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

reportActive / Technical Report | Accession Number: ADA310439 | Open PDF

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.

Author(s):
Singh, Jag J. ; Eftekhari, Abe ; St Clair, Terry L. ; Sprinkle, Danny R.
Author Organization(s):
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
Descriptive Note:
Technical paper,
Pagination:
0013

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NASA-L-16841, NASA-TP-3064
Monitor Series:
XD
 Subject Terms
Joint Capability Areas:
JCA_6_Net Centric; JCA_6.3.3_Spectrum Management; JCA_6.4.1_Secure Information Exchange; JCA_6.3_Net Management; JCA_6.4_Information Assurance
Communities of Interest:
Air Platforms
Descriptor(s):
*TEMPERATURE, *MICROSTRUCTURE, *SPECTROSCOPY, *MODIFICATION, *CRYOGENICS, *POLYETHERS, *KETONES, *POSITRONS, LOW TEMPERATURE, POLYMERS, FILMS, COOLING, ROOM TEMPERATURE, REDUCTION, DIFFUSION, LIQUID HYDROGEN, LIQUID NITROGEN
Field(s)/Group(s):
Polymer Chemistry, Organic Chemistry, Physical Chemistry, Atomic and Molecular Physics and Spectroscopy, Thermodynamics
Keyword(s):
*POLYETHERETHER KETONE, PEEK(POLYETHERETHER KETONE), POSITRON LIFETIME SPECTROSCOPY, SEMICRYSTALLINE, CRYOGENIC TEMPERATURES, FREE VOLUME FRACTION, LIQUID HYDROGEN DIFFUSION
Report Date:
1991 Mar 01
Creation Date:
1996 Aug 07