Piezoresistive materials from directed shear-induced assembly of graphite nanosheets in polyethylene
Piezoresistive materials from directed shear-induced assembly of graphite nanosheets in polyethylene
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DOI：
10.1002/adfm.200400298
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发表时间：
2005-08-01
影响因子：
19
通讯作者：
Chen, GH
中科院分区：
文献类型：
--
作者：
Lu, JR;Weng, WG;Chen, GH
通过将纳米石墨片（GNs）与聚乙烯（PE）共混，在双辊轧机上成功制备了具有有序导电网络和低逾渗阈值的三维导电纳米复合材料。导电纳米片在复合材料中强烈取向，导致高度各向异性的性质。纳米复合材料的导电纳米片的分数最接近逾渗阈值具有急剧的正压力系数的电阻率，其中的突然转变可以归因于压缩应力引起的变形的导电网络。这种压阻效应强烈地依赖于填料形态、填料空间排列和填料浓度。
A three-dimensional conductive nanocomposite with an ordered conductive network and low percolation threshold has been successfully prepared by blending graphite nanosheets (GNs) with polyethylene on a two-roll mill. The conductive nanosheets orient intensively in the composite, leading to highly anisotropic properties. The nanocomposite with the fraction of conductive nanosheets closest to the percolation threshold possesses a sharp positive pressure coefficient of resistivity, in which the abrupt transition can be attributed to compressive-stress-induced deformation of the conductive network. Such piezoresistive effects depend strongly on filler morphology, filler spatial arrangement, and filler concentration.