Quantitative nanoscale measurements of the thermomechanical properties of poly-ether-ether-ketone (PEEK)

Wen Qian, Wenlong Li, Charles Nguyen, Tyler J. Johnson, Joseph A. Turner

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Understanding the internal structure and organization of semicrystalline polymers, especially at the nanoscale, has many challenges for researchers to date. In this article, we demonstrate a quantitative method for investigating the local viscoelastic properties (i.e., storage and loss moduli, as well as loss tangent) of semicrystalline polyether-ether ketone (PEEK) through the combination of contact resonance atomic force microscopy (CR-AFM) and in situ local heating with a thermal probe. Furthermore, the local viscoelastic properties of the crystalline and amorphous phases were decoupled by performing thermal CR-AFM array mapping near the glass transition temperature of PEEK (Tg, 143 °C). A distinct bimodal distribution of tip-sample interaction was observed for PEEK near its Tg, providing a means to estimate the Tg and the degree of crystallinity of PEEK.

Original languageEnglish (US)
Pages (from-to)1544-1552
Number of pages9
JournalJournal of Polymer Science
Issue number11
StatePublished - Jun 1 2020


  • PEEK
  • atomic force microscope
  • contact resonance
  • local probe heating
  • localized mechanical property

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics
  • Physical and Theoretical Chemistry


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