Thermoelastic Phenomena in SKS-30A and SKB Rubber Compounds in Adiabatic Deformation
Abstract 1. The stretching of vulcanizates of SKS-30A and SKB before break accompanied by the generation of heat equivalent to the work of stretching indicates the kinetic nature of the elastic forces in these vulcanizates. 2. Change in the degree of vulcanization of the compound and the addition of fillers leads only to a change in the modulus of elasticity of the rubber compound. The rules of conversion of work into heat do not change. The absence of crystallization processes even at high elongation (λ=6−7.5) is evidently a result of the irregular structure of the hydrocarbon skeleton of the original rubbers, SKS-30A and SKB. 3. For rubbers containing active fillers (channel black and silica gel) and obtained by optimum vulcanization, there is observed a decrease in heat evolution caused by hardening of the material in the region of high elongation just before break.