Factors affecting electrical conductivity of carbon black‐loaded rubber. I. Effect of milling conditions and thermal‐oxidative aging on electrical conductivity of haf carbon black‐loaded styrene–butadiene rubber

Styrene–butadiene rubber (SBR‐1502) loaded with 50 phr carbon black (HAF) was prepared. The electrical conductivity of rubber vulcanizates was measured. It was found that milling conditions have a marked effect on the temperature dependence of the electrical conductivity σ( T ) of test samples. In this case, the resistivity of prepared samples increases with remilling and has a minimum value on the σ( T ) curve. Thermal‐oxidative aging of such vulcanizates decreases the conductivity of the prepared samples.