Conductive rubber composites from different blends of ethylene-propylene-diene rubber and nitrile rubber |
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Authors: | K P SAU T K CHAKI D KHASTGIR |
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Affiliation: | (1) Rubber Technology Centre, Indian Institute of Technology, Kharagpur, 721302, India |
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Abstract: | Conductive rubber composites were derived from different blends of ethylene-propylene-diene monomer (EPDM) rubber and acrylonitrile
butadiene rubber (NBR) containing acetylene black. The electrical and mechanical properties of these composites were measured.
The percolation limit for achieving high conductivity of conductive filler depends on the viscosity of the blend. The higher
the viscosity, the higher is the percolation limit. The conductivity rises with increasing temperature, and the activation
energy of conduction increases with the decrease in the loading of conductive filler and percentage of NBR in the blend. Electrical
hysteresis and an electrical resistivity difference during the heating-cooling cycle are observed for these systems, which
is mainly due to some kind of irreversible change occurring in the conductive networks during heating. The mechanisms of conduction
of these systems were discussed in the light of different theories. It was found that the degree of reinforcement by acetylene
black in blends compares with those in the pure components NBR and EPDM. This is due to incompatibility of two elastomers
in the blend.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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