Dynamic mechanical relaxation properties of poly(ether ether ketone)

R. K. Krishnaswamy, D. S. Kalika

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


The influence of crystalline morphology on the dynamic mechanical relaxation properties of poly(ether ether ketone) (PEEK) has been investigated for the glass-rubber (α) and sub-glass (β) relaxations; a series of both cold-crystallized and melt-crystallized specimens were examined. The presence of crystallinity had a marked influence on the glass-rubber relaxation characteristics of PEEK owing to the relative constraint imposed on the amorphous-phase motions by the crystallites. Above Tg, a progressive relaxation of rigid amorphous-phase material was evident, as well as a small incremental decrease in modulus reflecting the onset of the low-temperature melting component. The sub-glass mechanical relaxation was bimodal, comprising a lower-temperature β1 component, which originated in the bulk of the amorphous material, and a higher-temperature β2 component, which originated in organized regions of the amorphous phase (i.e. at the crystal-amorphous interphase). Both the dynamic mechanical and corresponding dielectric results displayed morphological sensitivity in the β relaxation region, with the mechanical results encompassing motions of a more complex (i.e. cooperative) nature.

Original languageEnglish
Pages (from-to)1157-1165
Number of pages9
Issue number6
StatePublished - Mar 1994


  • dynamic mechanical relaxation
  • poly(ether ether ketone)
  • semicrystalline morphology

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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