Thermal conductivity of poly(ether ether ketone) and its short‐fiber composites

C. L. Choy, Kin Wing Kwok, W. P. Leung, Felix P. Lau

Research output: Journal article publicationJournal articleAcademic researchpeer-review

45 Citations (Scopus)


The effects of crystallinity, orientation, and short‐fiber filler on the thermal diffusivity D and thermal conductivity K of poly (ether ether ketone) (PEEK) have been studied. Below the glass transition, D increases by less than 10% as the crystallinity increases from 0 to 0.3. For amorphous PEEK, there is an abrupt drop in D at the glass transition (Tg⋍ 420 K). The drop is less prominent for the 30% crystalline sample and occurs at 20 K higher. At a draw ratio of 2.5, the axial thermal conductivity is 2.3 times higher while the transverse thermal conductivity is 30% lower than that of the unoriented material. For an injection‐molded bar of carbon fiber reinforced PEEK, the variation of D with position along the width or thickness direction is found to correlate well with the fiber orientation. By regarding the injection‐molded bar as a multidirectional laminate comprising a large number of unidirectional plies, the thermal conductivities along the longitudinal and transverse direction are calculated and found to agree closely with the experimental data.
Original languageEnglish
Pages (from-to)1389-1397
Number of pages9
JournalJournal of Polymer Science Part B: Polymer Physics
Issue number8
Publication statusPublished - 1 Jan 1994
Externally publishedYes


  • poly (ether ether ketone)
  • short‐fiber composites
  • thermal conductivity

ASJC Scopus subject areas

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


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