Numéro de la revue: Volume 29 , Numéro 2
Auteurs: Khemis1, S. Debili1, F. jomni2 and A. Gasmi1
1Laboratoire LPS, Département de Physique, Facultés des Sciences,
Université Badji Mokhtar BP 12,23000 Annaba, Algérie.
2Laboratoire LMOP, Département de Physique, Faculté des Sciences,
Université de Tunis El Manar Tunis, Tunisie.
ABSTRACT
Dielectric and Dynamic Mechanical Spectroscopy, as well as Differential Scanning Calorimetry measurements associated with X-ray diffraction (XRD), were conducted on PVDF films. Several mechanical and dielectric relaxations were observed at approximately -48°C, 84°C and -42°C, 13°C respectively, at a frequency of 1 Hz in unstretched PVDF film. The main objective of this study was to compare the β and α mechanical relaxations and enhance the understanding of the structural changes that occur in the crystalline phase during stretching at various temperatures. Reorientation of the chains and an increase in the degree of crystallinity were observed with stretching at different temperatures.
Keywords:
Polymer ,PVDF , Relaxation DSC , XRD.