Facile strategy to prepare polyimide nanofiber assembled aerogel for effective airborne particles filtration

Qiao, Shiya; Kang, Shuai; Zhu, Jing; Wang, Yan; Yu, Junrong; Hu, Zuming

doi:10.1016/j.jhazmat.2021.125739

Cited by 40 publications

(10 citation statements)

References 36 publications

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“…Due to their unique nano-porous nature, ultralight densities, low thermal conductivity, etc., polymer aerogels have received a lot of attention in the fields of thermal insulation, catalysis, waste disposal, and so on. [1][2][3][4] Up to now, there are a DOI: 10.1002/mame.202100645 wide variety of polymer aerogels available, such as those derived from phenolic resins (PR), [5] polybenzoxazines (PBO), [6,7] polyureas (PUA), [8] Kevlarlike polyamides (PPTA), [9,10] polyimides (PI), [11][12][13] polyurethanes (PU), [14] etc. Among them, PI aerogels are very attractive due to their superior mechanical and thermal insulation properties, and can find diverse applications such as extravehicular activity (EVA) suits, thermal protective systems (TPS), submarine sound barrier systems, etc.…”

Section: Introductionmentioning

confidence: 99%

Melamine‐Crosslinked Polyimide Aerogels from Supercritical Ethanol Drying with Improved In‐Use Shape Stability Against Shrinking

Chen

Liu

Sun

et al. 2021

Macro Materials & Eng

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Polyimide aerogels are promising for diverse applications owing to their nano-porous structure and superior properties. However, the shrinkage of melamine-crosslinked polyimide (MPI) aerogels has greatly compromised their performance in practical applications. In this study, supercritical drying with ethanol rather than CO 2 is employed to enhance their in-use shape stability at high temperatures. The structure, thermal insulation, mechanical strength of the resultant aerogels as well as their shape stability are characterized. Experimental results reveal that the shape stability of MPI aerogels during use is greatly improved thanks to the in-advance baptism of supercritical ethanol drying. The aerogel shrinks by only 2.64 vol.% after being treated at 280 °C for 72 h. Besides, the MPI aerogel shows enhanced compressive strength and can easily support a load more than 20 000 times its own weight. The thermal conductivity of these aerogels varies from 0.034 to 0.046 W m −1 k −1 , indicative of remarkable performance in thermal insulation. In addition, the aerogels that started to decompose at as high as 500 °C also perform well in thermal stability and char forming. It can be envisaged that the developed MPI aerogels with greatly improved in-use shape stability may have broad prospects for thermal insulation at high temperatures.

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Section: Introductionmentioning

confidence: 99%

Melamine‐Crosslinked Polyimide Aerogels from Supercritical Ethanol Drying with Improved In‐Use Shape Stability Against Shrinking

Chen

Liu

Sun

et al. 2021

Macro Materials & Eng

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“…However, this material has high density, leading to an increase in thermal conductivity. Polyimide (PI) nanofiber aerogels that combine high thermal stability and glass transition temperature with lightweight, flexible, and thermal insulation for aerospace and other applications have a great amount of interesting work which has been reported by several research groups. − In previous studies, PI aerogels manufactured from different chemistries and starting monomers via an imidization process possessed large shrinkage (30–50%) during PI aerogel formation. − Greiner et al manufactured PI nanofiber aerogel from poly(amic acid) PAA and pyromellitic dianhydride via electrospinning and an imidization reaction based on the concept of “self-gluing” the fibrous network skeleton of PI during sponge formation . Thermal imidization using the protocol with the annealing specimen at high temperature caused shrinkage and setback the mechanical stability during PI aerogel formation.…”

Section: Introductionmentioning

confidence: 99%

Cross-linked Polyimide Nanofibrous Aerogels with Hierarchical Cellular Structure for Thermal Insulation

Thi Khuat,

Doan,

Phong Vo

et al. 2023

ACS Appl. Polym. Mater.

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Due to their low bulk density, high porosity, and functional performance, aerogels are ideal candidates for a variety of applications. However, their potential application in a variety of fields is limited by their time-consuming and costly complex fabrication process. In this study, electrospun 3-aminopropyltriethoxysilane-grafted polyimide (PI@APTES) nanofibers were used to construct nanofibrous aerogels (NFAs) via freeze-drying a dispersion of cross-linked-PI short fibers and a binder (PI@APTES), resulting in improved properties and functionalities. A highly siloxane cross-linked network structure was formed by hydrolysis and condensation reactions to generate stable nanofibrous aerogels. The obtained polyimide nanofibrous aerogels (PiNFAs) had a hierarchically three-dimensional (3D) microporous structure, high porosity (over 98%), tunable densities (10.6 ± 0.7–13.6 ± 0.2 mg cm–3), solvent resistance, superhydrophobicity (water contact angle over 163°), low thermal conductivity (as low as 33.2 mW m–1 K–1), and mechanical stability. These PiNFAs are promising candidates for potential applications in thermal insulation, lightweight construction, filtration, and sensors.

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“…The resultant NFAs exhibited not only a high filtration efficiency (99.83%) for PM2.5 but also excellent thermal stability (300 C). 38 Moreover, the functionality of NFA-based filters can be further adjusted using a variety of surface modification strategies. For example, Liu et al fabricated ZIF-8/PI NFA based high-temperature air filters by compounding ZIF-8 nanoparticles with PI NFAs.…”

Section: Introductionmentioning

confidence: 99%

Preparation of multifunctional Ag@PAN/PBA nanofibrous aerogel membranes for efficient PM 0.3 capture and effective antibacterial activity

Jiang

Wang

Liao

et al. 2023

J of Applied Polymer Sci

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Nanofibrous aerogels (NFAs) have great application potential in air filtration due to their unique hierarchical porous structure and high porosity. However, the development of air filter with high air filtration efficiency, as well as good antibacterial activity, remains a major challenge. In an effort to overcome this challenge, here we report a facile methodology for the fabrication of robust and flexible nanofibrous aerogel membranes (NFAMs) with a three‐dimensional (3D) hierarchical porous structure. Moreover, the microstructures and filtration performance of the obtained NFAMs could be easily tuned by adjusting the nanofiber concentration in the aerogel. The resultant Ag@PAN/PBA NFAMs had high filtration efficiency (99.82%) towards PM0.3, low pressure drop (134 Pa) and desirable quality factor (0.0472 Pa−1) under an airflow velocity of 32 L/min. Furthermore, the NFAMs also exhibited excellent antibacterial activities against Escherichia coli (99.46%) and Staphylococcus aureus (99.72%). Together, the results presented here suggest that Ag@PAN/PBA NFAMs have great potential in public health protection applications.

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Facile strategy to prepare polyimide nanofiber assembled aerogel for effective airborne particles filtration

Cited by 40 publications

References 36 publications

Melamine‐Crosslinked Polyimide Aerogels from Supercritical Ethanol Drying with Improved In‐Use Shape Stability Against Shrinking

Melamine‐Crosslinked Polyimide Aerogels from Supercritical Ethanol Drying with Improved In‐Use Shape Stability Against Shrinking

Cross-linked Polyimide Nanofibrous Aerogels with Hierarchical Cellular Structure for Thermal Insulation

Preparation of multifunctional Ag@PAN/PBA nanofibrous aerogel membranes for efficient PM 0.3 capture and effective antibacterial activity

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