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Significant Ultra-low Percolation Threshold, Enhanced Positive Temperature Coefficient Effect and Dielectric Permittivity in Polymer-based Composites with Immiscible Polymers

Published online by Cambridge University Press:  01 February 2011

Haiping Xu ,
Naici Bing ,
Yihua Wu ,
Dandan Yang  and
Zhimin Dang
Haiping Xu
Affiliation:
hpxu@eed.sspu.cntyxhp@163.com, Shanghai Second Polytechnic University, School of Urban Development and Environmental Engineering, Shanghai, China
Naici Bing
Affiliation:
ncbing@eed.sspu.cn, Shanghai Second Polytechnic University, School of Urban Development and Environmental Engineering, Shanghai, China
Yihua Wu
Affiliation:
yhwu@eed.sspu.cn, Shanghai Second Polytechnic University, School of Urban Development and Environmental Engineering, Shanghai, China
Dandan Yang
Affiliation:
ddyang@eed.sspu.cn, Shanghai Second Polytechnic University, School of Urban Development and Environmental Engineering, Shanghai, China
Zhimin Dang
Affiliation:
zmdang@buct.edu.cn, Beijing University of Chemical Technology, Beijing, China
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Abstract

Significant conductive polymer-based composites consisting of immiscible semi-crystalline polymers PP and PVDF, at different volume ratios loaded with a certain concentration of CB were prepared by blending and sequent hot-pressing technology. The distributing status of CB in the polymers was evaluated through the micrographs of the composite. The percolation threshold of this kind of composite is much lower than those of the individual polymers. Even more, the composite at 1/1 volume ratio of PP and PVDF displays the best conductivity among different ratios at a certain concentration of CB, and it displays an outstanding PTC effect more than five orders of magnitude, and synchronously an enhanced dielectric permittivity about 24.9 at 100 Hz. These inimitable properties may owe to the formation of PP/PVDF co-continuous phases and a double-percolation effect in the composite. The novel polymer-based composite with ultra-low percolation threshold, enhanced PTC effect, as well as the significant dielectric permittivity is promising a potential application.

Keywords

compositedielectric propertieselectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1269: Symposium FF – Polymer Materials and Membranes for Energy Devices , 2010 , 1269-FF04-02
Copyright
Copyright © Materials Research Society 2010

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References

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