Effect of Graphite Nanoplate Morphology on the Dispersion and Physical Properties of Polycarbonate Based Composites.
Effect of Graphite Nanoplate Morphology on the Dispersion and Physical Properties of Polycarbonate Based Composites.
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DOI：
10.3390/ma10050545
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发表时间：
2017-05-18
期刊：
影响因子：
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通讯作者：
Pötschke P
中科院分区：
文献类型：
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作者：
Müller MT;Hilarius K;Liebscher M;Lellinger D;Alig I;Pötschke P
研究了工业石墨纳米片（GNP）材料的形貌对其在聚碳酸酯（PC）中分散性的影响。GNP的形态学类型被鉴定为三种，即层状、碎片状或致密结构。在熔融混合期间，所有GNP类型在PC中的分散体演变与不同的熔体温度、螺杆速度或混合时间相似。增加的剪切应力减小GNP一级结构的尺寸，由此GNP纵横比减小。在所选择的熔融混合条件下，不能实现对单个或少数石墨烯层的显著GNP剥离。所得GNP宏观分散体取决于单个GNP形态、粒度和堆积密度，并且清楚地反映在复合材料的电、热、机械和气体阻隔性能中。基于与碳纳米管（CNT）和炭黑（CB）的比较，CNT在导电性方面被推荐，而对于导热或气体阻隔应用，GNP是优选的。
The influence of the morphology of industrial graphite nanoplate (GNP) materials on their dispersion in polycarbonate (PC) is studied. Three GNP morphology types were identified, namely lamellar, fragmented or compact structure. The dispersion evolution of all GNP types in PC is similar with varying melt temperature, screw speed, or mixing time during melt mixing. Increased shear stress reduces the size of GNP primary structures, whereby the GNP aspect ratio decreases. A significant GNP exfoliation to individual or few graphene layers could not be achieved under the selected melt mixing conditions. The resulting GNP macrodispersion depends on the individual GNP morphology, particle sizes and bulk density and is clearly reflected in the composite’s electrical, thermal, mechanical, and gas barrier properties. Based on a comparison with carbon nanotubes (CNT) and carbon black (CB), CNT are recommended in regard to electrical conductivity, whereas, for thermal conductive or gas barrier application, GNP is preferred.