Crystallization Regime Behavior of Poly(pentamethylene terephthalate)

Pi Ling Wu, Eamor Woo

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Poly(pentamethylene terephthalate) (PPT), a less studied aryl polyester, was synthesized by polycondensation and characterized by 1 H NMR and gel permeation chromatography. The crystallization kinetics were investigated by means of differential scanning calorimetry and polarized light microscopy. The average value of the Avrami exponent was calculated to be 2.9, which indicated an athermal nucleation process followed by three-dimensional crystal growth. The kinetics of spherulitic growth of PPT were analyzed with the Lauritzen-Hoffman (L-H) secondary nucleation theory, and the nucleation constants (K g ) for regimes II and III were thus determined from the slope of the L-H plot with an activation energy (U*) of 3500 cal/mol. The validity of the U* value was examined. Meanwhile, the existence of a transition from regime II to regime III at 95 °C was determined, and the value of K g(III) /K g(II) was 2.04. The equilibrium melting temperature of PPT was estimated to be 149.4 °C with the linear Hoffman-Weeks extrapolation method. The lateral surface free energy, fold surface free energy, and work of chain folding were estimated. These thermodynamic properties of PPT were then compared to those of other terephthalic polyesters.

Original languageEnglish
Pages (from-to)1265-1274
Number of pages10
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume42
Issue number7
DOIs
Publication statusPublished - 2004 Apr 1

Fingerprint

pulsed plasma thrusters
terephthalate
Crystallization
Polyesters
Nucleation
crystallization
Free energy
polyesters
nucleation
Crystallization kinetics
free energy
Gel permeation chromatography
Light polarization
Polycondensation
Crystal growth
Extrapolation
gel chromatography
Optical microscopy
Melting point
Differential scanning calorimetry

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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abstract = "Poly(pentamethylene terephthalate) (PPT), a less studied aryl polyester, was synthesized by polycondensation and characterized by 1 H NMR and gel permeation chromatography. The crystallization kinetics were investigated by means of differential scanning calorimetry and polarized light microscopy. The average value of the Avrami exponent was calculated to be 2.9, which indicated an athermal nucleation process followed by three-dimensional crystal growth. The kinetics of spherulitic growth of PPT were analyzed with the Lauritzen-Hoffman (L-H) secondary nucleation theory, and the nucleation constants (K g ) for regimes II and III were thus determined from the slope of the L-H plot with an activation energy (U*) of 3500 cal/mol. The validity of the U* value was examined. Meanwhile, the existence of a transition from regime II to regime III at 95 °C was determined, and the value of K g(III) /K g(II) was 2.04. The equilibrium melting temperature of PPT was estimated to be 149.4 °C with the linear Hoffman-Weeks extrapolation method. The lateral surface free energy, fold surface free energy, and work of chain folding were estimated. These thermodynamic properties of PPT were then compared to those of other terephthalic polyesters.",
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Crystallization Regime Behavior of Poly(pentamethylene terephthalate). / Wu, Pi Ling; Woo, Eamor.

In: Journal of Polymer Science, Part B: Polymer Physics, Vol. 42, No. 7, 01.04.2004, p. 1265-1274.

Research output: Contribution to journalArticle

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