On the in-situ polymerization of cyclic butylene terephthalate oligomers: DSC and rheological studies

Z. A. Mohd Ishak, K. G. Gatos, J. Karger-Kocsis

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

The thermal and rheological behaviors of cyclic butylène terephthalate (CBT) were studied with differential scanning calorimetry (DSC) and plate-plate rheometry, respectively. DSC scans were taken at different heating rates. The related first-heat thermograms indicated crystallization and melting of the resulting poly (butylene terephthalate) (PBT) only at very low heating rate (0.5°C/ min). As the crystallization and melting enthalpies were closely matched, one could conclude that the polymerization is essentially athermic. The polymerization was accompanied by a steep increase of the melt viscosity in isothermal rheological tests performed in the temperature range T = 145-210°C. Changes in the viscoelasticity of the polymerizing CBT and crystallizing PBT could be best followed by considering the changes in the phase angle. Viscosity increased with the conversion exponentially in the first approximation.

Original languageEnglish
Pages (from-to)743-750
Number of pages8
JournalPolymer Engineering and Science
Volume46
Issue number6
DOIs
Publication statusPublished - Jun 2006

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Heating rate
Oligomers
Differential scanning calorimetry
Melting
Crystallization
Polymerization
Viscosity
Viscoelasticity
Enthalpy
Temperature
Hot Temperature
terephthalic acid
butylene

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry

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On the in-situ polymerization of cyclic butylene terephthalate oligomers : DSC and rheological studies. / Mohd Ishak, Z. A.; Gatos, K. G.; Karger-Kocsis, J.

In: Polymer Engineering and Science, Vol. 46, No. 6, 06.2006, p. 743-750.

Research output: Contribution to journalArticle

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