Melting and crystallization of in-situ polymerized cyclic butylene terephthalates with and without organoclay

A modulated DSC study

J. Karger-Kocsis, P. P. Shang, Z. A. Mohd Ishak, M. Rösch

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The polymerization of cyclic butylene terephthalate oligomers (CBT) were studied in presence (in 5 wt.%) and absence of an organoclay (Cloisite® 30B) by modulated DSC (MDSC). The organoclay containing samples were produced by dry and melt blending, respectively. The first heating, causing the polymerization of the CBT catalyzed by an organotin compound, was followed by cooling prior to the second heating. The MDSC scans covered the temperature interval between 0 and 260°C. The aim of this protocol was to study the crystallization and melting behavior of the resulting polybutylene terephthalate (pCBT) and its organoclay modified nanocomposites. It was found that the thermal behaviors of the polymerizing and polymerized CBT (pCBT) were strongly affected by the sample preparation. The organoclay suppressed the crystallization of the pCBT produced during the first heating. However, results from the second heating suggest that more perfect crystallites were formed in the organoclay modified pCBT variants. The organoclay also affected the conversion and mean molecular mass of the resulting pCBT which were slightly lower than those of the plain pCBT polymerized under identical conditions.

Original languageEnglish
Pages (from-to)60-68
Number of pages9
JournalExpress Polymer Letters
Volume1
Issue number2
DOIs
Publication statusPublished - Feb 2007

Fingerprint

terephthalate
Organoclay
butenes
Crystallization
Melting
oligomers
melting
crystallization
heating
Oligomers
Heating
polymerization
Organotin Compounds
plains
Polymerization
crystallites
nanocomposites
Molecular mass
intervals
Crystallites

Keywords

  • Crystallization and melting
  • Cyclic butylene terephthalate (CBT)
  • Modulated DSC
  • Organoclay
  • Thermal properties

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry
  • Chemical Engineering(all)
  • Organic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Melting and crystallization of in-situ polymerized cyclic butylene terephthalates with and without organoclay : A modulated DSC study. / Karger-Kocsis, J.; Shang, P. P.; Mohd Ishak, Z. A.; Rösch, M.

In: Express Polymer Letters, Vol. 1, No. 2, 02.2007, p. 60-68.

Research output: Contribution to journalArticle

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