Abstract
The effects of pre-annealing ageing time at 70 °C on the electrical properties and swelling behaviour in kerosene of a new tri-block rubber based on blends of natural rubber (NR) and different concentration ratios of both styrene-butadiene rubber (SBR) and butyl rubber (IIR), all incorporating 40 phr (parts per hundred parts of rubber by weight) of high abrasion furnace (HAF) carbon black, were investigated. It was found that the interspacing distance, d, between carbon particles or aggregates is greatly affected by physical ageing and also by the rubber ratios in the test specimens. Moreover, the degree of swelling, Q (%), in kerosene was found to decrease with both physical ageing and IIR content of the specimen.
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