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2006 Fiscal Year Final Research Report Summary

Development of quantitative ground-based simulation technology on PEP-MLI degradation under the complex space environment

Research Project

Project/Area Number 17560698
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Aerospace engineering
Research InstitutionKobe University

Principal Investigator

YOKOTA Kumiko  Kobe Univ., Faculty of Eng., Research staff, 工学部, 教務職員(教育職) (20252794)

Co-Investigator(Kenkyū-buntansha) TAGAWA Masahito  Kobe Univ., Faculty of Eng, Associate Professor, 工学部, 助教授 (10216806)
OKAMOTO Akio  Technology Research Institute of Osaka Prefecture, System Technology Dept., Chief Researcher, 情報電子部, 主任研究員 (20359376)
Project Period (FY) 2005 – 2006
KeywordsSpace Environment / Low Earth Orbit / Atomic Oxygen / Ultraviolet / EUV / FEP / Synergistic Environment / Erosion
Research Abstract

Fluorinated ethylene propylene (FEP) and polyimide are one of the widely used polymers as spacecraft thermal control materials. It is known that these spacecraft materials are eroded by atomic oxygen (AO) in low Earth orbit (LEO). FEP has higher atomic oxygen resistance than polyimide, which is a reference material to measure the AO fluence in LEO. However FEP is sensitive to ultraviolet (UV). Erosion properties of FEP by hyperthermal impact of AO need to be clarified under simultaneous UV radiation exposure conditions.
The experimental results obtained are listed below.
(1) AO-induced FEP and polyimide erosions follow cosine function regarding the incident angle of AO. This experimental result suggests that the reaction efficiency of AO is independent of the incident angle.
(2) UV exposure does not affect mass loss on polyimide without AO exposure; however, the erosion rate of FEP linearly decreases with increasing incident angle of UV.
(3) No synergistic effect of AO and UV was observed on FEP erosion. In the case of FEP, the adsorption of O-atom does not occur by AO exposure and the gasification reaction by AO and that by UV are independent reaction pathways.
(4) EUV from N_2 beam, which can eliminate the effect of AO reaction, hardly influence the mass loss of FEP.
These results of this study can be used to establish the database of spacecraft polymeric materials.

  • Research Products

    (14 results)

All 2007 2006

All Journal Article (14 results)

  • [Journal Article] Comparison of polyethylene and polyimide as a fluence monitor of atomic oxygen2007

    • Author(s)
      Yokota K.
    • Journal Title

      Journal Spacecraft and Rockets 44

      Pages: 434-438

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Potential hazards on the oxidation reaction of satellite materials in the extreme environments in space2007

    • Author(s)
      Tagawa M
    • Journal Title

      3^<rd> International Workshop on Oxidation Reactions (in press)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Yokota, Comparison of polyethylene and polyimide as a fluence monitor of atomic oxygen2007

    • Author(s)
      Kumiko
    • Journal Title

      Journal Spacecraft and Rockets Vol.44, No.2

      Pages: 434-438

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Potential hazards on the oxidation reaction of satellite materials in the extreme environments in space2007

    • Author(s)
      Masahito, Tagawa
    • Journal Title

      3^<rd> International Workshop on Oxidation Reactions

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Enhancement of atomic oxygen-induced erosion of spacecraft polymeric materials by simultaneous ultraviolet exposure2006

    • Author(s)
      Yokota K.
    • Journal Title

      Protection of Materials and Structures from the Space Environment

      Pages: 141-152

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Synergistic effects of vacuum ultraviolet on the atomic oxygen-induced erosion of fluorinated polymer2006

    • Author(s)
      Yokota K.
    • Journal Title

      Proceedings of 10th International Symposium on Materials in Space Environment, 8th International Space Conference, Protection of Materials and Structures from the LEO Space Environment ESA-SP616(CD-ROM)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Atomic oxygen-induced polymer degradation phenomena in simulated LEO space environments : How do polymers react in a complicated space environment?2006

    • Author(s)
      Tagawa M.
    • Journal Title

      Acta Astronautica (in press)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Comparative study of polyimide and FEP on the simultaneous exposure effects on atomic oxygen and ultraviolet2006

    • Author(s)
      Yokota K.
    • Journal Title

      The 25^<th> International Symposium on Space Technology and Science, Kanazawa (CD-ROM)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Enhancement of atomic oxygen-induced erosion of spacecraft polymeric materials by simultaneous ultraviolet exposure2006

    • Author(s)
      Kumiko, Yokota
    • Journal Title

      Protection of Materials and Structures from the Space Environment (Ed. J. I. Kleiman) (Springer, Dordrecht)

      Pages: 141-152

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Synergistic effects of vacuum ultraviolet on the atomic oxygen-induced erosion of fluorinated polymer2006

    • Author(s)
      Kumiko, Yokota
    • Journal Title

      Proceedings of 10th International Symposium on Materials in Space Environment, 8th International Space Conference, Protection of Materials and Structures from the LEO Space Environment (Collioure, France) ESA-SP616(in CD-ROM)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Atomic oxygen-induced polymer degradation phenomena in simulated LEO space environments : How do polymers react in a complicated space environment?2006

    • Author(s)
      Masahito, Tagawa
    • Journal Title

      Acta Astronautica

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Comparative study of polyimide and FEP on the simultaneous exposure effects on atomic oxygen and ultraviolet2006

    • Author(s)
      Kumiko, Yokota
    • Journal Title

      The 25^<th> International Symposium on Space Technology and Science, Kanazawa (in CD-ROM)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] A novel room temperature oxidation technique using hyperthermal broad atomic/molecular beams2006

    • Author(s)
      Masahito, Tagawa
    • Journal Title

      2^<nd> International Symposium on Oxidation Reaction, Osaka

      Pages: 7-25

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Polyimide erosion in low earth orbit space environment2006

    • Author(s)
      Masahito, Tagawa
    • Journal Title

      Journal of Adhesion Science and Technology, Polyimides and Other High Temperature Polymers : Synthesis, Characterization and Applications (Mittal K. L. Ed) (VSP, Utrecht) Vol.3

      Pages: 553570

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2008-05-27  

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