Crystallisation kinetics of cyclic and linear poly(butylene terephthalate)

Michael Jenkins, Stephen Kukureka, Sani Amril Samsudin

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The isothermal crystallisation kinetics of cyclic poly (butylene terephthalate) (cPBT) were analysed using a primary-limited differential Avrami analysis, and the equilibrium melting point ( TomTmo ) was determined using the Hoffman–Weeks approach. Further analysis of the kinetic data using the Hoffman–Lauritzen analysis yielded the nucleation constant (Kg) and the end surface free energies (σσe). The kinetic parameters obtained for cPBT were compared with a commercial sample of linear PBT. The Kg values of cPBT and linear PBT were observed to be 5.13 ± 0.02 × 105 K2 and 4.50 ± 0.02 × 105 K2, respectively. Meanwhile, the σσe of cPBT was calculated as 6.44 ± 0.05 × 10−4 J2 m−4 and linear PBT was 5.54 ± 0.05 × 10−4 J2 m−4.
Original languageEnglish
Pages (from-to)457-463
Number of pages7
JournalJournal of Thermal Analysis and Calorimetry
Issue number1
Early online date28 Oct 2016
Publication statusPublished - Apr 2017


  • Cyclic (butylene terephthalate) oligomers (CBT)
  • Crystallisation kinetics
  • DSC Avrami analysis
  • Equilibrium melting point
  • Hoffman–Weeks analysis


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