Utilisation de l'analyse viscoélastique dynamique à l'étude de la cristallisation isotherme du poly(téréphtalate d'ethylène) amorphe. Application à des composites unidirectionnels avec fibres de verre

Dynamic viscoelastic analysis was used to continuously follow the “cold crystallisation” of poly(ethylene terephthalate) (PET) test bars. Samples which were cut from an amorphous PET sheet were heated to a given temperature in a hot cell. The evolution of the real part of the modulus not only allows the kinetic crystallisation parameters but also the nucleation and growth characteristics to be determined. This method was applied to unidirectional PET/glass fibre composite strips. Thus, the influence of the glass fibres on the morphological and kinetic characteristics of the matrix crystallisation has been investigated.