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

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 perc...

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Bibliographic Details
Main Authors: Singh, Jag J, Eftekhari, Abe, St Clair, Terry L, Sprinkle, Danny R
Format: Report
Language:English
Subjects:
Atomic and Molecular Physics and Spectroscopy
COOLING
CRYOGENIC TEMPERATURES
CRYOGENICS
DIFFUSION
FREE VOLUME FRACTION
KETONES
LIQUID HYDROGEN
LIQUID HYDROGEN DIFFUSION
LIQUID NITROGEN
LOW TEMPERATURE
MICROSTRUCTURE
MODIFICATION
Organic Chemistry
PEEK(POLYETHERETHER KETONE)
Physical Chemistry
POLYETHERETHER KETONE
POLYETHERS
Polymer Chemistry
POLYMERS
POSITRON LIFETIME SPECTROSCOPY
POSITRONS
REDUCTION
ROOM TEMPERATURE
SEMICRYSTALLINE
SPECTROSCOPY
TEMPERATURE
Thermodynamics
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Summary: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.