Porous highly fluorinated polyimide/polydopamine nanocomposite films with simultaneously enhanced toughness, UV-shielding and photostability for aerospace applications

Li, Qing; Guo, Yujuan; Ouyang, Chaoliu; Yi, Shunmin; Liu, Sheng

doi:10.1016/j.polymertesting.2022.107899

Cited by 19 publications

(16 citation statements)

References 67 publications

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“…The changes of infrared and morphology before and after ultraviolet irradiation were investigated. The specific steps were referred to our previous work …”

Section: Methodsmentioning

confidence: 99%

“…A decomposition experiment of curcumin was designed to estimate the UV shielding property of FPI and FPI/ASE films. The detailed experimental steps were referred to our previous work . The procedures were basically the same, except that the lighting time was changed to 50 min per round and 10 times in the cycle test.…”

Section: Methodsmentioning

confidence: 99%

“…The detailed experimental steps were referred to our previous work. 51 The procedures were basically the same, except that the lighting time was changed to 50 min per round and 10 times in the cycle test.…”

Section: Experimental Section 21 Uv-shielding Measurementmentioning

confidence: 99%

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Fluorinated Polyimide/Sepia Eumelanin Nanocomposites for Aerospace Applications

Guo

et al. 2023

ACS Appl. Polym. Mater.

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Natural marine sepia eumelanin-derived additives (ASE) were used as a filler to modify highly fluorinated polyimide (FPI), acquiring the enhanced comprehensive performance by chemical bonding and pore structure construction. Stress−strain curves indicated an optimal tensile strength of 108.25 MPa and a fracture elongation of 4.83% (1 wt % ASE), respectively, 1.30 and 1.34× that of pure FPI. Thermal analysis showed that T g was as high as 360.1, 14.4 °C higher than that of pristine FPI. The exceptional UV-shielding capabilities of the FPI/ASE films were confirmed by measurements of curcumin photodegradation, durability, and so on. FTIR and AFM manifested their superior photostability with basically unchanged carbonyl absorption peaks and much less variation in surface roughness after UV exposure for 720 h. To sum up, the covalent network structure between FPI and ASE contributed to the improvement of mechanical and thermal properties. The mechanisms, such as synergistic UV absorption of FPI and ASE, photothermal conversion, and ASE's free radical trapping ability, were responsible for the remarkable UV-shielding and light stability. The above remarkable comprehensive performance makes the FPI/ASE film a candidate for UV shielding in aerospace applications.

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“…The changes of infrared and morphology before and after ultraviolet irradiation were investigated. The specific steps were referred to our previous work …”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Fluorinated Polyimide/Sepia Eumelanin Nanocomposites for Aerospace Applications

Guo

et al. 2023

ACS Appl. Polym. Mater.

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“…From the above-mentioned data, with an increase in temperature, there is a clear rate increase in the removal of compounds MB and 4-NP using Ag/SE. SE is also the brown-black melanin of natural melanin, which has excellent free radical trapping and UV absorption properties, that is, the Ag/SE catalyst can absorb sunlight and convert it into heat with the irradiation of sunlight , and then promote the catalytic reaction. Then, using ultraviolet light to illuminate SE powder, from the corresponding infrared thermal imaging (Figure a,b), it can be seen that the SE surface rapidly converts light energy into heat energy.…”

Section: Resultsmentioning

confidence: 99%

“…The rise in temperature generally leads to an increase in the entropy of chemical reactions, acceleration of electron transfer, and promotion of the rate of macroscopic reactions. Broadly, light-to-heat materials can be classified into four categories: noble metal nanoparticles (such as Ag), semiconductor nanomaterials (such as MoS 2 ), carbon-based nanomaterials (such as graphene), and polymers (such as polydopamine , ). Specifically, SE, which shares similar properties with polydopamine, , is not only an ideal candidate material for constructing carrier catalysts because of its exceptional light-to-heat performance but also due to its environmentally friendly, cost-effective, and high-performance attributes.…”

Section: Introductionmentioning

confidence: 99%

Silver Nanocatalysts Supported by Multiple Melanin Carriers with a Photothermal Effect for Reduction of Methylene Blue and 4-Nitrophenol

Liu,

Deng,

Guo

et al. 2023

ACS Appl. Nano Mater.

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Although the photothermal effect can effectively enhance catalytic wastewater treatment reactions, the development of high-efficiency, low-cost, and stable catalysts with a photothermal effect still presents a challenging endeavor. Through the utilization of an in situ reduction strategy, an economical and convenient modification of small-sized silver (Ag) nanoparticles (NPs) on sepia eumelanin (SE) and artificial allomelanin (AMNP) supports was achieved, leading to the formation of Ag/SE and Ag/ AMNP nanocomposite materials. Simultaneously, Ag/AMNPs lacking nitrogen elements were employed as a control, and the contribution of nitrogen-containing groups in Ag/SE to the loading of Ag NPs was investigated. Unique SE nanospheres with high surface area exhibited excellent light absorptivity and photogenerated carrier separation efficiency as well as superior light-driven thermogenesis, which can further increase the temperature of the reaction system to accelerate the catalytic reduction of MB (5 min, 80 × 10 −2 min −1 ) and 4-NP (240 s, 14.12 × 10 −3 s −1 ). A possible mechanism for the synergistic action of photothermal catalysis is proposed. This study demonstrates that SE not only serves as an effective support for immobilized silver NPs but also functions as a photothermal conversion center, thereby enhancing catalytic reactions. This provides a promising avenue for the design of stable catalyst composites with high-performance photothermal synergistic catalysis.

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A facile in‐situ fabrication of black polyimide films with ultrahigh electrical properties

Weng,

Liu,

Zhang

et al. 2024

J of Applied Polymer Sci

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Considering the ongoing evolution of flexible printed circuit boards and the importance of safeguarding the intellectual property of circuit designs, there exists an imperative demand for the development of a black film exhibiting exceptional electrical properties and remarkable light‐shielding capabilities. Consequently, this work employs a straightforward strategy to enhance the opacity of polyimide films by incorporating carbon black (CB) and manganese dioxide (MnO2) as black fillers using an in situ doping method. Rigorous tests are conducted, analyzing properties such as dielectric constant, dielectric loss, breakdown field strength, current density, and ferroelectric energy storage. The optimal ratio of CB to MnO2 (mass fraction) is determined as 1:5, with a total powder doping amount of 6 wt%, providing the best ratio relative to the matrix resin. This ratio ensures an optimal powder dispersion state, resulting in an outstanding breakdown field of 147.4 kV/mm and ultralow dielectric constants, measuring less than 3.78 at 103 Hz. This composite film is anticipated to find applications as a cutting‐edge material for electronic devices and the semiconductor industry.

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Porous highly fluorinated polyimide/polydopamine nanocomposite films with simultaneously enhanced toughness, UV-shielding and photostability for aerospace applications

Cited by 19 publications

References 67 publications

Fluorinated Polyimide/Sepia Eumelanin Nanocomposites for Aerospace Applications

Fluorinated Polyimide/Sepia Eumelanin Nanocomposites for Aerospace Applications

Silver Nanocatalysts Supported by Multiple Melanin Carriers with a Photothermal Effect for Reduction of Methylene Blue and 4-Nitrophenol

A facile in‐situ fabrication of black polyimide films with ultrahigh electrical properties

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