This paper describes the vacuum ultraviolet (VUV) radiation durability screening testing of thin (12.7-25.4 micron) polyimide films proposed for use on the Next Generation Space Telescope (NGST) sunshield. Materials included in this screening test were Kapton E, Kapton HN, Upilex S, CP1, CP1 with vapour deposited aluminium (VDA) on its back surface, and CP2 with a VDA coating on its back surface. Samples were exposed to approximately 1000 equivalent sun hours (ESH) of VUV radiation and examined for changes in solar absorptance, thermal emittance, ultimate tensile strength, and elongation at failure. Changes in the solar absorptance were observed for some materials, and, additionally, significant changes in spectral reflectance were observed in the ultraviolet to visible wavelength region for all of the polyimide materials tested. Changes in the ultimate tensile strength and elongation at failure were within the experimental uncertainty for all samples. Longer exposures are needed to verify the observed trends and to develop performance predictions for these materials on the NGST sunshield.


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    Title :

    Effects of vacuum ultraviolet radiation on thin polyimide films


    Contributors:
    Dever, J.A. (author) / Messer, R. (author) / Powers, C. (author) / Townsend, J. (author) / Wooldridge, E. (author)


    Publication date :

    2001


    Size :

    9 Seiten, 7 Bilder, 9 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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