ポリイミド系宇宙用熱制御材料の紫外線・放射線劣化の評価

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For the exploration mission of Mercury, long-term heat resistance is required in thermal control materials based on polyimide film. The polyimide film Kapton-H is the most available heat resistant polyimer in thermal control materials. In recent years, however, several kinds of polyimides have developed. In the polymide films, UPILEX-S(UBE), generated biphenyl tetracarboxylic acid dianhydride and p-phenylene diamine, is superior to long-term heat resistance. The purpose of this work is to evaluate of degradation properties for thermal control material based upon the UPILEX-S. In this paper, first, we describe the measurement result of important parameter, incident angle dependence of solar absorptance and temperature dependence of total hemispherical emittance, for thermal design of the satellite. Second, independent radiation tests for UV, electron, and proton are carried out on the assumption of space environment, and the experimental results are evaluated. Finally, the cause of degradation is deduced for polyimide films. From the experimental results of independent radiation tests for UV, electron, and proton, the degradation for the low-energy electron and the proton radiation are most significant, the increase of absorption coefficient is maxim at around 0.4μm wavelengthy. It was deduced that the degradation of the polyimide film is caused by radicals and that the recovery occurs by reactions of its radicals. Consequently, for the evaluation of degradation on thermal control material in space environment, it is necessary to study about radicals generated in a polyimide film from the optical standpoint. From the measurement results, it is obvious that the film is superior to irradiation and radiation resistance, and is extremely useful in thermal control materials.
東海大学の論文

ポリイミド系宇宙用熱制御材料の紫外線・放射線劣化の評価

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