par Crowet, Colette 
;Bauwens, Jean Claude
Référence Polymer, 28, 11, page (1863-1868)
Publication Publié, 1987-10
;Bauwens, Jean Claude Référence Polymer, 28, 11, page (1863-1868)
Publication Publié, 1987-10
Article révisé par les pairs
| Résumé : | The effect of annealing mechanically rejuvenated samples of polycarbonate below Tg has been investigated by differential scanning calorimetry. All the traces exhibited a broad sub-Tg exotherm, preceded in some cases by a small sub-Tg endothermal peak. The position of the exotherm on the scan is strongly dependent on the annealing conditions. A method is proposed to obtain the value of the structural temperature characterizing any annealed rejuvenated sample, since in our opinion this is the chief quantity to be adopted in annealing investigations. Basic relations are chosen to be as simple as possible, containing only three parameters optimized using previous enthalpy relaxation data obtained on samples annealed after quenching. From the same relations, traces related to annealed rejuvenated samples are computed. The positions on the scan of calculated and experimental exotherms are compared and found to agree. Results tend to confirm that, to a first approximation, the annealing process does not depend on the sample treatment before annealing. © 1987. |
