Thermal Properties of Melt-Blended Poly(ether ether ketone) and Poly(ether imide)

Yong Sung Chun, Heon Sang Lee, Hyun Chul Jung, Woo Nyon Kim

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


The thermal properties of blends of poly(ether ether ketone) (PEEK) and poly(ether imide) (PEI) prepared by screw extrusion were investigated by differential scanning calorimetry. From the thermal analysis of amorphous PEEK-PEI blends which were obtained by quenching in liquid nitrogen, a single glass transition temperature (Tg) and negative excess heat capacities of mixing were observed with the blend composition. These results indicate that there is a favorable interaction between the PEEK and PEI in the blends and that there is miscibility between the two components. From the Lu and Weiss equation and a modified equation from this work, the polymerpolymer interaction parameter (X12) of the amorphous PEEK-PEI blends was calculated and found to range from -0.058 to -0.196 for the extruded blends with the compositions. The X12 values calculated from this work appear to be lower than the X12 values calculated from the Lu and Weiss equation. The X12 values calculated from the Tg method both ways decreased with increase of the PEI weight fraction.

Original languageEnglish
Pages (from-to)733-739
Number of pages7
JournalJournal of Applied Polymer Science
Issue number6
Publication statusPublished - 1999 May 9


  • Blend
  • Glass transition temperature
  • Poly(ether ether ketone)
  • Poly(ether imide)
  • Polymer-polymer interaction parameter

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry


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