Polyimide Aerogel Fibers with Controllable Porous Microstructure for Super-Thermal Insulation Under Extreme Environments

Xue, Tiantian; Zhu, Chenyu; Feng, Xueling; Wali, Qamar; Fan, Wei; Liu, Tianxi

doi:10.1007/s42765-022-00145-8

Cited by 76 publications

(46 citation statements)

References 44 publications

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“…The poly (amic acid) (PAA) salt precursors are prepared based on previous work [30][31][32]. 0.5 g PAA was first dispersed in 10 mL MXene suspension (50 mg mL −1 ) and stirred for 6 h to obtain MXene/CNT/PAA-0 composite ink.…”

Section: Preparation Of the Mxene/cnt/paa Composite Inksmentioning

confidence: 99%

3D Printed Integrated Gradient-Conductive MXene/CNT/Polyimide Aerogel Frames for Electromagnetic Interference Shielding with Ultra-Low Reflection

et al. 2023

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Construction of advanced electromagnetic interference (EMI) shielding materials with miniaturized, programmable structure and low reflection are promising but challenging. Herein, an integrated transition-metal carbides/carbon nanotube/polyimide (gradient-conductive MXene/CNT/PI, GCMCP) aerogel frame with hierarchical porous structure and gradient-conductivity has been constructed to achieve EMI shielding with ultra-low reflection. The gradient-conductive structures are obtained by continuous 3D printing of MXene/CNT/poly (amic acid) inks with different CNT contents, where the slightly conductive top layer serves as EM absorption layer and the highly conductive bottom layer as reflection layer. In addition, the hierarchical porous structure could extend the EM dissipation path and dissipate EM by multiple reflections. Consequently, the GCMCP aerogel frames exhibit an excellent average EMI shielding efficiency (68.2 dB) and low reflection (R = 0.23). Furthermore, the GCMCP aerogel frames with miniaturized and programmable structures can be used as EMI shielding gaskets and effectively block wireless power transmission, which shows a prosperous application prospect in defense industry and aerospace.

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Section: Preparation Of the Mxene/cnt/paa Composite Inksmentioning

confidence: 99%

3D Printed Integrated Gradient-Conductive MXene/CNT/Polyimide Aerogel Frames for Electromagnetic Interference Shielding with Ultra-Low Reflection

et al. 2023

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“…Since the thermal conductivity of air is much smaller than that of solids, the heat conduction of biomimetic fibers with high porosity is significantly reduced. 41 In addition, the submicron pores in the fiber wall are close to the mean free path of gas molecules in the air, suppressing the thermal convection. Based on the above discussion, the cellular hollow biomimetic fiber effectively block heat transfer, making it conducive to the thermal insulation of human body.…”

Section: Thermal Insulation Properties Of Biomimetic Textilementioning

confidence: 99%

Large‐scalable polar bear hair‐like cellular hollow fibers with excellent thermal insulation and ductility

Wang

Chi

Liu

et al. 2022

J of Applied Polymer Sci

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Passive warm‐keeping textiles could reduce carbon emissions by turning down indoor heating in winter. Polar bear hair exhibits a unique structure composed of a hollow core and an aligned porous shell, which extremely helps to resist heat transport. Great interest has arisen in the development of thermo‐insulating textiles with this biomimetic structure. In this work, cellular hollow fibers were made by a large‐scalable wet spinning‐foaming process. This efficient method achieved rapid formation of polar bear hair‐like fiber as well as facile turning properties of the fibers. The structure and properties of biomimetic fibers depended on the content of foaming agent. As‐prepared porous thermoplastic polyurethane (TPU)/polyacrylonitrile (PAN) composited fiber showed excellent ductility. The maximum tensile strength and breaking elongation was 4.31 MPa and 121%, respectively. The corresponding woven textile exhibited excellent thermal insulation properties even under deformation by compression or tension. The temperature difference across the thickness of textile was 17.9 and 34.9°C under a background temperature of 0 and 80°C, respectively. It may pave the way to fabricate new structure–function integrated fiber materials for warm‐keeping textiles.

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“…In recent years, aerogel fiber, one-dimensional aerogel material, inheriting the merits of aerogel materials, for instance, high porosity, large specific surface area, and low density, arouses wide interest in thermal insulation, electromagnetic shielding, and adsorption fields. − In particular, the thermal conductivity of aerogel fibers can be effectively limited because the porous structure restricts air convection, heat radiation, and thermal conduction. , Therefore, aerogel fiber is considered a promising candidate for thermally insulating clothing. Various aerogel fibers have been developed based on different raw materials and preparation techniques, including cellulose, silk fibroin, Kevlar, polyimide, etc.…”

Section: Introductionmentioning

confidence: 99%

“…17−19 In particular, the thermal conductivity of aerogel fibers can be effectively limited because the porous structure restricts air convection, heat radiation, and thermal conduction. 20,21 Therefore, aerogel fiber is considered a promising candidate for thermally insulating clothing. Various aerogel fibers have been developed based on different raw materials and preparation techniques, including cellulose, 22 silk fibroin, 23 Kevlar, 24 polyimide, 25 them, polyimide aerogel fibers show superior mechanical performance and thermal insulation effects.…”

Section: Introductionmentioning

confidence: 99%

Mechanically Strong and Thermally Insulating Polyimide Aerogel Fibers Reinforced by Prefabricated Long Polyimide Fibers

Zhu

Xue

et al. 2023

ACS Appl. Mater. Interfaces

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Aerogel fibers inherit the merits of aerogel and fibrous materials, such as high porosity and satisfactory knittability, demonstrating great potential as thermal protective materials applied in harsh environments. Nevertheless, the inferior mechanical property resulting from the porous structure immensely hampers the practical application of aerogel fibers. Herein, we develop robust and thermally insulating long polyimide fiber-reinforced polyimide composite aerogel fibers (LPF-PAFs). The porous crosslinked polyimide aerogel as the sheath endows LPF-PAFs with good thermal insulation performance, while the long polyimide fibers as the core provide LPF-PAFs with superior mechanical strength. Due to the introduction of the high-strength long polyimide fibers to undertake significant stress, LPF-PAFs display outstanding strength surpassing 150 MPa without obvious mechanical performance degeneration in a wide range of temperatures from −100 to 300 °C. Moreover, the textile woven by LPF-PAFs exhibits a superior thermal insulation ability and stability to cotton textile at 200 and −100 °C, indicating its potential application in thermal protective clothing under extreme environments.

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Polyimide Aerogel Fibers with Controllable Porous Microstructure for Super-Thermal Insulation Under Extreme Environments

Cited by 76 publications

References 44 publications

3D Printed Integrated Gradient-Conductive MXene/CNT/Polyimide Aerogel Frames for Electromagnetic Interference Shielding with Ultra-Low Reflection

3D Printed Integrated Gradient-Conductive MXene/CNT/Polyimide Aerogel Frames for Electromagnetic Interference Shielding with Ultra-Low Reflection

Large‐scalable polar bear hair‐like cellular hollow fibers with excellent thermal insulation and ductility

Mechanically Strong and Thermally Insulating Polyimide Aerogel Fibers Reinforced by Prefabricated Long Polyimide Fibers

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