Temperature Dependent Electrical Properties of Conductive Composites (Behavior at Cryogenic Temperature and High Temperatures)

M. Rahaman; Tapan Kumar Chaki; D. Khastgir

doi:10.4028/www.scientific.net/AMR.123-125.447

Paper Titles

Preparation and Nanomechanical Characterisation of Metal Containing Amorphous Hydrogenated Carbon Nanocomposite Films
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Self-Organization of Macromolecules in Novel TPU-Clay Nanocomposites
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Small Punch Test of LC4/SiC_p Metal Matrix Composites
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Study on Design and Evaluation Method for Transport Packaging Protection
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Temperature Dependent Electrical Properties of Conductive Composites (Behavior at Cryogenic Temperature and High Temperatures)
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Thermal Relaxations of Polymers Revealed by Reversing and Non-Reversing Coefficient of Thermal Expansion
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Study of Static Characteristics of Delaminated Composite Conoidal Shell Subjected to Point Load
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Development of Advance Thermal Barrier Coating in Gas Turbine
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Effect of Process Condition in the Centrifugal Casting on the Mechanical Behavior of Cr Heat Resisting Steel
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 123-125Temperature Dependent Electrical Properties of...

Temperature Dependent Electrical Properties of Conductive Composites (Behavior at Cryogenic Temperature and High Temperatures)

Abstract:

Extrinsically conductive polymer composites can be developed by incorporation of conductive filler in suitable polymer matrix. The formation of conductive network in insulating matrix due to filler aggregation at and above percolation is responsible for electrical conductivity of such composites. The present investigation deals with effect of temperature on conductive composites made from different blends of Ethylene-Vinyl copolymer (EVA) and Acrylonitrile-Butadiene copolymer (NBR) filled with particulate carbon filler. The electrical properties of these composites depend on blend composition and filler loading. High temperature (303-393K) DC-resistivity against temperature for EVA and EVA blends composites show positive coefficient of temperature (PCT effect) followed by negative coefficient of temperature (NCT effect) thus passing through a maxima which corresponds to crystalline melting temperature(~348K) of EVA phase. Further the variation of conductivity during heating cooling cycle does not coincides and leads to some kind of thermal hysteresis due to change in conductive network structure. However in low temperature region (10-300K), the resistivity is found to increase with decrease in temperature (NCT effect) and hysteresis effect is also marginal compared to that observed in high temperature region. This difference resistivity/conductivity vs temperature behavior in two different temperature zones suggests that different two mechanisms are operative in the system.