Abstract
The positron annihilation lifetime technique (PAL) has been applied to investigate the behaviour of the free volume (size and concentration) in butyl rubber (IIR) as a function of the concentration of semi-reinforcing furnace (SRF) carbon black. An attempt is to establish a correlation between the macroscopic mechanical and electrical properties of rubber and the microscopic properties of the free volume holes. The dependence of the size and the fraction of free volume in rubber on the concentration of SRF carbon black has been discussed on the basis of the free volume model.
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