共查询到20条相似文献,搜索用时 15 毫秒
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采用原位接枝插层法制备了聚丙烯/蒙脱土纳米复合材料.借助长链有机胺有机化的蒙脱土在溶液中与马来酸酐和少量辅助溶胀剂进行溶胀;溶胀后的有机蒙脱土再与聚丙烯、适量引发剂在Haake混炼机中进行熔融反应,得到一种聚丙烯/蒙脱土接枝插层共混物;再将接枝插层共混物按一定比例与聚丙烯在Haake混炼机中进行混炼得到聚丙烯/蒙脱土纳米复合材料.用X射线衍射仪(XRD)、透射电镜(TEM)和热失重分析仪(TGA)分别对各步骤的产物进行表征.产物的XRD和TEM分析结果表明蒙脱土完全剥离并均匀分散在聚丙烯基体中,形成了真正的聚丙烯/蒙脱土纳米复合材料.TGA分析结果显示出该纳米复合材料具有相当好的热稳定性. 相似文献
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Hiroshi Tateyama Kinue Tsunematu Hideaki Noma Yasuo Adachi Hideaki Takeuchi Norihiko Kohyama 《Journal of the American Ceramic Society》1996,79(12):3321-3324
To investigate the transformation process from talc to expandable micas, mixtures of talc and Na2 SiF6 were heated from 600° to 900°C and air-quenched at 50°C intervals. The air-quenched product at 800°C mainly consisted of expandable micas with a basal spacing of 1.25 nm, nonexpandable materials with a basal spacing of 0.96 nm, and a small amount of talc used as the starting material. A lattice fringe image by HRTEM of the product shows that the layer spacing at the edges surfaces is about 1.2 nm, but the layer spacing inside of the particles is close to that of talc. Such a nanostructure indicates a topotactic reaction from talc to expandable micas and confirms that Na+ ions intercalate into the structure from the edge to the core. 相似文献
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J.G. Hooley 《Carbon》1975,13(6):469-471
A technique is described which will distinguish between the amount of AlCl3 that is intercalated by a carbon and the amount that adds in other ways. The method is applied to a variety of carbons and the results are compared with those reported for the reactions of K-Cs vapors with these same carbons. 相似文献
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蒙脱石是一种具有离子交换性的层状硅酸盐粘土矿物,利用其结构特性可以制备插层复合材料。这种通过插层反应得到的复合材料兼有无机主体和客体分子的性质,从而表现出不同于单一组分所具有的催化、吸附以及光、电、磁等性能,在构筑下一代的光学、光电纳米器件,化学或生物传感器,分子识别以及催化等领域存在潜在应用的价值。 相似文献
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本文介绍了原电池的设计,阐明了配合物稳定常数的计算,使学生深刻理解氧化还原电对的电极电势与配合物的稳定常数之间的关系。 相似文献
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溶液插层法制备MHA-g-EG导电纳米复合材料 总被引:1,自引:0,他引:1
用溶液插层法制备了马来酸酐接枝聚乙烯(MHA—g—PE)/膨胀石墨(EG)导电纳米复合材料,并用XRD、TEM、SEM和光学显微镜对其结构进行了表征。研究表明:采用此法制得的MHA—g—PE,其室温逾渗阀值(Фc=0.67%),远低于采用常规熔体混合法制得的MHA—g—PE/EG复合材料的室温逾渗阀值(Фc=2.74%)。在该导电纳米复合材料中,MHA-g—PE插入到EG石墨片层之间和石墨薄片孔隙之中,形成了纳米和微米尺度的MHA—g—PE/EG复合网络,使分散在MHA—g—PE基体中的EG粒子具有很大的宽厚比;能使EG在用量较低时,彼此靠近和接触,形成导电通路,故材料具有低Фc和高导电性。 相似文献
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合成了低摩尔质量水溶性酚醛树脂(PF),再与有机蒙脱土(OMMT)复合,并分析了PF/MMT复合材料的结构和性能。结果表明:水溶性低摩尔质量酚醛树脂与有机蒙脱土相容性良好,得到部分插层部分剥离型PF/MMT纳米复合材料(PMNC);PMNC的醚键减少,--OH增多,蒙脱土与酚醛树脂分子很可能通过氧原子产生了较强联接;与常规陬俐MT复合材料相比,PMNC的热分解特性改变,耐热性更好,表现出一定纳米效应。 相似文献
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For the study of the acidic character of layered perovskite oxide, HLaNb2O7 (HLa), the intercalation of water and alcohols was performed and further the HLa was used of dehydration of 1- and 2-butanol as a test reaction. The acidic properties of the HLa was greatly affected by the irreversible water in the interlayer removed in the temperature range of 350°C
00°C. In the presence of water, the intercalation of hydrophilic nalcohols having carbon number below 5 occurred. Dehydration activity of 2-butanol was higher than 1-butanol and produced only n-butenes. On the other hand, butenes and n-butylaldehyde were produced in the reaction of 1-butanol, especially the formation of the latter was predominant at the lower temperature as 200°C
50°C. With raising the heat-treatment temperature of the catalyst its acidity decreased and was almost lost at 500°C. However, the selectivity to n-butylaldehyde increased, indicating that the acidity did not concern to the nbutylaldehyde formation. The reaction behaviors of 1-and 2-butanol on the HLa catalyst were discussed. 相似文献