Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27055
Title: Electrical and thermal properties of composite of liquid crystalline polymer filled with carbon black
Authors: Wong, YW
Lo, KL
Shin, FG
Keywords: Anisotropic properties
Carbon black
Electrical resistivity
Liquid crystalline polymer
Thermal conductivity
Issue Date: 2001
Publisher: John Wiley & Sons
Source: Journal of applied polymer science, 2001, v. 82, no. 6, p. 1549-1555 How to cite?
Journal: Journal of applied polymer science 
Abstract: The electrical resistivity and thermal conductivity of a liquid crystalline polymer (LCP) filled with a commercial carbon black (CB) of various volume fractions (φ) is investigated. The percolation threshold (φ c) is found at about 3%, and the resistivity (ρ) as a function of (φ - φ c) satisfies the exponential function. Although the pure LCP is highly anisotropic in thermal and mechanical properties after processing, the composite samples exhibit no preferential direction for electrical conduction. Samples of φ below φ c exhibit a negative temperature coefficient of resistivity while those above φ c show almost no temperature dependence from room temperature to 200°C. In addition, the samples at lower φ have higher thermal conductivity in the LCP flow direction than those measured in the transverse and thickness directions, and they approach the same value at higher φ. This result indicates that preferential molecular alignment of the matrix LCP is responsible for the behavior of the thermal conductivity of the composites.
URI: http://hdl.handle.net/10397/27055
ISSN: 0021-8995
EISSN: 1097-4628
DOI: 10.1002/app.1993
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