Journal of Materials Science

, Volume 32, Issue 21, pp 5717–5724 | Cite as

Conductive rubber composites from different blends of ethylene-propylene-diene rubber and nitrile rubber

  • K. P SAU
  • T. K CHAKI


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.


Conductive Network Carbon Black Particle Volume Resistivity Rubber Matrix Acetylene Black 


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Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • K. P SAU
    • 1
  • T. K CHAKI
    • 1
    • 1
  1. 1.Rubber Technology CentreIndian Institute of TechnologyKharagpurIndia

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