Effects of solvent treatment on cold crystallization behavior and morphology of poly(ether ether ketone)

Eamor M. Woo, Wei J. Chang, Chia H. Hong, Chuh Y. Chen

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2 Citations (Scopus)

Abstract

Isothermal crystallization kinetics at temperatures between 160-194°C and the morphology of virgin and solvent-treated poly(ether ether ketone) (PEEK) were investigated by using differential scanning calorimetry, scanning electron microscopy (SEM), and wide-angle X-ray scattering analysis. Kinetic analysis showed that the cold crystallization of virgin (untreated) PEEK proceeds with an Avrami exponent of n = 2,5-2,6, and the SEM results revealed a grainy-texture morphology with no regular spherulites, suggesting a planar growth. The X-ray characterization revealed low to medium crystallinity, which is consistent with the SEM results. This is quite different from the typical impinged spherulitic morphology of high crystallinity in melt-crystallized PEEK. Post cold-crystallization annealing at temperatures near the melting point (300-320°C), however, induced a spherulitic morphology resembling that produced from melt crystallization. Furthermore, methylene dichloride treatment on PEEK was found to significantly affect the cold-crystallization kinetics and the resulting morphology. The cold crystallization of solvent-desorbed PEEK samples proceeds with n = 1,0-1,2, reflecting probably an irregular line growth with heterogeneous nucleation. Additionally, SEM examination revealed a highly porous texture in the desorbed/cold-crystallized PEEK that hindered direct observation of the actual crystalline morphology; nevertheless, neither spherulites nor planar lamellar crystals were observed.

Original languageEnglish
Pages (from-to)2359-2371
Number of pages13
JournalMacromolecular Chemistry and Physics
Volume197
Issue number7
DOIs
Publication statusPublished - 1996 Jul

All Science Journal Classification (ASJC) codes

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

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