Gas sensitivity of carbon black/waterborne polyurethane composites

被引：98

作者：

Chen, SG

Hu, JW

Zhang, MQ ^{[1
]}

Li, MW

Rong, MZ

机构：

[1] Zhongshan Univ, Inst Mat Sci, Guangzhou 510275, Peoples R China

[2] Zhongshan Univ, Minist Educ, Key Lab Polymer Composite & Funct Mat, Guangzhou 510275, Peoples R China

[3] Chinese Acad Sci, Guangzhou Inst Chem, Guangzhou 510650, Peoples R China

来源：

CARBON | 2004年 / 42卷 / 03期

基金：

中国国家自然科学基金;

关键词：

carbon black; mixing; diffusion; electrical properties;

D O I：

10.1016/j.carbon.2004.01.002

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The synthesis of conductive composites consisting of waterborne polyurethane (WPU) and carbon black (CB) is reported. Besides the low percolation threshold (0.7-0.95 wt%), the composites are quite sensitive to organic solvent vapors regardless of their polarities as characterized by the drastic changes in conductivity. In the case of polar solvents, negative and positive vapor coefficient phenomena of the composites were successively observed with a rise in CB content. It was found that different mechanisms are responsible for the broad applicability of the composites as candidates for gas sensing materials owing to the different interactions among the matrix polymer, the filler particles and the solvent molecules. (C) 2004 Elsevier Ltd. All rights reserved.

引用

收藏

页码：645 / 651

页数：7

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