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Ground-Laboratory to In-Space Atomic Oxygen Correlation for the Polymer Erosion and Contamination Experiment (PEACE) PolymersThe Materials International Space Station Experiment 2 (MISSE 2) Polymer Erosion and Contamination Experiment (PEACE) polymers were exposed to the environment of low Earth orbit (LEO) for 3.95 years from 2001 to 2005. There were 41 different PEACE polymers, which were flown on the exterior of the International Space Station (ISS) in order to determine their atomic oxygen erosion yields. In LEO, atomic oxygen is an environmental durability threat, particularly for long duration mission exposures. Although spaceflight experiments, such as the MISSE 2 PEACE experiment, are ideal for determining LEO environmental durability of spacecraft materials, ground-laboratory testing is often relied upon for durability evaluation and prediction. Unfortunately, significant differences exist between LEO atomic oxygen exposure and atomic oxygen exposure in ground-laboratory facilities. These differences include variations in species, energies, thermal exposures and radiation exposures, all of which may result in different reactions and erosion rates. In an effort to improve the accuracy of ground-based durability testing, ground-laboratory to in-space atomic oxygen correlation experiments have been conducted. In these tests, the atomic oxygen erosion yields of the PEACE polymers were determined relative to Kapton H using a radio-frequency (RF) plasma asher (operated on air). The asher erosion yields were compared to the MISSE 2 PEACE erosion yields to determine the correlation between erosion rates in the two environments. This paper provides a summary of the MISSE 2 PEACE experiment; it reviews the specific polymers tested as well as the techniques used to determine erosion yield in the asher, and it provides a correlation between the space and ground laboratory erosion yield values. Using the PEACE polymers asher to in-space erosion yield ratios will allow more accurate in-space materials performance predictions to be made based on plasma asher durability evaluation.
Document ID
20110006367
Document Type
Technical Memorandum (TM)
Authors
Stambler, Arielle H. (Hathaway Brown School Shaker Heights, OH, United States)
Inoshita, Karen E. (Hathaway Brown School Shaker Heights, OH, United States)
Roberts, Lily M. (Hathaway Brown School Shaker Heights, OH, United States)
Barbagallo, Claire E. (Hathaway Brown School Shaker Heights, OH, United States)
deGroh, Kim K. (NASA Glenn Research Center Cleveland, OH, United States)
Banks, Bruce A. (Alphaport, Inc. Cleveland, OH, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2011
Subject Category
Spacecraft Design, Testing and Performance
Report/Patent Number
E-17482
NASA/TM-2011-216904
Meeting Information
9th International Conference on Protection of Materials and Structures from Space Environment (ICPMSE-9)(Toronto)
Distribution Limits
Public
Copyright
Public Use Permitted.

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