par Crowet, Colette ;Bauwens, Jean Claude
Référence Polymer, 29, 11, page (1985-1989)
Publication Publié, 1988-11
Article révisé par les pairs
Résumé : The effect of annealing below Tg on rejuvenated samples of polycarbonate has been investigated through torsional yield stress measurements. Rejuvenation was achieved by twisting thin-walled tubular specimens at constant rotation rate well beyond the yield point. The direction of twisting was reversed twice in order to obtain an hysteretic curve. Rejuvenated samples were then annealed and retested in torsion. The ratio of the shear yield stresses after and before the annealing treatment is followed as a function of the annealing conditions. Numerous data are obtained here allowing an accurate check of the response of a model previously proposed relying on the Eyring formalism and the Davies-Jones equation rewritten as a function of θ{symbol}, the structural temperature of the sample. © 1988.