Evaluation of Protective Silicone/Siloxane Coatings in Simulated Low-Earth-Orbit Environment

Dworak, David P.; Banks, Bruce A.; Karniotis, Christina A.; Soucek, Mark D.

doi:10.2514/1.15787

Cited by 28 publications

(25 citation statements)

References 17 publications

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“…Thermal gravimetric analysis was performed to observe the thermal stability of the ceramer coating compared to DC 93-500. 33 Irreversible changes to the crosslinked structure of silicone polymers unavoidably occur at high temperatures due to chain scission or oxidative crosslinking. 10 In an inert atmosphere, depolymerization occurs with the loss of volatile products-mostly low-molecular weight cyclic oligomers-but is often catalyzed by traces of acids, bases, water, or residual catalysts used in the polymer's original production.…”

Section: Sol-gel Hybrid Coatingsmentioning

confidence: 99%

A new class of silicone resins for coatings

2007

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A new class of silicone has been developed for coatings or as coating additives. Cycloaliphatic silane monomers were prepared and reacted into more easily handled cyclic oligomers. These cyclic oligomers were ring-opened into siloxane polymers. The polymers were functionalized with a variety of groups, including: amino, glycidyl epoxide, cyclohexene epoxide, acrylic, and alkoxysilane. The cycloaliphatic silicones have been designed for a number of different curing conditions: (1) ambient temperature-cure (amino and glycidyl epoxide), (2) cationic ultraviolet (UV)-cure (cyclohexene epoxide), (3) radical UV-cure (acrylic), and (4) moisture-cure (alkoxysilane). The end usages thus far have been focused on silicone coatings; however, usage as coating additives will be a focus for future research. The cycloaliphatic silicone has been UV-cured with mixed sol-gel precursors for usage as aerospace coatings. The cycloaliphatic silicones have also been ambient temperature-cured for release coatings, and have application as anti-fouling coatings. The inherent low surface energy makes the cycloaliphatic silicones prime candidates for surface tension additives.

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Section: Sol-gel Hybrid Coatingsmentioning

confidence: 99%

A new class of silicone resins for coatings

2007

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“…이러한 이유로 우주환경에 대한 저항성을 자체 적으로 가지고 있는 고분자 재료를 만들기 위한 연구들이 다방면으로 수행 되고 있다 [11,12]. NASA에서는 최근 연구 개발 로드맵을 통하여 이와 같은 복합재료 청사진을 제시 하고 있다 [13].…”

Section: 서 론unclassified

Characteristics of Silane Treated Graphene Filled Nanocomposites Exposed to Low Earth Orbit Space Environment

Noh¹,

Jin²,

Kim³

2015

Composites Research

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This study investigates the property of graphene filled polymer nanocomposites in LEO(Low Earth orbit) environment conditions. In order to improve compatibility with polymer matrices and resistance of carbon material against AO(Atomic oxygen) attack, silanization of graphene oxide with organosilane was carried out. The corresponding moieties were characterized through X-ray photoelectron spectroscopy (XPS). Graphene oxide filled nanocomposites were prepared using solution based processing methods. The sets of specimen series were tested in an accelerated LEO simulated space environment facility. Graphene oxide and silane treated graphene oxide reinforced nanocomposites were compared with neat epoxy. The comparison revealed that the silane treated graphene filled polymer composite shows inherent resistance against atomic oxygen attack while the lack of silane treatment resulted in a reduction in performance.

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“…In contrast, the AO erosion yields of organic coatings are one or two orders of magnitude higher than that of inorganic coatings. 8 In recent years, polymer nanocomposites have attracted a great deal of research attention because they may exhibit substantially improved physical and mechanical properties. Polymer based nanocomposite are a novel class of materials that are reinforced by one or more types of fillers of which at least one dimension of the dispersed particles in the polymer matrix is in the nanometer range.…”

Section: Introductionmentioning

confidence: 99%

Erosion Effects of Atomic Oxygen on Polyhedral Oligomeric Silsesquioxane-Polyimide Hybrid Films in Low Earth Orbit Space Environment

Duo

Mimi²,

Liu³

et al. 2013

j. nanosci. nanotech.

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A novel polyimide (PI) hybrid nanocomposite containing polyhedral oligomeric silsesquioxane (POSS) had been prepared by copolymerization of trisilanolphenyl-POSS, 4,4'-oxydianiline (ODA), and pyromellitic dianhydride (PMDA). The AO resistance of these PI/POSS hybrid films was tested in the ground-based AO simulation facility. Exposed and unexposed surfaces were characterized by SEM and X-ray photoelectron spectroscopy. SEM images showed that the surface of the 20 wt% PI/POSS became much less rough than that of the pristine polyimide. Mass measurements of the samples showed that the erosion yield of the PI/POSS (20 wt.%) hybrid film was 1.2 x 10(-25) cm3/atom, and reduced to 4% of the polyimide film. The XPS data indicated that the carbon content of the near-surface region was decreased from 60.1 to 13.2 at% after AO exposure. The oxygen and silicon concentrations in the near-surface region increased to 1.96 after AO exposure. The nanometer-sized structure of POSS, with its large surface area, had led AO-irradiated samples to form a SiO2 passivation layer, which protected the underlying polymer from further AO attack. The incorporation of POSS into the polyimide could dramatically improve the AO resistance of polyimide films in low earth orbit environment.

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Evaluation of Protective Silicone/Siloxane Coatings in Simulated Low-Earth-Orbit Environment

Cited by 28 publications

References 17 publications

A new class of silicone resins for coatings

A new class of silicone resins for coatings

Characteristics of Silane Treated Graphene Filled Nanocomposites Exposed to Low Earth Orbit Space Environment

Erosion Effects of Atomic Oxygen on Polyhedral Oligomeric Silsesquioxane-Polyimide Hybrid Films in Low Earth Orbit Space Environment

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