skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Spectroscopic comparison of effects of electron radiation on mechanical properties of two polyimides

Abstract

The differences in the radiation durabilities of two polyimide materials, Du Pont Kapton and General Electric Ultem, are compared. An explanation of the basic mechanisms which occur during exposure to electron radiation from analyses of infrared (IR) and electron paramagnetic resonance (EPR) spectroscopic data for each material is provided. The molecular model for Kapton was, in part, established from earlier modeling for Ultem (pp. 1293-1298 of IEEE Transactions on Nuclear Science, December 1984). Techniques for understanding the durability of one complex polymer based on the understanding of a different and equally complex polymer are demonstrated. The spectroscopic data showed that the primary radiation-generated change in the tensile properties of Ultem (a large reduction in tensile elongation) was due to crosslinking, which followed the capture by phenyl radicals of hydrogen atoms removed from gem-dimethyl groups. In contrast, the tensile properties of Kapton remained unchanged because radical-radical recombination, a self-mending process, took place.

Authors:
;
Publication Date:
Research Org.:
National Aeronautics and Space Administration, Hampton, VA (USA). Langley Research Center
OSTI Identifier:
6543192
Report Number(s):
N-87-18611; NASA-TP-2663; L-16200; NAS-1.60:2663
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IMIDES; PHYSICAL RADIATION EFFECTS; POLYMERS; COMPARATIVE EVALUATIONS; ELECTRON BEAMS; EXPERIMENTAL DATA; TENSILE PROPERTIES; BEAMS; DATA; INFORMATION; LEPTON BEAMS; MECHANICAL PROPERTIES; NUMERICAL DATA; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PARTICLE BEAMS; RADIATION EFFECTS; 360605* - Materials- Radiation Effects

Citation Formats

Long, Jr, E R, and Long, S A.T. Spectroscopic comparison of effects of electron radiation on mechanical properties of two polyimides. United States: N. p., 1987. Web.
Long, Jr, E R, & Long, S A.T. Spectroscopic comparison of effects of electron radiation on mechanical properties of two polyimides. United States.
Long, Jr, E R, and Long, S A.T. Wed . "Spectroscopic comparison of effects of electron radiation on mechanical properties of two polyimides". United States.
@article{osti_6543192,
title = {Spectroscopic comparison of effects of electron radiation on mechanical properties of two polyimides},
author = {Long, Jr, E R and Long, S A.T.},
abstractNote = {The differences in the radiation durabilities of two polyimide materials, Du Pont Kapton and General Electric Ultem, are compared. An explanation of the basic mechanisms which occur during exposure to electron radiation from analyses of infrared (IR) and electron paramagnetic resonance (EPR) spectroscopic data for each material is provided. The molecular model for Kapton was, in part, established from earlier modeling for Ultem (pp. 1293-1298 of IEEE Transactions on Nuclear Science, December 1984). Techniques for understanding the durability of one complex polymer based on the understanding of a different and equally complex polymer are demonstrated. The spectroscopic data showed that the primary radiation-generated change in the tensile properties of Ultem (a large reduction in tensile elongation) was due to crosslinking, which followed the capture by phenyl radicals of hydrogen atoms removed from gem-dimethyl groups. In contrast, the tensile properties of Kapton remained unchanged because radical-radical recombination, a self-mending process, took place.},
doi = {},
url = {https://www.osti.gov/biblio/6543192}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {4}
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share: