Polymers and other oxidizable materials on the exterior of spacecraft in the low Earth orbit (LEO) space environment can be eroded due to reaction with atomic oxygen (AO). Therefore, in order to design durable spacecraft it is important to know the LEO AO erosion yield (E(sub y), volume loss per incident oxygen atom) of materials susceptible to AO reaction. Two spaceflight experiments, the Polymers Experiment and the Zenith Polymers Experiment, were developed to determine the AO E(sub y) of various polymers flown in ram, wake or zenith orientations in LEO. These experiments were flown as part of the Materials International Space Station Experiment 7 (MISSE 7) mission for 1.5 years on the exterior of the International Space Station (ISS). The experiments included Kapton H(TradeMark) witness samples for AO fluence determination in ram and zenith orientations. The Polymers Experiment also included samples to determine whether AO erosion of high and low ash containing polymers is dependent on fluence. This paper provides an overview of the MISSE 7 mission, a description of the flight experiments with details on the polymers flown, the characterization techniques used, the AO fluence for each exposure orientation, and the LEO E(sub y) results. The E(sub y) values ranged from 7.99x10(exp -28)cu cm/atom for TiO2/Al2O3 coated Teflon(TradeMark) fluorinated ethylene propylene (FEP) flown in the ram orientation to 1.22x10(exp -23cu cm/atom for polyvinyl alcohol (PVOH) flown in the zenith orientation. The E(sub y) of similar samples flown in different orientations has been compared to help determine solar exposure and associated heating effects on AO erosion. The E(sub y) data from these ISS spaceflight experiments provides valuable information for LEO spacecraft design purposes.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Erosion Results of the MISSE 7 Polymers Experiment and Zenith Polymers Experiment After 1.5 Years of Space Exposure


    Beteiligte:
    De Groh, Kim K. (Autor:in) / Banks, Bruce A. (Autor:in) / Yi, Grace T. (Autor:in) / Haloua, Athena (Autor:in) / Imka, Emily C. (Autor:in) / Mitchell, Gianna G. (Autor:in) / Asmar, Olivia C. (Autor:in) / Leneghan, Halle A. (Autor:in) / Sechkar, Edward A. (Autor:in)

    Erscheinungsdatum :

    01.12.2016


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch





    Overview of the MISSE 7 Polymers and Zenith Polymers Experiments after 1.5 Years of Space Exposure

    Yi, G.T. / de Groh, K.K. / Banks, B.A. et al. | British Library Conference Proceedings | 2013


    MISSE PEACE Polymers: An International Space Station Environmental Exposure Experiment

    K. K. deGroh / B. A. Banks / A. M. Hammerstrom et al. | NTIS | 2001


    MISSE PEACE Polymers - An International Space Station environmental exposure experiment

    Kaminski, Carolyn / Marx, Laura / Wright, Douglas et al. | AIAA | 2001


    MISSE 6 Stressed Polymers Experiment Atomic Oxygen Erosion Data

    de Groh, K.K. / Banks, B.A. / Mitchell, G.G. et al. | British Library Conference Proceedings | 2013