Two percolation thresholds in carbon nanotube epoxy composites

被引：283

作者：

Kovacs, Josef Z. ^{[1
]}

Velagala, Bala S.

Schulte, Karl

Bauhofer, Wolfgang

机构：

[1] Tech Univ Hamburg, Inst Opt & Elektron Mat, D-21073 Hamburg, Germany

[2] Tech Univ Hamburg, Polymer Composites Sect, D-21073 Hamburg, Germany

来源：

COMPOSITES SCIENCE AND TECHNOLOGY | 2007年 / 67卷 / 05期

关键词：

nanostructures; polymer-matrix composites (PMCs); electrical properties;

D O I：

10.1016/j.compscitech.2006.02.037

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

The results presented in this paper reveal the first evidence that two types of percolation thresholds can coexist in an insulator-conductor-system, the higher one attributed to a static and the lower one to a kinetic network formation process. Detailed measurements at concentrations above the statistical percolation threshold show a power law dependence of conductivity on filler concentration (with an exponent of 2.7) that is independent of the processing condition. A simplified model of percolated particles was developed in order to relate the sample conductivity to the contact resistance between individual particles embedded within a polymer matrix. Our results are compared with previous studies in order to correlate the contact resistance values to different materials and processing conditions. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：922 / 928

页数：7

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