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Synchrontron VUV and Soft X-Ray Radiation Effects on Aluminized Teflon FEPSurfaces of the aluminized Teflon FEP multi-layer thermal insulation on the Hubble Space Telescope (HST) were found to be cracked and curled in some areas at the time of the second servicing, mission in February 1997, 6.8 years after HST was deployed in low Earth orbit (LEO). As part of a test program to assess environmental conditions which would produce embrittlement sufficient to cause cracking of Teflon on HST, samples of Teflon FEP with a backside layer of vapor deposited aluminum were exposed to vacuum ultraviolet (VUV) and soft x-ray radiation of various energies using facilities at the National Synchrotron Light Source. Brookhaven National Laboratory. Samples were exposed to synchrotron radiation of narrow energy bands centered on energies between 69 eV and 1900 eV. Samples were analyzed for ultimate tensile strength and elongation. Results will be compared to those of aluminized Teflon FEP retrieved from HST after 3.6 years and 6.8 years on orbit and will he referenced to estimated HST mission doses of VUV and soft x-ray radiation.
Document ID
19990008861
Document Type
Technical Memorandum (TM)
Authors
Dever, Joyce A. (NASA Lewis Research Center Cleveland, OH United States)
Townsend, Jacqueline A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Gaier, James R. (NASA Lewis Research Center Cleveland, OH United States)
Jalics, Alice I. (Cleveland State Univ. Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1998
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.15:208828
E-11439
NASA/TM-1998-208828
Funding Number(s)
PROJECT: RTOP 632-1A-1E
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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