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Erosion Data from the MISSE 8 Polymers Experiment After 2 Years of Space Exposure on the International Space StationThe Polymers Experiment was exposed to the low Earth orbit (LEO) space environment for 2.14 and 2.0 years as part of the Materials International Space Station Experiment 8 (MISSE 8) and the Optical Reflector Materials Experiment-III (ORMatE-III), respectively. The experiment contained 42 samples, which were flown in either ram, wake, or zenith orientations. The primary objective was to determine the effect of solar exposure on the atomic oxygen erosion yield (Ey) of fluoropolymers. This paper provides an overview of the experiment with details on the polymers flown, the characterization techniques used, the atomic oxygen fluence for each exposure orientation, and the LEO Ey results. The Ey values for the fluoropolymers range from 1.45 x 10(exp -25) cm(exp 3)/atom for white Tedlar Registered Trademark (polyvinyl fluoride with white titanium dioxide pigment) flown in the ram orientation to 6.32 x 10(exp -24) cm(exp 3)/atom for aluminized-Teflon Registered Trademark fluorinated ethylene propylene (Al-FEP) flown in the zenith orientation. Erosion yield data for FEP flown in ram, wake and zenith orientations are compared, and the Ey was found to be highly dependent on orientation, hence environmental exposure. Teflon FEP had an order of magnitude higher Ey when flown in the zenith direction (6.32 x10(exp -24) cm(exp3)/atom) as compared to the ram direction (2.37 x 10(exp -25) cm(exp 3)/atom). The Ey of FEP was found to increase with a direct correlation to the solar exposure/AO fluence ratio showing the effect of solar radiation and/or heating due to solar exposure on FEP erosion. In addition, back-surface carbon painted FEP (C-FEP) flown in the zenith orientation had a significantly higher Ey than clear FEP or Al-FEP further indicating that heating has a significant impact on the erosion of FEP, particularly in the zenith orientation.
Document ID
20170003908
Document Type
Presentation
Authors
de Groh, Kim K. (NASA Glenn Research Center Cleveland, OH United States)
Banks, Bruce A. (Science Applications International Corp. Cleveland, OH, United States)
Asmar, Olivia C. (Hathaway Brown School Shaker Heights, OH, United States)
Yi, Grace T. (Hathaway Brown School Shaker Heights, OH, United States)
Mitchell, Gianna G. (Hathaway Brown School Shaker Heights, OH, United States)
Guo, Aobo (Hathaway Brown School Shaker Heights, OH, United States)
Sechkar, Edward A. (Zin Technologies, Inc. Cleveland, OH, United States)
Date Acquired
April 26, 2017
Publication Date
July 12, 2016
Subject Category
Inorganic, Organic and Physical Chemistry
Spacecraft Design, Testing and Performance
Space Sciences (General)
Report/Patent Number
GRC-E-DAA-TN33076
Meeting Information
2016 International Space Station (ISS) Research and Development (R&D) Conference(San Diego, CA)
Funding Number(s)
CONTRACT_GRANT: NNC12BA01B
WBS: WBS 769347.05.08.25.40.01.02
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Solar radiation
Oxygen atoms
Teflon
Earth Orbital Environments
Erosion

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