Comparing dielectric measurements on poly(ethylene terephthalate) at constant heating rates with isothermal measurements

Madalena Dionísio, Natália M. Alves, João F. Mano

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

In this study, dielectric relaxation spectroscopy experiments were carried out during heating in the α relaxation region of PET. The results for low heating rates were consistent with isothermal measurements. Moreover, the results expressed as a function of temperature were much clearer than those expressed as a function of frequency. However, the loss peaks obtained in these non-isothermal experiments showed a systematic shift on the temperature axis when the heating rate increased. A significant but nearly constant thermal lag was observed in experiments with heating at 1 K min-1 when using different equipment. It appears that isothermal data obtained in a well calibrated apparatus can be used to adjust the temperature axis of dielectric results obtained in ramp temperature experiments. (C) 1999 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)2675-2679
Number of pages5
JournalPolymer
Volume40
Issue number10
DOIs
Publication statusPublished - May 1999

Keywords

  • α relaxation
  • Heating mode experiments
  • Poly(ethylene terephthalate)

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