DSC analysis was performed on uniaxially oriented and unoriented atactic polystyrene samples prior to and after annealing at 80 °C. With increasing annealing times, an endothermic peak appeared, whose area increased with the duration of the annealing period. No difference was found between the endotherm areas for the oriented and the unoriented polymer. The DSC curve of the unannealed oriented polystyrene exhibited a relaxation exotherm. DSC and relaxation studies indicated that this relaxation exotherm was independent of the main chain orientation; it may rather be due to sample densification.
On the sub-Tg annealing of uniaxially oriented and unoriented atactic polystyrene / Carfagna, Cosimo; L., Nicodemo; L., Nicolais. - In: JOURNAL OF THERMAL ANALYSIS. - ISSN 0368-4466. - 31:(1986), pp. 597-603. [10.1007/BF01914237]
On the sub-Tg annealing of uniaxially oriented and unoriented atactic polystyrene
CARFAGNA, COSIMO;
1986
Abstract
DSC analysis was performed on uniaxially oriented and unoriented atactic polystyrene samples prior to and after annealing at 80 °C. With increasing annealing times, an endothermic peak appeared, whose area increased with the duration of the annealing period. No difference was found between the endotherm areas for the oriented and the unoriented polymer. The DSC curve of the unannealed oriented polystyrene exhibited a relaxation exotherm. DSC and relaxation studies indicated that this relaxation exotherm was independent of the main chain orientation; it may rather be due to sample densification.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
