Tunable positive temperature coefficient of resistivity in an electrically conducting polymer/graphene composite
Tunable positive temperature coefficient of resistivity in an electrically conducting polymer/graphene composite
复制标题
导电聚合物/石墨烯复合材料中可调节的电阻率正温度系数
DOI：
10.1063/1.3457170
复制
发表时间：
2010-06-21
影响因子：
4
通讯作者：
Li, Zhong-Ming
中科院分区：
文献类型：
--
作者：
Pang, Huan;Zhang, Yi-Chuan;Li, Zhong-Ming
石墨烯纳米片(GNS)/超高分子量聚乙烯复合材料具有二维gnns导电网络，在一定温度下热处理后电阻率正温度系数（PTC）增加。这种异常现象源于聚合物基体粘度的降低、结晶引起的局部流动以及GNSs重叠节点之间的弱相互作用，使得GNSs向聚合物基体迁移，从而削弱了导电路径，增加了PTC强度。因此，开发了一种简便的方法来制备具有可调谐PTC强度的导电聚合物复合材料。
The graphene nanosheet (GNS)/ultrahigh molecular weight polyethylene composite with a two-dimensional conductive network of GNSs exhibits an increasing positive temperature coefficient (PTC) of resistivity while thermally treated at a certain temperature. This anomalous phenomenon is originated from the reduced viscosity of polymer matrix, crystallization induced local flow and weak interactions among the overlapping joints of GNSs, which allow GNSs to migrate to the polymer matrix, thus weakening the conductive paths and increasing the PTC intensity. A facile approach is accordingly developed to prepare a conductive polymer composite with a tunable PTC intensity.