Dynamic relaxation behavior of solvent‐crystallized poly(ether ether ketone)

D. S. Kalika, J. C. Nickell, R. K. Krishnaswamy, B. F. Barton

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The dynamic relaxation behavior of solvent‐crystallized poly(ether ether ketone) (PEEK) has been investigated in the region of the glass‐rubber (α) relaxation using dynamic mechanical and dielectric methods. Amorphous PEEK films were exposed to saturated methylene chloride and acetone vapor, with solvent‐induced crystallization observed for both penetrants. Sample desorption at elevated temperatures (under vacuum) resulted in virtually complete removal of residual penetrant, thus providing for the measurement of relaxation characteristics independent of plasticization. Both dynamic mechanical and dielectric studies indicated a marked positive offset in the isochronal relaxation temperatures of the solvent‐crystallized samples relative to thermally crystallized specimens of comparable bulk crystallinity, and a higher apparent activation energy in the solvent‐crystallized case. These results are consistent with the evolution of a tighter crystalline morphology (i.e., smaller crystal long spacing) in the solvent‐crystallized samples, the crystallites imposing a greater degree of constraint on the long‐range motions of the amorphous chains inherent to the glass‐rubber relaxation. © 1994 John Wiley & Sons, Inc.

Original languageEnglish
Pages (from-to)759-770
Number of pages12
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume32
Issue number4
DOIs
StatePublished - Mar 1994

Keywords

  • dielectric relaxation of PEEK
  • dynamic mechanical thermal analysis of PEEK
  • Poly(ether ether ketone) [PEEK]
  • solvent‐induced crystallization in

ASJC Scopus subject areas

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

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