 总被引:6,自引:0,他引:6
介绍了绿色化学、绿色合成和原子经济性的基本含义,并简述了绿色合成已取得的进展。结合实例着重总结了改变作用的原料、试剂、溶剂、催化剂等以及采用新的方法进行合成设计的新成就。 相似文献
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Navjeet Kaur 《Journal of Sulfur Chemistry》2018,39(5):544-577
Solid-phase organic synthesis by combinatorial techniques is a widely exploited area in the discovery of new pharmacologically active compounds and is a rapidly expanding area of synthetic organic chemistry. Because of many biological activities possessed by heterocycles, a large number of reports related to their solid-phase synthesis have appeared in recent decades. In this review article, I have described the importance of solid-phase synthetic strategies for the synthesis of sulfur atom containing heterocycles. 相似文献
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Juliana F. De Conto Marília R. Oliveira Matheus M. Oliveira Thadeu G. Brandão Kelvis V. Campos Cesar C. Santana 《Chemical Engineering Communications》2018,205(4):533-537
Industry and academia have shown great interest in the synthesis of organic–inorganic hybrid material because the modification of inorganic supports with organic groups increases the options for using these materials. Microwave irradiation as a heat source is an alternative tool compared with conventional heating (oil bath or furnace) to reduce the reaction times during the synthesis of these materials. Thus, the purpose of this work was to synthesize an organic–inorganic hybrid material, more specifically silica nanoparticles modified with 3-chloropropyl-trimethoxysilane, using microwave irradiation as the heat source. The hybrid materials were synthesized using the sol–gel method, with microwave irradiation for 10, 25, and 40?min, at 300?W of power and temperature of 40, 60, and 80°C. Elemental analyses, FTIR, and N2 adsorption–desorption isotherms were developed to characterize the materials. It can be concluded that when microwave irradiation is used as a heat source, the reaction rate is accelerated and the surface area of hybrid materials increases considerably. 相似文献