14 September 2010 Ultra Low Outgassing silicone performance in a simulated space ionizing radiation environment
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Abstract
The improvement of silicone-based materials used in space and aerospace environments has garnered much attention for several decades. Most recently, an Ultra Low Outgassing™ silicone incorporating innovative reinforcing and functional fillers has shown that silicone elastomers with unique and specific properties can be developed to meet applications requiring stringent outgassing requirements. This paper will report on the next crucial step in qualifying these materials for spacecraft applications requiring chemical and physical stability in the presence of ionizing radiation. As a first step in this process, selected materials were irradiated with Co-60 gamma-rays to simulate the total dose received in near- Earth orbits. The paper will present pre-and post-irradiation response data of Ultra Low Outgassing silicone samples exposed under ambient air environment coupled with measurements of collected volatile condensable material (CVCM) and total mass loss (TML) per the standard conditions in ASTM E 595. The data will show an insignificant effect on the CVCMs and TMLs after exposure to various dosages of gamma radiation. This data may favorably impact new applications for these silicone materials for use as an improved sealant for space solar cell systems, space structures, satellite systems and aerospace systems.
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M. Velderrain, V. Malave, E. W. Taylor, "Ultra Low Outgassing silicone performance in a simulated space ionizing radiation environment", Proc. SPIE 7817, Nanophotonics and Macrophotonics for Space Environments IV, 781707 (14 September 2010); doi: 10.1117/12.861749; https://doi.org/10.1117/12.861749
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