Investigation of Microstructural Changes in Polyetherether-Ketone Films at Cryogenic Temperatures by Positron Lifetime Spectroscopy.

Abstract

Microstructural changes in polyetherether-ketone (PEEK) films have been investigated in the temperature range of 23 deg C to -196 deg C by using positron lifetime spectroscopy. It has been determined that the total free volume decreases by about 46 percent in amorphous PEEK samples and about 36 percent in semicrystalline PEEK samples when they are cooled from room temperature to the temperature of liquid nitrogen. If this trend in reduction of free volume with decreasing temperature continues, as expected, PEEK should be able to withstand cooling to the temperature of liquid hydrogen without any detrimental effect on its diffusivity for liquid hydrogen.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1991
Accession Number
ADA310439

Entities

People

  • Abe Eftekhari
  • Danny R. Sprinkle
  • Jag J. Singh
  • Terry L. St. Clair

Organizations

  • Langley Research Center

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Composite Materials
  • Detectors
  • Fiber Reinforced Composites
  • Films
  • Glass Transition Temperature
  • Hydrogen
  • Liquid Hydrogen
  • Materials
  • Measurement
  • Positrons
  • Schematic Diagrams
  • Spectra
  • Spectroscopy
  • Thermoplastic Resins
  • Thick Films
  • Transition Temperature
  • Virginia

Readers

  • Polymer Science and Engineering.
  • Thermal Physics or Thermal Science.
  • Thin Film Deposition Science.