Janus polyimide films with outstanding AO resistance, good optical transparency and high mechanical strength

Lian, Ruhe; Lei, Xingfeng; Xue, Shuyu; Chen, Yanhui; Zhang, Qiuyu

doi:10.1016/j.apsusc.2020.147654

Cited by 26 publications

(18 citation statements)

References 40 publications

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“…As labeled in Figure d, the C 1s XPS spectrum of CNT NFs shows a subpeak at 284.6 eV, assigning to the C–C or C–H bonds. The other subpeaks locating at 286.2 and 288.4 eV, respectively, ascribe to C–O and CO, in accordance with the O 1s subpeaks (Figure e), respectively, centering at 531.6 eV (CO) and 533.1 eV (C–O–C or C–OH). , Moreover, the C–Si–O 3 subpeak is clearly indicated in the Si 2p spectrum (Figure f), demonstrating that the functional groups (e.g., −OH and −COOH) on the surface of the CNTs are successfully condensed with siloxy groups from KH-560. , These results are in good agreement with the above FT-IR analysis.…”

Section: Resultssupporting

confidence: 68%

Mechanically Strong, Thermally Stable Gas Barrier Polyimide Membranes Derived from Carbon Nanotube-Based Nanofluids

Xiao

Lei

Xue

et al. 2021

ACS Appl. Mater. Interfaces

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Gas barrier membranes with impressive moisture permeability are highly demanded in air or nature gas dehumidification. We report a novel approach using polyetheramine oligomers covalently grafted on the carbon nanotubes (CNTs) to engineer liquid-like CNT nanofluids (CNT NFs), which are incorporated into a polyimide matrix to enhance the gas barrier and moisture permeation properties. Benefiting from the featured liquid-like characteristic of CNT NFs, a strong interfacial compatibility between CNTs and the polyimide matrix is achieved, and thus, the resulting membranes exhibit high heat resistance and desirable mechanical strength as well as remarkable fracture toughness, beneficially to withstanding creep, impact, and stress fatigue in separation applications. Positron annihilation lifetime spectroscopy measurements indicate a significant decrease in fractional free volume within the resulting membranes, leading to greatly enhanced gas barrier properties while almost showing full retention of moisture permeability compared to that of the pristine membrane. For membranes with 10 wt % CNT NFs, the gas transmission rates, respectively, decrease 99.9% for CH 4 , 94.4% for CO 2 , 99.2% for N 2 , and 97.9% for O 2 compared with that of the pristine membrane. Most importantly, with the increasing amount of CNT NFs, the hybrid membranes demonstrate a simultaneous increase of barrier performance and permselectivity for H 2 O/CH 4 , H 2 O/N 2 , H 2 O/CO 2 , and H 2 O/O 2 . All these results make these membranes potential candidates for high-pressure natural gas or hyperthermal air dehydration.

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Section: Resultssupporting

confidence: 68%

Mechanically Strong, Thermally Stable Gas Barrier Polyimide Membranes Derived from Carbon Nanotube-Based Nanofluids

Xiao

Lei

Xue

et al. 2021

ACS Appl. Mater. Interfaces

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“…After being coated with PHPS, the mass loss of Kapton significantly decreased from 6.5 mg cm −2 to 0.062 mg cm −2 with a total AO exposure fluence of 1.5 × 10 21 atoms cm −2 (Figure 5). The erosion yield of the PHPS coating was determined to be 5.13 × 10 −26 cm 3 atom −1 according to Equation (1), which was about two orders of magnitude less than that of pristine Kapton. According to the AO fluence on the serious erosion direction of the Hubble Space Telescope (HST) operated in LEO (about 1.2 × 10 21 atoms cm −2 ), the survival time of the 1 µm thick PHPS coating in space environment was predicted to be about 48 years.…”

Section: Ao and Ao + Vuv Erosionmentioning

confidence: 99%

“…Polymeric materials, relying on their good mechanical, chemical, and dielectric properties, are widely used on spacecraft to carry the flexible equipment, package the spacecraft, or reflect the solar radiation and so on [1,2]. The low Earth orbit (LEO) is typically used for the operation of various satellites.…”

Section: Introductionmentioning

confidence: 99%

The Atomic Oxygen Erosion Resistance Effect and Mechanism of the Perhydropolysilazane-Derived SiOx Coating Used on Polymeric Materials in Space Environment

Shi

Qian³

et al. 2022

Polymers

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In this work, the atomic oxygen (AO) erosion-resistance effect and mechanism of the Perhydropolysilazane (PHPS) coating were investigated from the perspective of element distribution in the depth direction. The results revealed that the coating demonstrated good adhesion and intrinsic AO erosion-resistance, which was attributed to the composition gradient formed in the coating. Moreover, the oxygen ratio of the SiOx on top layer of the coating could be elevated during AO exposure, strengthening the Ar ion etching durability of the coating. According to these results, an AO erosion-resistance mechanism model of the PHPS-derived SiOx coating was finally obtained.

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“…In recent times, colorless polyimides (CPIs) have been widely studied for applications in prospective flexible substrates of electronic and micro-optical devices [ 1 , 2 , 3 ]. They can be used in fields where glass is usually used such as in displays [ 4 , 5 ], memory [ 6 ], lighting, solar cells [ 7 ], etc. CPI combines excellent thermal and chemical resistances and the outstanding mechanical and electrical properties of traditional aromatic polyimide films (PIs), as well as having the advantages of common polymer optical films [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

High-Transparency and Colorless Polyimide Film Prepared by Inhibiting the Formation of Chromophores

Liu

Yue

et al. 2022

Polymers

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Colorless polyimides (CPIs) with outstanding mechanical properties are essential materials in the production of flexible display panels, foldable windows, and even spacecraft cockpits. This paper specifically elaborates that the Morkit unit, and azo and nitro chromophores are important factors contributing to yellow PI, together with the well-known charge transfer complex (CTC) theory. Three diamine monomers, two anhydrides monomers, and three blockers were used to inhibit chromophores formation and, thus, obtain CPI films. The cut-off wavelength was blue-shifts to 334 nm and the transmittance is improved to 98.9% in the UV–vis range. Mechanical and thermal properties of the CPI films are not reduced through coupling effects of the blockers. Therefore, the inhibition method of the Morkit units and chromophore groups is a promising process for preparing CPIs to be used as flexible display materials.

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Janus polyimide films with outstanding AO resistance, good optical transparency and high mechanical strength

Cited by 26 publications

References 40 publications

Mechanically Strong, Thermally Stable Gas Barrier Polyimide Membranes Derived from Carbon Nanotube-Based Nanofluids

Mechanically Strong, Thermally Stable Gas Barrier Polyimide Membranes Derived from Carbon Nanotube-Based Nanofluids

The Atomic Oxygen Erosion Resistance Effect and Mechanism of the Perhydropolysilazane-Derived SiOx Coating Used on Polymeric Materials in Space Environment

High-Transparency and Colorless Polyimide Film Prepared by Inhibiting the Formation of Chromophores

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