共查询到19条相似文献,搜索用时 109 毫秒
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自从丰田中心率先研究出了尼龙6/有机粘土纳米复合材料之后,聚合物/层状硅酸盐纳米复合材料引起了很多高分子科学家的关注。纳米复合材料就是一些无机填料以纳米级均匀分散在高聚物基体中形成的复合材料。粘土片层被聚合物插层或剥离可形成聚合物/粘土纳米复合材料。 相似文献
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Hua Wang Changchun Zeng Mark Elkovitch L. James Lee Kurt W. Koelling 《Polymer Engineering and Science》2001,41(11):2036-2046
Polymeric nano‐composites are prepared by melt intercalation in this study. Nano‐clay is mixed with either a polymer or a polymer blend by twin‐screw extrusion. The clay‐spacing in the composites is measured by X‐ray diffraction (XRD). The morphology of the composites and its development during the extrusion process are observed by scanning electron microscopy (SEM). Melt viscosity and mechanical properties of the composites and the blends are also measured. It is found that the clay spacing in the composites is influenced greatly by the type of polymer used. The addition of the nano‐clay can greatly increase the viscosity of the polymer when there is a strong interaction between the polymer and the nano‐clay. It can also change the morphology and morphology development of nylon 6/PP blends. The mechanical test shows that the presence of 5–10 wt.% nano‐clay largely increases the elastic modulus of the composites and blends, while significantly decreases the impact strength. The water absorption of nylon 6 is decreased with the presence of nano‐clay. The effect of nano‐clay on polymers and polymer blends is also compared with Kaolin clay under the same experimental conditions. 相似文献
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介绍了纳米二氧化硅(SiO2)在聚合物中的应用情况,阐述了不同聚合物(包括聚丙烯、聚乙烯、聚氯乙烯、聚甲基丙烯酸甲酯、聚对苯二甲酸乙二醇酯)添加SiO2后,其微观结构、结晶行为、力学性能、热性能、阻燃性能等的变化趋势。 相似文献
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Polymer nano‐composites made with a matrix of anhydride‐cured diglycidyl ether of bisphenol A (DGEBA) and reinforced with organo‐montmorillonite clay were investigated. A sonication technique was used to process the epoxy/clay nano‐composites. The thermal properties of the nano‐composites were measured with dynamic mechanical analysis (DMA). The glass transition temperature Tg of the anhydride‐cured epoxy was higher than the room temperature (RT). For samples with 6.25 wt% (4.0 vol%) of clay, the storage modulus at 30°C and at (Tg + 15)°C was observed to increase 43% and 230%, respectively, relative to the value of unfilled epoxy. The clay reinforcing effect was evaluated using the Tandon‐Weng model for randomly oriented particulate filled composites. Transmission electron microscopy (TEM) examination of the nano‐composites prepared by sonication of clays in acetone showed well‐dispersed platelets in the nano‐composites. The clay nano‐platelets were observed to be well‐intercalated/expanded in the anhydride‐cured epoxy resin system. POLYM. COMPOS., 26:42–51, 2005. © 2004 Society of Plastics Engineers. 相似文献
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图像分析技术在聚合物/粘土纳米复合材料微观结构形态研究中的应用 总被引:1,自引:0,他引:1
基于MATLAB图形及影像处理技术,开发了适用于处理聚合物/粘土纳米复合材料(PCN)微观结构形态的应用程序。应用程序包含边界探测和颗粒尺寸分析两个子程序,具有探测孤立颗粒边界和计算颗粒尺寸功能。应用该程度分析了聚丙烯/蒙脱土(PP/MMT)纳米复合材料初级结构的TEM照片,得到蒙脱土片层在PP基体中的微观结构形态和尺寸分布。结果表明:该图像分析技术能够快速有效地确定PCN的TEM照片中粘土片层的形状和尺寸。此外,该图像分析技术还可以用于共混物形态的研究。 相似文献