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首页> 外文期刊>Polymers for advanced technologies >Improved polyvinylpyrrolidone (PVP)/ graphite nanocomposites by solution compounding and spray drying
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Improved polyvinylpyrrolidone (PVP)/ graphite nanocomposites by solution compounding and spray drying

机译：通过溶液混合和喷雾干燥改进的聚乙烯吡咯烷酮（PVP）/石墨纳米复合材料

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In order to evaluate the roles of graphite dispersion on the functional properties of the composites, PVP/graphite nanocomposites were prepared by blending the aqueous suspension of expanded graphite sheets and polyvinylpyrrolidone (PVP) aqueous solution by ultrasonic treatment, followed by spray drying and direct drying as a comparison individually. The effects of graphite loading and drying method on the dispersion of graphite and the resultant properties of the composites such as electrical and thermal conductivity, friction, and dynamic mechanical properties were studied. The results from transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray diffraction showed that the composites prepared by fast spray drying exhibited a higher degree of exfoliation and a better dispersion of graphite sheets in the PVP matrix than the corresponding composites prepared by direct drying, leading to a conclusion that fast spray drying can effectively prevent from re-stacking of the exfoliated graphite sheets as illustrated. As a result, dynamic mechanical thermal analysis showed significant increases in the storage modulus and glass transition temperature for the composites prepared by spray drying. Besides, the spray drying as well greatly improved the electrical and thermal conductivity of the composites. It was also found that the electrical and thermal conductivity of the composites strongly depended on the graphite dispersion, while the friction coefficient unexpectedly does not. Increasing graphite loading level might enhance the probability of graphite sheets re-stacking, resulting in poor graphite dispersion.
机译：为了评估石墨分散体对复合材料功能性能的作用，通过超声处理将膨胀石墨片的水悬浮液和聚乙烯吡咯烷酮（PVP）水溶液混合，然后喷雾干燥和直接干燥，制备了PVP /石墨纳米复合材料作为单独的比较。研究了石墨加载和干燥方法对石墨分散性的影响以及复合材料的导电，导热，摩擦和动态力学性能等特性。透射电子显微镜（TEM），扫描电子显微镜（SEM）和X射线衍射的结果表明，与PVP基质相比，通过快速喷雾干燥制备的复合材料表现出更高的剥离度和更好的石墨片在PVP基质中的分散性。通过直接干燥制备相应的复合材料，得出的结论是，快速喷雾干燥可有效防止剥落的石墨片重新堆积，如图所示。结果，动态机械热分析表明通过喷雾干燥制备的复合材料的储能模量和玻璃化转变温度显着增加。此外，喷雾干燥也大大改善了复合材料的电导率和导热率。还发现，复合材料的电导率和导热率在很大程度上取决于石墨的分散性，而摩擦系数出乎意料地不是。石墨加载量的增加可能会增加石墨片材重新堆叠的可能性，从而导致石墨分散性差。

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