ESR Measurements of Vulcanized Rubber under Tensile Deformation

Changes in the Network Structure of Vulcanizates during Tensile Deformation

“…This is supported by the observation that, in the course of strain recovery, radical concentration decreases with strain recovery. Figure 7 shows the relation between the radical concentration retained (as a percentage of the radical concentration directly after attainment of 25% strain) and holding time [6], obtained from ESR measurements at fixed time intervals on PD and PS specimens stretched to 200% at 10 mm/min, allowed to recover to 25% strain and then held at that strain. Disappearance of radicals due to reaction predominates over formation of radicals during strain recovery.…”

“…In attempting to solve this problem, we connected a laboratory-built uniaxial elongation machine to a commercial ESR unit and explored ESR measurement under stretching deformation [6]. This article first outlines the equipment and method of measurement and goes on to review some of the data obtained.…”