Use of hyperbranched polyethoxysiloxane to improve the resistance of thermoplastic polyimide coatings to atomic oxygen environment

Vernigorov, K. B.; Alent’ev, A. Yu.; Meshkov, I. B.; Muzafarov, А. М.; Воронина, Е. Н.; Novikov, L. S.; Chernik, V. N.

doi:10.1134/s2075113312020177

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…The close values of the modulus of elasticity of both surfaces of the PI/POSS nanocomposite film show the uniformity of the mechanical properties of the entire nanocomposite due to the high uniformity of the distribution of the filler throughout the sample volume. According to the literature data, the size of individual POSS particles is 20 nm, but when they are introduced into a polymer matrix in the traditional way, they coagulate, which prevents a uniform distribution over the whole volume of the composite [45]. In this case, the size of the aggregates increases with an increase in the concentration of POSS in the PI.…”

Section: Changes In Mechanical Properties After Exposure To Aomentioning

confidence: 99%

Synthesis of PI/POSS nanocomposite films based on track nuclear membranes and assessment of their resistance to oxygen plasma flow

Черкашина

Павленко

Носков

et al. 2021

Polymer

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This work presents, for the first time, data on the possibility of synthesizing polyimide nanocomposite films based on track nuclear membranes and organosiloxane (polyhedral oligomeric silsesquioxanes) POSS structures. The synthesis of the nanocomposite films was carried out by filling the tracks of a polyimide membrane with POSS structures under hydrothermal conditions in a high-pressure reactor. The surface and mechanical characteristics of the developed nanocomposite films were studied, and the results of their resistance to the flow of oxygen plasma are presented. It was found that the introduction of POSS structures significantly increased the resistance of polyimide to the flow of oxygen plasma. The PI/POSS composite exhibited an insignificant change in weight, the weight loss reached 0.92 ± 0.05 mg/cm 2 in 24 h after the start of the experiment, which is almost two orders of magnitude lower than that of the polyimide film.

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Section: Changes In Mechanical Properties After Exposure To Aomentioning

confidence: 99%

Synthesis of PI/POSS nanocomposite films based on track nuclear membranes and assessment of their resistance to oxygen plasma flow

Черкашина

Павленко

Носков

et al. 2021

Polymer

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“…The siloxane coating prepared by the plasma polymerization deposition technique has good uniformity on a large scale, which can be applied on the surface of a complex shape. Due to the compact structure, it is difficult for atomic oxygen to pass through the siloxane coating and erode the substrate materials, resulting in the longer service lifetime [31,32].…”

Section: Introductionmentioning

confidence: 99%

Effect of Coating Thickness on the Atomic Oxygen Resistance of Siloxane Coatings Synthesized by Plasma Polymerization Deposition Technique

et al. 2023

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Atomic oxygen in the low Earth orbit (LEO) environment is highly oxidizing. Due to the high flight speed of spacecraft, the relative kinetic energy of high-flux atomic oxygen bombarding the spacecraft surface can reach up to about 5 eV. Therefore, atomic oxygen is one of the most dangerous space environment factors in LEO, which seriously affects the safe operation and service life of spacecraft in orbit. In order to meet the requirements for the high reliability and long lifetime of spacecraft, effective protection measures must be taken on their sensitive surfaces. Siloxane is a coating with an organic–inorganic hybrid structure. Compared with SiO2 and other inorganic atomic oxygen protective coatings, it has better flexibility and is better at anti-atomic oxygen performance. In this paper, the plasma polymerization deposition technique was used to prepare large-area siloxane coatings on different substrates with different thicknesses for improving atomic oxygen resistance by optimizing the process parameters. The thickness of the coating was measured by different methods, and the results showed that the thickness distribution was consistent. By observing the surface morphology of the coating, it was uniform and compact without obvious defects, so the uniformity of large-area coating was also ideal. The adhesion and heat/humidity resistance of siloxane coatings were examined by pull-off testing and damp-heat testing, respectively. The results showed that the siloxane coatings with a thickness of about 400 nm exhibited better physical properties. At the same time, the ground simulation testing of atomic oxygen confirmed that siloxane coatings with a thickness of 418 nm presented the best performance of atomic oxygen resistance. The atomic oxygen erosion yield of siloxane coatings with a thickness of 418 nm was as low as 5.39 × 10−27 cm3/atoms, which was three orders of magnitude lower than that of the uncoated Kapton substrate and presented a good anti-atomic oxygen performance. Meanwhile, it has also successfully passed the damp-heat test. The coating thickness is only several hundred nanometers and does not increase the weight of the spacecraft, which makes it a relatively ideal LEO atomic oxygen protection material. Furthermore, a possible mechanism was proposed to explicate the physicochemical process of atomic oxygen attacking the coating materials.

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“…One of the innovative approaches to the preparation of elastomer compositions involves the creation of so-called "molecular composites". [23][24][25][26][27][28][29][30][31][32][33][34] Composites of this type have a number of advantages compared to the traditional composite materials owing to the specifics of the preparation of such systems, namely mixing a polymer matrix and a nanoscale molecular filler. The possibility of modifying the chemical structure of fillers along with their dimensions and concentration makes it possible to vary the characteristics of the composites in a controlled manner.…”

Section: Introductionmentioning

confidence: 99%

Studies on the effect of polyhedral carboranes on the physicochemical properties of polycarboranosiloxanes

et al. 2023

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Use of hyperbranched polyethoxysiloxane to improve the resistance of thermoplastic polyimide coatings to atomic oxygen environment

Cited by 9 publications

References 5 publications

Synthesis of PI/POSS nanocomposite films based on track nuclear membranes and assessment of their resistance to oxygen plasma flow

Synthesis of PI/POSS nanocomposite films based on track nuclear membranes and assessment of their resistance to oxygen plasma flow

Effect of Coating Thickness on the Atomic Oxygen Resistance of Siloxane Coatings Synthesized by Plasma Polymerization Deposition Technique

Studies on the effect of polyhedral carboranes on the physicochemical properties of polycarboranosiloxanes

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