Beijing National Laboratory for Molecular Sciences, Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences , Zhongguancun North First Street 2, Beijing 100190, P. R. China.
ACS Appl Mater Interfaces. 2014 Aug 13;6(15):12252-60. doi: 10.1021/am501843s. Epub 2014 Jul 16.
Acrylonitrile-butadiene-styrene resin (ABS)/graphene nanocomposites were prepared through a facile coagulation method. Because the chemical reduction of graphene oxide was in situ conducted in the presence of ABS at the dispersion stage, the aggregation of the graphene nanosheets was avoided. It was shown by transmission electron microscopy that the graphene nanosheets were selectively located and homogeneously dispersed in the styrene-acrylonitrile (SAN) phase. The electrical conductivity and linear viscoelastic behavior of the nanocomposites were systematically studied. With increasing filler content, graphene networks were established in the SAN phase. Consequently, the nanocomposites underwent a transition from electrical insulator to conductor at a percolation threshold of 0.13 vol %, which is smaller than that of other ABS composites. Such a low percolation threshold results from extreme geometry, selective localization, and homogeneous dispersion of the graphene nanosheets in SAN phase. Similarly, the rheological response of the nanocomposites also showed a transition to solid-like behavior. Due to the thermal reduction of graphene nanosheets and structure improvement of graphene networks, enhanced electrical conductivity of the nanocomposites was obtained after annealing.
丙烯腈-丁二烯-苯乙烯树脂 (ABS)/石墨烯纳米复合材料通过简便的凝聚方法制备。由于氧化石墨烯的化学还原是在 ABS 存在的情况下在分散阶段原位进行的，因此避免了石墨烯纳米片的聚集。透射电子显微镜表明，石墨烯纳米片选择性地位于并均匀分散在苯乙烯-丙烯腈 (SAN) 相中。系统地研究了纳米复合材料的电导率和线性粘弹行为。随着填充剂含量的增加，在 SAN 相中建立了石墨烯网络。因此，纳米复合材料在 0.13 体积%的渗流阈值下从电绝缘体转变为导体，这小于其他 ABS 复合材料的渗流阈值。如此低的渗流阈值归因于石墨烯纳米片在 SAN 相中极端的几何形状、选择性定位和均匀分散。类似地，纳米复合材料的流变响应也表现出向固态行为的转变。由于石墨烯纳米片的热还原和石墨烯网络结构的改善，纳米复合材料在退火后获得了增强的电导率。
