Rigid and flexible polyimide aerogels with less fatigue for use in harsh conditions

Yuan, Ruxun; Zhou, Yu; Lü, Xuemin; Dong, Zhaoshi; Lu, Qinghua

doi:10.1016/j.cej.2021.131193

Cited by 29 publications

(18 citation statements)

References 53 publications

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“…As an engineering plastic, polyimide (PI) has excellent mechanical property, thermal stability, radiation resistance, and chemical stability and is widely used as an aerogel material. , Because of its unique molecular structure, PI is difficult to dissolve in many organic solvents to fabricate aerogel. The feasible way is to introduce hydrophilic units through structural design to dissolve PI or to prepare PI aerogels by imidization starting from polyamic acid (PAA). , The former method is expensive and difficult to produce on a large scale.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Properties of Polyimide/Carbon Fiber Aerogel and the Derivative Carbon Aerogel

Liu

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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In this study, polyimide (PI)/carbon fiber (CF) aerogel was fabricated via a freeze-drying method. The introduction of CF endows PI aerogels with good dimensional stability in the thermal imidization process. The resulting aerogel possesses excellent mechanical property (as high as 58.45 MPa) and good hydrophobic property (contact angle above 120°). The PI/CF aerogel also has very good radiation resistance, with a compressive modulus of 50.45 MPa even after 10 MGy irradiation, which is 86.53% of the initial modulus. These characteristics make the PI/CF aerogel very suitable for applications in radiation environment. Subsequently, a carbon aerogel with high temperature resistance and good mechanical properties was obtained by carbonization of the PI/CF aerogel. Its comprehensive property is comparable to traditional porous carbon-bonded carbon fiber composites.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Properties of Polyimide/Carbon Fiber Aerogel and the Derivative Carbon Aerogel

Liu

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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“…Based on water-soluble PI precursors, the technique of freeze-casting is also widely used to fabricate PIA, 9,10 and various nanomaterials such as MXene, 11 graphene, 12 and nanobers 13 were introduced to prepare exible aerogel composites. Nevertheless, elaborately directional freezing methods are mainly applied for anisotropic structural design to obtain high-performance properties, [13][14][15][16] and the annealing aerwards would cause signicant shrinkage up to 40%. 13,17,18 Inorganic aerogels like SiO 2 , Al 2 O 3 , and ZrO 2 have advantages for high-temperature thermal protection, [19][20][21] whereas their practical applications are signicantly restrained by their inherent fragility and weak mechanical properties resulting from high porosity.…”

Section: Introductionmentioning

confidence: 99%

Flexible and interlocked quartz fibre reinforced dual polyimide network for high-temperature thermal protection

et al. 2023

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“…[15][16][17][18] Furthermore, 3D porous framework structures are prone to changes in their mechanical response, which for example manifests as cyclic softening, i.e., the decrease in stress at a given strain upon repeated deformation. [13,19,20] And finally, the conductivity of CP foam-like structures and their composites are prone to water absorption, which can be utilized for sensing applications, [21][22][23] but makes its electrical properties dependent on ambient humidity.…”

Section: Introductionmentioning

confidence: 99%

Strain‐Invariant, Highly Water Stable All‐Organic Soft Conductors Based on Ultralight Multi‐Layered Foam‐Like Framework Structures

Barg

Kohlmann

Rasch

et al. 2023

Adv Funct Materials

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Soft and flexible conductors are essential for the development of soft robots, wearable electronics, electronic tissue, and implants. However, conventional soft conductors are inherently characterized by a large change in conductance upon mechanical deformation or under alternating environmental conditions, e.g., humidity, drastically limiting their application potential. This work demonstrates a novel concept for the development of strain‐invariant, highly elastic and highly water stable all‐organic soft conductors, overcoming the limitations of previous strain‐invariant soft conductors. For the first time, thin film deposition technologies are combined in a three‐dimensional fashion, resulting in micro‐ and nano‐engineered, multi‐layered (<50 nm), ultra‐lightweight (< 15 mg cm−3) foam‐like framework structures based on Poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) and Polytetrafluoroethylene (PTFE), characterized by a highly strain‐invariant conductivity (≈184 S/m) between 80% compressive and 25% tensile strain. Both the initial electrical and mechanical properties are retained during long‐term cycling, even after 2000 cycles at 50% compression. Furthermore, the PTFE thin film renders the framework structure highly hydrophobic, resulting in stable electrical properties, even when immersed in water for a month. Such innovative multi‐scaled and multi‐layered functional materials are of interest for a broad range of applications in soft electronics, energy storage and conversion, sensing, water and air purification, as well as biomedicine.

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Rigid and flexible polyimide aerogels with less fatigue for use in harsh conditions

Cited by 29 publications

References 53 publications

Fabrication and Properties of Polyimide/Carbon Fiber Aerogel and the Derivative Carbon Aerogel

Fabrication and Properties of Polyimide/Carbon Fiber Aerogel and the Derivative Carbon Aerogel

Flexible and interlocked quartz fibre reinforced dual polyimide network for high-temperature thermal protection

Strain‐Invariant, Highly Water Stable All‐Organic Soft Conductors Based on Ultralight Multi‐Layered Foam‐Like Framework Structures

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