Abstract
The strain energy density behaviour is studied at room temperature,for 100 phr (parts per 100 parts of rubber by weight) FEF carbon-black-loadedstyrene-butadiene rubber (SBR), natural rubber (NR), butadiene-acryle nitrialrubber (NBR), butyl rubber (IIR) and butadiene rubber (BR). This behaviour isalso studied for 100 phr of different types of carbon-black, (intermediatesuper abrasion furnace) (ISAF), high abrasion furnace (HAF), fast extrusionfurnace (FEF), semi-reinforcing furnace (SRF) and easy processing channel(EPC)-)loaded SBR rubber vulcanizates and for different concentrations of FEFcarbon-black-loaded SBR rubber vulcanizates.The shear modulus for allcomposites is also obtained and discussed. These data are used to calculatethe strain energy density using the equation proposed by Blatz et al (1974 Trans. Soc. Rheol. 18 145-61), based onthe n-measure of Sethe.It is found that the n-measure is still a material constant, even after theaddition of carbon black, but with higher values than that for unloadedrubber.
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