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

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1016/0032-3861(91)90135-6
AuthorSearch for: 1; Search for: 1
Affiliation
  1. National Research Council of Canada. NRC Industrial Materials Institute
FormatText, Article
Subjectultrasonic characterization; melting; α-relaxation; glass transition; poly(ethylene terephthalate)
Abstract
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.
Publication date
PublisherElsevier
In
  • Polymer 32, no. 17: 3147–3151.
LanguageEnglish
Peer reviewedYes
NRC numberCNRC 33761
NRC-IMI92AP-11600-1324-G
NPARC number23004682
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Record identifiera31dc77c-96d6-4fb0-ad62-c73f944b7e07
Record created2018-12-10
Record modified2020-03-17
Date modified: