The strain energy density behaviour is studied at room temperature,
for 100 phr (parts per 100 parts of rubber by weight) FEF carbon-black-loaded
styrene-butadiene rubber (SBR), natural rubber (NR), butadiene-acryle nitrial
rubber (NBR), butyl rubber (IIR) and butadiene rubber (BR). This behaviour is
also studied for 100 phr of different types of carbon-black, (intermediate
super abrasion furnace) (ISAF), high abrasion furnace (HAF), fast extrusion
furnace (FEF), semi-reinforcing furnace (SRF) and easy processing channel
(EPC)-)loaded SBR rubber vulcanizates and for different concentrations of FEF
carbon-black-loaded SBR rubber vulcanizates.
The shear modulus for all
composites is also obtained and discussed. These data are used to calculate
the strain energy density using the equation proposed by Blatz et al (1974 Trans. Soc. Rheol. 18 145-61), based on
the n-measure of Sethe.
It is found that the n-measure is still a material constant, even after the
addition of carbon black, but with higher values than that for unloaded
rubber.
SYNOPSISStyrene butadiene rubber (SBR-1502) was mixed with 100 phr superreinforcing furnace ( SRF) black. The obtained rubber vulcanizate was subjected to electrical conductivity measurements at different values of tensile deformation. The log V vs. log Z graphs showed two distinct linear stages, the slope of which is nearly independent of the tensile deformation in the first stage and decreases with tensile deformation in the second stage. On the other hand, the tensile deformation was found to have an appreciable effect on the electrical conductivity. It decreases sharply as the sample is suddenly strained and then increases exponentially with time. An empirical formula describing this behavior is suggested.
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