Enthalpy relaxation in poly(ethylene terephthalate) and related polyesters

E.A. McGonigle, S.D. Jenkins, J.J. Liggat, R.A. Pethrick

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Enthalpic relaxation data are presented on poly(ethylene terephthalate), poly(ethylene naphthalate) and their copolymers. Analysis of these data allows the determination of the amount of energy absorbed at the glass transition, Qt, and the location of the enthalpic recovery peak, Tmax, as a function of the time of ageing of the samples. Ageing measurements were carried out for periods of up to 2016 h and at temperatures between 40 °C and 110 °C, depending upon the chemical composition of the system being investigated. The enthalpic relaxation rates are influenced by the chemical structure and reflect the effects of local order pinning the chains and influencing the rate of enthalpic recovery.
Original languageEnglish
Pages (from-to)1458-1463
Number of pages5
JournalPolymer International
Issue number11
Publication statusPublished - Nov 2000


  • poly(ethylene terephthalate)
  • poly(ethylene naphthalate)
  • copolymers
  • physical ageing
  • enthalpy relaxation
  • DSC
  • relaxation pinning


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