DYNAMIC MECHANICAL-PROPERTIES OF A CARBON-BLACK LOADED BUTYL RUBBER VULCANIZATE AND A CARBON-BLACK LOADED POLYISOBUTYLENE

This paper is intended to be one of a series on dynamic mechanical properties of a variety of carbon black-loaded compounds over wide ranges of frequency and temperature. It describes results for a vulcanized butyl rubber loaded with a medium processing channel black, and the almost chemically identical linear polymer polyisobutylene loaded with a semireinforcing furnace black; these results are compared with previously published data for vulcanized butyl gum and pure polyisobutylene. The shear strain amplitude in these measurements is very small, of the order of 10** minus **5 to 10** minus **7, in a range of linear viscoelasticity as confirmed by sensitive tests, and thus the Mullins effect is avoided.