Vacuum and ultraviolet-radiation effects on binders and pigments for spacecraft thermal-control coatings
Donald J. Progar, William R. Wade, United States. National Aeronautics and Space Administration, Langley Research Center
National Aeronautics and Space Administration, 1971 - Technology & Engineering - 42 pages
This paper presents an evaluation of several silicone resin binders and powdered inorganic pigments for potential use in spacecraft thermal-control paint formulations. The pigments were selected on the basis of a hypothesis relating the heat of formation of a compound to the compound's resistance to ultraviolet-radiation-induced degradation. Reflectance measurements were made in situ to determine degradatiorna tes due to ultraviolet radiation. The tested polydimethylsiloxane resins were not significantly affected by long exposures to ultraviolet radiation. All the pigments, which were dispersed in a polydimethylsiloxane resin, were degraded by ultraviolet radiation as determined by an increase of solar absorptance. For the materials evaluated in this study, no evidence was found to indicate that pigments with high heats of formation were resistant to ultraviolet degradation.
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100-percent reference acquisition and reduction AERONAUTICS AND SPACE Avogadro constant binder materials critical wavelength Cure schedule data acquisition data readout discrete photon emery paper energy ESH of simulated Hafnium heat of formation high vacuum inconel index of refraction inorganic pigments integrating sphere kJ/mole Langley Research Center lower molecular weight measured spectral reflectance n-butanol NASA NATIONAL AERONAUTICS O-I Type Oxides particle Pigment compound pigment-binder ratio Planck constant polydimethylsiloxane resins Polymethylphenylsiloxane quartz tube radiation-induced degradation reduced pressure reflectance of sample reflectometer resistance to ultraviolet retransmitting slidewire sample corrected severely degraded shown in figure shown in table silicone resin binders simulated solar ultraviolet simulated space environment solar absorptance obtained solar ultraviolet radiation solvents SPACECRAFT THERMAL-CONTROL standard heat temperature test sample thermal THERMAL-CONTROL COATINGS thermal-control paint thermocouple detector total normal emittance Type 650 resin ultraviolet degradation ultraviolet exposure ultraviolet irradiation vacuum and ultraviolet value of spectral values of solar Xylol zinc sulfide