ENHANCEMENT OF ATOMIC OXYGEN-INDUCED EROSION OF SPACECRAFT POLYMERIC MATERIALS BY SIMULTANEOUS ULTRAVIOLET EXPOSURE

2006 ◽  
pp. 141-152
Author(s):  
KUMIKO YOKOTA ◽  
NOBUO OHMAE ◽  
MASAHITO TAGAWA
Keyword(s):  
Atomic Oxygen ◽  
Polymeric Materials ◽  
Ultraviolet Exposure

Protection of Polymeric Materials from Atomic Oxygen

1999 ◽  
Vol 11 (1) ◽  
pp. 157-165 ◽  
Author(s):  
R C Tennyson
Keyword(s):  
Atomic Oxygen ◽  
Polymeric Materials

An integrating sphere-based ultraviolet exposure chamber design for the photodegradation of polymeric materials

1999 ◽  
Vol 63 (2) ◽  
pp. 297-304 ◽  
Author(s):  
Jonathan W Martin ◽  
Joannie W Chin ◽  
W.Eric Byrd ◽  
Edward Embree ◽  
Kevin M Kraft
Keyword(s):  
Polymeric Materials ◽  
Exposure Chamber ◽  
Integrating Sphere ◽  
Ultraviolet Exposure ◽  
Chamber Design

Unified model for low-Earth-orbital atomic-oxygen and atomic-oxygen/ultraviolet induced erosion of polymeric materials

2016 ◽  
Vol 53 ◽  
pp. 194-206 ◽  
Author(s):  
Laiwen Chen ◽  
Zongchen Li ◽  
Chun-Hian Lee ◽  
Wang Jiahong
Keyword(s):  
Atomic Oxygen ◽  
Polymeric Materials ◽  
Unified Model

scholarly journals Self-Healing Anti-Atomic-Oxygen Phosphorus-Containing Polyimide Film via Molecular Level Incorporation of Nanocage Trisilanolphenyl POSS: Preparation and Characterization

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1013 ◽  
Author(s):  
Bohan Wu ◽  
Yan Zhang ◽  
Dayong Yang ◽  
Yanbin Yang ◽  
Qiang Yu ◽  
...  
Keyword(s):  
Atomic Oxygen ◽  
Composite Films ◽  
Polymeric Materials ◽  
Polyimide Film ◽  
Low Earth Orbit ◽  
Nanocomposite Films ◽  
Self Healing ◽  
Passivation Layers ◽  
Pyromellitic Anhydride ◽  
Oligomeric Silsesquioxane

Protection of polymeric materials from the atomic oxygen erosion in low-earth orbit spacecrafts has become one of the most important research topics in aerospace science. In the current research, a series of novel organic/inorganic nanocomposite films with excellent atomic oxygen (AO) resistance are prepared from the phosphorous-containing polyimide (FPI) matrix and trisilanolphenyl polyhedral oligomeric silsesquioxane (TSP–POSS) additive. The PI matrix derived from 2,2’-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 2,5-bis[(4-amino- phenoxy)phenyl]diphenylphosphine oxide (BADPO) itself possesses the self-healing feature in AO environment. Incorporation of TSP–POSS further enhances the AO resistance of the FPI/TSP composite films via a Si–P synergic effect. Meanwhile, the thermal stability of the pristine film is maintained. The FPI-25 composite film with a 25 wt % loading of TSP–POSS in the FPI matrix exhibits an AO erosion yield of 3.1 × 10−26 cm3/atom after an AO attack of 4.0 × 1020 atoms/cm2, which is only 5.8% and 1.0% that of pristine FPI-0 film (6FDA-BADPO) and PI-ref (PMDA-ODA) film derived from 1,2,4,5-pyromellitic anhydride (PMDA) and 4,4’-oxydianline (ODA), respectively. Inert phosphorous and silicon-containing passivation layers are observed at the surface of films during AO exposure.

Degradation of polymeric materials for covering spacecraft solar arrays under exposure to atomic oxygen flows

2005 ◽  
Vol 11 (5-6) ◽  
pp. 78-86 ◽  
Author(s):  
V.A. Shuvalov ◽  
◽  
V.G. Tikhii ◽  
A.I. Priymak ◽  
I.A. Gusarova ◽  
...  
Keyword(s):  
Atomic Oxygen ◽  
Polymeric Materials ◽  
Solar Arrays

Monte Carlo Modeling of Atomic Oxygen Interaction with Protected Polymers for Projection of Materials Durability in Low Earth Orbit

1992 ◽  
Vol 278 ◽  
Author(s):  
Bruce A. Banks ◽  
Bruce M. Auer ◽  
Sharon K. Rutledge ◽  
Linda Gebauer ◽  
Edward A. Sechkar
Keyword(s):  
Monte Carlo ◽  
Atomic Oxygen ◽  
Protective Coatings ◽  
Polymeric Materials ◽  
Low Earth Orbit ◽  
Earth Orbit ◽  
Textured Surfaces ◽  
Photovoltaic Array ◽  
Defect Sites ◽  
Oxygen Interaction

AbstractAtomic oxygen in low Earth orbit (LEO) readily attacks and oxidizes exposed spacecraft polymeric materials such as polyimide Kapton photovoltaic array blankets. The application of thin film silicon dioxide protective coatings can greatly extend the useful life of such materials in LEO. A Monte Carlo computational model has been developed which simulates atomic oxygen interaction with polymeric and protective coating materials for both ground laboratory and in-space experiments, allowing the determination of the geometrical shape of atomic oxygen attack of protected polymeric materials at defect sites in protective coatings. Modeling of attack of unprotected carbon-carbon composite materials predicts textured surfaces suitable for high emittance radiators. Results for fiberglass composites indicate loss of the matrix polymer leading to friable fibers. The computational modeling to project in-space performance based on ground laboratory testing predicts mass loss per fluence in space to be approximately one third that observed in plasma ashers.

scholarly journals Property changes in materials due to atomic oxygen in the low Earth orbit

2021 ◽  
Author(s):  
Aki Goto ◽  
Kaori Umeda ◽  
Kazuki Yukumatsu ◽  
Yugo Kimoto
Keyword(s):  
Photoelectron Spectroscopy ◽  
Atomic Oxygen ◽  
Surface Reactions ◽  
Ccd Camera ◽  
Polymeric Materials ◽  
Thermal Control ◽  
Polyimide Film ◽  
Low Earth Orbit ◽  
Earth Orbit ◽  
Exposure Experiment

AbstractWe expect satellites at altitude below 300 km, very low Earth orbit (VLEO), making observations of the Earth at optical wavelength with increasingly higher resolution. The density of atomic oxygen (AO) at VLEO is significantly higher than that at LEO; severe degradation of spacecraft materials (polymers) due to the high-flux AO is a serious concern. To clarify VLEO environmental effects on spacecraft materials, we designed the Material Degradation Monitor (MDM) and MDM2 missions. The MDM is a material exposure experiment onboard the Super Low-Altitude Test Satellite (SLATS). It aims to understand reactions and degradation of polymeric materials depending on AO fluence in VLEO. In the MDM, samples of spacecraft material were exposed at altitude of 160–560 km; their degradation behaviors were observed optically by a CCD camera for 1.8 years. The MDM2 is a material exposure experiment onboard the International Space Station (ISS) and aims to correctly understand surface reactions and degradation of the same samples used in the MDM at a given AO fluence. In the MDM2, the samples were exposed at altitude of 400 km for 1 year and then returned to Earth for analysis. Based on the results from both missions, we will help in the molecular design of more-durable materials, and establish design standards for future VLEO satellites. This study aims to quantitatively understand the surface reactions and degradation of the 11 types of thermal control materials exposed on the ISS in the MDM2. Five types of multilayer insulation (MLI) films (three types of Si-containing AO protective materials (a silsesquioxane-(SQ-) containing coated polyimide film, two types of polysiloxane-block polyimide (BSF-30) films), an ITO-coated polyimide film, and a Beta Cloth), and flexible optical solar reflectors (flexible OSRs) were found to have a high durability against erosion by AO. This was determined by measuring their loss of mass and thermo-optical properties. The Ag/Inconel layer’s discoloration and peeling were observed for three types of FEP/Ag films as determined by the Ag layer’s oxidation by AO. Also, X-ray photoelectron spectroscopy (XPS) showed that reactions of the Si-containing materials, the SQ-coated polyimide film and the BSF-30 film, form a layer of silica that protects against AO. Even though the concentration of Si in the SQ-coating is the same or greater than in the BSF-30 film, the amount of the SQ-coating that reacted was larger than that of the BSF-30 film under the same AO fluence. Moreover, the effective ability of the UV-shielding coating, composed of ITO and CeO2 coated onto one of the BSF-30 films, was demonstrated by UV–Vis spectrometry. Its sufficient AO protection was confirmed by mass measurements, XPS analyses, and FE-SEM observations.

scholarly journals Analysis of atomic oxygen and ultraviolet exposure effects on cycloaliphatic epoxy resins reinforced with octa-functional POSS

2018 ◽  
Vol 142 ◽  
pp. 103-111 ◽  
Author(s):  
Agnieszka Suliga ◽  
Ewa M. Jakubczyk ◽  
Ian Hamerton ◽  
Andrew Viquerat
Keyword(s):  
Epoxy Resins ◽  
Atomic Oxygen ◽  
Ultraviolet Exposure ◽  
Cycloaliphatic Epoxy ◽  
Cycloaliphatic Epoxy Resins
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