Atomic oxygen resistant coatings for low earth orbit space structures

1995 ◽  
Vol 30 (2) ◽  
pp. 308-320 ◽  
Author(s):  
S. Packirisamy ◽  
D. Schwam ◽  
M. H. Litt
Keyword(s):  
Atomic Oxygen ◽  
Orbit Space ◽  
Low Earth Orbit ◽  
Space Structures ◽  
Earth Orbit

Effects of Atomic Oxygen Irradiation on PDMS/POSS Hybrid Films in Low Earth Orbit Environment

2011 ◽  
Vol 239-242 ◽  
pp. 1368-1371 ◽  
Author(s):  
Mi Mi Song ◽  
Shu Wang Duo ◽  
Ting Zhi Liu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Atomic Oxygen ◽  
Orbit Space ◽  
Low Earth Orbit ◽  
Hybrid Coating ◽  
Space Environment ◽  
Earth Orbit ◽  
Chemical Compositions ◽  
Hybrid Films ◽  
Polyimide Films

In order to improve the atomic oxygen (AO) erosion resistance of polyimide films in low earth orbit space environment, a type PDMS/POSS hybrid coating on polyimide substrate was prepared based on a silanol terminated polydimethylsiloxane (PDMS-OH) and Octakis(trimethylsiloxy)octaprismosilsesquioxane (Q8[Si(CH3)3]8) by copolymerizing process in DMAc solution. The atomic oxygen exposure tests were carried out using a ground-based atomic oxygen simulation facility. The mass loss, surface morphology and surface chemical compositions of PDMS/POSS hybrid films before and after exposure to incremental AO flux were investigated by using microbalance and field emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS), respectively. The data indicated that a silica-rich layer was formed on the surface of the hybrid coating when the coating is exposed to AO flux, which could provide a protective barrier on the surface preventing further degradation of the polymer during extended exposure to AO and obviously improved the AO resistance of polyimide films.

POSS enhanced 3D graphene - Polyimide film for atomic oxygen endurance in Low Earth Orbit space environment

Polymer ◽  
2020 ◽  
Vol 191 ◽  
pp. 122270 ◽  
Author(s):  
Ranjana Shivakumar ◽  
Asaf Bolker ◽  
Siu Hon Tsang ◽  
Nurit Atar ◽  
Ronen Verker ◽  
...  
Keyword(s):  
Atomic Oxygen ◽  
Orbit Space ◽  
Polyimide Film ◽  
Low Earth Orbit ◽  
Space Environment ◽  
Earth Orbit ◽  
3D Graphene

Mechanically Robust Atomic Oxygen-Resistant Coatings Capable of Autonomously Healing Damage in Low Earth Orbit Space Environment

2018 ◽  
Vol 30 (36) ◽  
pp. 1803854 ◽  
Author(s):  
Xiaohan Wang ◽  
Yixuan Li ◽  
Yuhai Qian ◽  
Hong Qi ◽  
Jian Li ◽  
...  
Keyword(s):  
Atomic Oxygen ◽  
Orbit Space ◽  
Low Earth Orbit ◽  
Space Environment ◽  
Earth Orbit

scholarly journals The Effect of Low Earth Orbit Atomic Oxygen Exposure on Phenylphosphine Oxide-Containing Polymers

2000 ◽  
Vol 12 (1) ◽  
pp. 43-52 ◽  
Author(s):  
John W Connell
Keyword(s):  
Thin Film ◽  
Atomic Oxygen ◽  
Low Earth Orbit ◽  
Space Environment ◽  
Earth Orbit ◽  
Cooperative Effort ◽  
Flight Experiment ◽  
Oxygen Exposure ◽  
Atomic Oxygen Exposure ◽  
Phenylphosphine Oxide

Thin films of phenylphosphine oxide-containing polymers were exposed to low Earth orbit aboard a space shuttle flight (STS-85) as part of flight experiment designated Evaluation of Space Environment and Effects on Materials (ESEM). This flight experiment was a cooperative effort between the NASA Langley Research Center (LaRC) and the National Space Development Agency of Japan (NASDA). The thin-film samples described herein were part of an atomic oxygen exposure (AOE) experiment and were exposed to primarily atomic oxygen (∼1×1019 atoms cm−2). The thin-film samples consisted of three phosphine oxide-containing polymers (arylene ether, benzimidazole and imide). Based on post-flight analyses using atomic force microscopy, x-ray photo-electron spectroscopy and weight loss data, it was found that the exposure of these materials to atomic oxygen (AO) produces a phosphorus oxide layer on the surface of the samples. Earlier work has shown that this layer provides a barrier towards further attack by AO. Consequently, these materials do not exhibit linear erosion rates which is in contrast with most organic polymers. Qualitatively, the results obtained from these analyses compare favourably with those obtained from samples exposed to AO and/or an oxygen plasma in ground-based exposure experiments. The results of the low Earth orbit AO exposure on these materials will be compared with those of ground-based exposure to AO.

Atomic Oxygen Resistant Polysiloxane Coatings for Low Earth Orbit Space Structures

2015 ◽  
Vol 830-831 ◽  
pp. 699-702 ◽  
Author(s):  
G.N. Arjun ◽  
T.L. Lincy ◽  
T.S. Sajitha ◽  
S. Bhuvaneshwari ◽  
Thomas Deepthi ◽  
...  
Keyword(s):  
Reaction Time ◽  
Surface Morphology ◽  
Mass Loss ◽  
Atomic Oxygen ◽  
Thermo Gravimetric Analysis ◽  
Orbit Space ◽  
Solid Content ◽  
Low Earth Orbit ◽  
Gravimetric Analysis ◽  
Coating Materials

Polysiloxane resin copolymer was synthesized through acid catalyzed hydrolysis of methyl triethoxysilane (MTEOS) and diethoxytetramethyldisiloxane (DEOTMDS). The effect of reaction time on the properties of the polymer was studied and this copolymer was characterized by GPC, 29Si NMR, IR, TGA, viscosity, refractive index, specific gravity and solid content. 29Si NMR and IR showed characteristic signals of Si-O-Si linkage which confirmed the formation of the polymer. GPC and solid content analysis showed an increasing trend in molecular weight with reaction time. Thermo gravimetric analysis showed that the polymer was thermally stable upto ≈ 260°C and all the polymers gave a ceramic residue in the range of 77-80% at 900°C. Siloxane prepared inhouse and methyl phenyl silsequioxane (control) were used as coating materials and atomic oxygen (AO) resistance was evaluated on Al-Kapton, carbon polyimide composite and glass polyimide composite. The mass loss and surface morphology of the coated samples were measured at different time intervals. It is observed that mass loss of polysiloxane coated samples was very less, compared to coated control samples. The morphology of all the samples were studied using FESEM. Erosion kinetics and surface morphology investigation indicate that the polysiloxane coating possesses excellent AO resistance, and displays better cracking resistance on AO exposure.

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