Dielectric analysis of VGCNF reinforced polyethylene composites

被引：51

作者：

Yang, Shuying ^{[1
]}

Benitez, Rogelio ^{[1
]}

Fuentes, Arturo ^{[1
]}

Lozano, Karen ^{[1
]}

机构：

[1] Univ Texas Pan Amer, Dept Mech Engn, Edinburg, TX 78541 USA

来源：

COMPOSITES SCIENCE AND TECHNOLOGY | 2007年 / 67卷 / 06期

基金：

美国国家科学基金会;

关键词：

carbon nanofibres; polymer-matrix composites (PMCs); nanostructures; electrical properties; dielectric analysis;

D O I：

10.1016/j.compscitech.2006.05.022

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

Dielectric analysis was performed on vapor grown carbon nanofiber reinforced high density polyethylene (HDPE) composites. The dielectric parameters (permittivity, loss factor, tan delta and ionic conductivity) of pure HDPE and composites were obtained in a frequency range of 0.01-10(5) Hz and temperature range of 35-120 degrees C. The dielectric properties of pure HDPE are slightly dependent on temperature and frequency. Permittivity values decreased slightly with frequency and temperature while changes in loss factor and dissipation factor (tan delta) were negligible. The dielectric properties of the composites showed a strong dependence on nanofiber content, testing frequency and temperature. Permittivity, loss factor and tan delta increased with the increase of nanofiber content and decreased with increasing temperature and frequency. Percolation phenomenon was observed in the dielectric analysis, similar to the percolation in electrical conductivity studies. The threshold value for permittivity and loss factor was approximate to 15 wt% VGCNF. The ionic conductivity of the composites increased with frequency. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1159 / 1166

页数：8

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