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Relation between the compression yield stress and the mechanical loss peak of bisphenol-A-polycarbonate in the β transition range

par Bauwens, Jean Claude
Référence Journal of Materials Science, 7, 5, page (577-584)
Publication Publié, 1972-05

Article révisé par les pairs

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Résumé :

The compression yield behaviour of polycarbonate, at constant strain-rate, over a wide range of temperatures, is described by the Ree-Eyring theory of non-Newtonian viscosity linked with a treatment which takes into account a distribution function of activation energies. The proposed yield mechanism relies on the assumption that the β process considered in the Ree-Eyring theory and the loss peak revealed by oscillatory measurements are related to the same molecular movements. A relation is given between the β transition conditions in yield measurements and in damping tests; its validity is checked. The broadness and the shape of the β loss peak are correlated with a spectrum of activation energies. The compression yield-stress curve, giving the yield stress versus temperature at constant strain-rate, is computed from the measurements of the loss tangent, as a function of temperature, at the frequency corresponding to the strain-rate and is found to fit the data fairly well. © 1972 Chapman and Hall Ltd.