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Ultrasonic investigation of semicrystalline polymers : study of poly(ethylene terephthalate)

DOITrouver le DOI : https://doi.org/10.1016/0032-3861(91)90135-6
AuteurRechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches Canada. Institut des matériaux industriels du CNRC
FormatTexte, Article
Sujetultrasonic characterization; melting; α-relaxation; glass transition; poly(ethylene terephthalate)
Résumé
Ultrasonic velocity and attenuation were measured as functions of temperature (20 to 320°C) and hydrostatic pressure up to 900 bar at acoustic frequencies varying from 1 to 6.33 MHz on semicrystalline poly(ethylene terephthalate). Melting, α-relaxation and glass transition temperatures and their dependence on pressure were determined from the variations of ultrasonic characteristics. Comparison with very low-frequency (1–10⁻¹ Hz) dynamic mechanical spectroscopy is done in the case of α-relaxation, which can be described in terms of a Vogel-Fulcher-Tammann relation. With simultaneous specific volume measurements, glass transition temperature is determined by different methods to validate ultrasonic results. In particular, data analysis through a physical model is described to improve the method in the case of semicrystalline polymers.
Date de publication
Maison d’éditionElsevier
Dans
  • Polymer 32, nº 17 : 3147–3151.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCCNRC 33761
NRC-IMI92AP-11600-1324-G
Numéro NPARC23004682
Exporter la noticeExporter en format RIS
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Identificateur de l’enregistrementa31dc77c-96d6-4fb0-ad62-c73f944b7e07
Enregistrement créé2018-12-10
Enregistrement modifié2020-03-17

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