Electrical and thermal properties of composite of liquid crystalline polymer filled with carbon black

Abstract

ABSTRACT:The electrical resistivity and thermal conductivity of a liquid crystalline polymer (LCP) filled with a commercial carbon black (CB) of various volume fractions () is investigated. The percolation threshold ( c ) is found at about 3%, and the resistivity () as a function of ( Ϫ 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 below c exhibit a negative temperature coefficient of resistivity while those above c show almost no temperature dependence from room temperature to 200°C. In addition, the samples at lower 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 . This result indicates that preferential molecular alignment of the matrix LCP is responsible for the behavior of the thermal conductivity of the composites.

Rheological, electrical, and microwave properties of polymers with nanosized carbon particles

“…One of the main features of composites filled with conductive particles is that the agglomerates of particles in the infinite cluster (particle network) are still separated by thin gaps of a polymer layer, which results in a variety of conduction mechanisms in such composites 22, 23. Because of this, factors that influence agglomeration processes will play an important role for control on the conduction mechanisms 31, 32. The variables used for controlling the agglomeration processes and the rheological properties of NCP dispersions, such as volume content [Figs.…”

Thermal Conductivity of Nanoparticles Filled Polymers

“…Carbon black is reported to contribute to electrical conductivity rather than thermal conductivity (Wong et al, 2001), (Abdel-Aal et al, 2008) and (King et al, 2006).…”

Synergistic Effects of Carbon Fillers of Phenolic Resin Based Composite Bipolar Plates on the Performance of PEM Fuel Cell

“…The addition of fixed amount of CB and GP in EG/resin composites could be helpful in providing better properties due to following reasons, viz. (i) the CB nanoparticles have better absorbing ability of phenolic resin due to their high surface, which could enhance the mechanical properties of composites significantly [33], (ii) the homogeneous distribution of GP and CB particles in EG/resin composite could improve the thermal properties of composite bipolar plates [34,35], and (iii) the highly conducting GP and CB particles can facilitate more electrical channels in phenolic resin, which leads to higher electrical conductivity of composites [2,15,36]. Here, all composite plates were made using compression molding technique.…”