INFLUENCE OF LARGE STATIC DEFORMATIONS ON THE DYNAMIC MECHANICAL-PROPERTIES OF BROMOBUTYL RUBBER VULCANIZATES .1. EFFECT OF CARBON BLACKLOADING

The dynamic mechanical properties of bromobutyl rubber vulcanizates loaded with varying proportions of highly reinforcing carbon black (N-220) have been studied over a wide range of static extensions, using a viscoelastometer Rheovibron DDV-III-EP. The static strain and frequency range were 0-300% and 3·5-110 Hz, respectively. The dynamic strains superimposed on the static deformation were varied between 0·025% and 5% DSA at the lowest value of λ (deformation ratio). Studies on the dynamic Mullins effect (stress-softening) and dynamic relaxation have also been carried out. © 1990.