Crystallization-induced shrinkage, crystalline, and thermomechanical properties of in Situ polymerized cyclic butylene terephthalate

M. Harsch, J. Karger-Kocsis, A. A. Apostolov

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The polymerization and crystallization of cyclic butylene terephthalate oligomers (CBT) were followed by fiber Bragg grating (FBG) and normal force measurements under isothermal conditions at T = 170 and 190°C, respectively. It was found that the FBG and normal force sense only the crystallization- induced shrinkage. The course of the FBG signal and the normal force as a function of time suggested that crystallization of the polymerized CBT (pCBT) occurs in two steps. The primary crystallization-induced shrinkage is several hundreds by contrast to the secondary one showing several tens in ppm/min unit according to the FBG results. The two-step crystallization was confirmed by normal force measurements. The crystallinity and crystalline structure of the pCBTs were studied by differential scanning calorimetry and wideangle X-ray scattering. It was found that the crystallinity and the crystalline parameters slightly differ for the pCBTs formed at T = 170 and 190°C, respectively. The pCBT produced at T = 190°C had slightly higher crystallinity and more perfect crystals than the pCBT formed at T = 170°C. The reliability of the FBG sensing was checked by thermomechanical analysis (TMA). A fair agreement was established between the thermal contraction and thermal expansion measured by FBG and TMA, respectively.

Original languageEnglish
Pages (from-to)1455-1461
Number of pages7
JournalJournal of Applied Polymer Science
Volume108
Issue number3
DOIs
Publication statusPublished - Mar 5 2008

Fingerprint

Fiber Bragg gratings
Crystallization
Crystalline materials
Force measurement
Oligomers
X ray scattering
Thermal expansion
terephthalic acid
butylene
Differential scanning calorimetry
Polymerization
Crystals

Keywords

  • CBT oligomer
  • Crystallization
  • Polyesters
  • Ring-opening polymerization
  • Thermal properties

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

Crystallization-induced shrinkage, crystalline, and thermomechanical properties of in Situ polymerized cyclic butylene terephthalate. / Harsch, M.; Karger-Kocsis, J.; Apostolov, A. A.

In: Journal of Applied Polymer Science, Vol. 108, No. 3, 05.03.2008, p. 1455-1461.

Research output: Contribution to journalArticle

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