One-pot solvothermal synthesis of robust ambient-dried polyimide aerogels with morphology-enhanced superhydrophobicity for highly efficient continuous oil/water separation

Ning, Tianli; Yang, Guixia; Zhao, Wei; Liu, Xikui

doi:10.1016/j.reactfunctpolym.2017.04.017

Cited by 29 publications

(12 citation statements)

References 19 publications

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“…As one of the most attractive organic aerogels, polyimide (PI) aerogels composed of interconnected PI strands show exceptional low density, outstanding thermal stability, low dielectric constants, and high thermal insulation. − Owing to the 3D network structure and high porosity, PI aerogels, commonly produced via drying of poly(amic acid) synthesized from dianhydrides and diamines and annealing, can also be utilized as absorbents to separate oil and water. ,− However, PI networks usually exhibit an amphiphilic characteristic resulting from the presence of hydrophobic and hydrophilic groups. , To improve the hydrophobicity of PI aerogels, fluoridation and solvothermal synthesis strategies have been proposed. − He et al used fluoroalkylsilane to modify the surface of PI aerogels to achieve the superhydrophobic property . These aerogels showed efficient oil/water separation and reusability even at extremely high or low temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

Robust, Lightweight, Hydrophobic, and Fire-Retarded Polyimide/MXene Aerogels for Effective Oil/Water Separation

Wang

et al. 2019

ACS Appl. Mater. Interfaces

276

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Polyimide (PI) aerogels have attracted great attention owing to their low density and excellent thermal stability. However, hydrophobic surface modification is required for PI aerogels to improve their ability in oil/water separation due to their amphiphilic characteristic. Two-dimensional MXenes (transition metal carbides/nitrides) can be utilized as nanofillers to enhance the properties of polymers because of their unique layered structure and versatile interface chemistry. Herein, the robust, lightweight, and hydrophobic PI/MXene three-dimensional architectures were fabricated via freeze-drying of polyamide acid/MXene suspensions and thermal imidization. Polyamide acid was synthesized using N-N-dimethylacetamide and 4,4′-oxydianiline. MXene (Ti3C2T x ) dispersion was obtained via the etching of Ti3AlC2 and ultrasonic exfoliation. Taking advantage of the strong interaction between PI chains and MXene nanosheets, the interconnected, highly porous, and hydrophobic PI/MXene aerogels with low density were fabricated, resulting in the improved compressive performance, remarkable oil absorption capacity, and efficient separation of oil and water. For the PI/MXene-3 aerogel (weight ratio, 5.2:1) without any surface modification, the water contact angle was 119° with a density of 23 mg/cm3. This aerogel can completely recover to its original height after 50 compression–release cycles, exhibiting superelasticity and exceptional fatigue-resistant ability. It also showed high absorption capacities to various organic liquids ranging from approximately 18 to 58 times of their own weight. This hybrid aerogel can rapidly separate the chloroform, soybean oil, and liquid paraffin from the water–oil system. The thermally stable hybrid aerogel also exhibited excellent fire safety properties and outstanding reusability under an extreme environment.

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Section: Introductionmentioning

confidence: 99%

Robust, Lightweight, Hydrophobic, and Fire-Retarded Polyimide/MXene Aerogels for Effective Oil/Water Separation

Wang

et al. 2019

ACS Appl. Mater. Interfaces

276

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“…In this case, a hydrophilic surface in RF xerogels would be a disadvantage because the adsorbed water increases the conductivity of the material considerably; therefore, it would be mandatory to modify the original surface chemistry of RF xerogels to be used in this particular application. A hydrophobic surface is also clearly preferable when RF xerogels are used in applications such as adsorption or absorption of organic liquids and oils, transportation of nonpolar liquids in the nanoscale range in chemical and biotechnological applications, and adsorption of some toxic substances [21][22]. In these cases, the reversibility of the process itself would be even promoted by a reversibility of the surface chemistry of the materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of hydrophobic resorcinol–formaldehyde xerogels by grafting with silanes

Alonso-Buenaposada

Montes-Morán

Menéndez

et al. 2017

Reactive and Functional Polymers

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Hydrophilic organic xerogels were transformed into hydrophobic materials by treating them with hexamethyldisilazane. This transformation was performed by a simple one-pot process without modifying the previously designed porosity of the xerogel, at very soft operating conditions (80 ºC and atmospheric pressure) in the absence of catalyst or any other additional compound. Hexamethyldisilazane reacts with dangling hydroxyl surface groups, blocks the oxygen with methylsilane groups, and prevents the formation of hydrogen bonds with water molecules. The reaction proposed was corroborated chemically by X-ray photoelectron spectroscopy and thermogravimetric analysis coupled with a mass spectrometer. The porous structure of the organic xerogel determines the minimum time for the surface modification due to steric hindrance. Therefore, the former hydrophilic surface of the organic xerogel may be transformed into a hydrophobic one by a simple process, thus leading to the possibility of designing not only the porous structure but also the surface chemistry of the resorcinolformaldehyde xerogels to fit the requirements of an application.

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“…The polyimide aerogel is a comprehensive material with excellent mechanical properties and high heat stability (T d5 > 500 C), but it almost completely vaporizes at 700 C with no ablative thermal property. [18][19][20][21] Phenolic resins are widely used as ablative materials in the aerospace field, [22][23][24] e.g., Conformal Phenolic Incorporation of Carbon Ablator, a lightweight ablative material developed by the National Aeronautics and Space Administration Ames Research Center. 25,26 Ablative materials convert heat into mass and radiation on the material surface, which results in thermal protection via the consumption of the material itself and is the only feasible way to protect the payload in high-heat fluxes.…”

Section: Introductionmentioning

confidence: 99%

Silicon‐containing polyarylacetylene aerogel with heat resistance and ablative property for high‐temperature insulation

Zhao

Chen

Dong

et al. 2022

J of Applied Polymer Sci

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Owing to the high porosity and low thermal conductivity of organic aerogels, they have been widely used to develop lightweight heat insulation materials.However, their applications in high-temperature environments such as in aerospace applications are usually limited by the heat resistance or ablative property of the organic matrix. In this study, we prepared a novel organic aerogel for high-temperature insulation by the sol-gel method and freeze-drying. The matrix is the thermosetting silicon-containing polyarylacetylene (PSA) resin with excellent comprehensive properties, namely, high heat stability, low volatile component content, and high-temperature ceramic performance. The obtained PSA aerogel retains the heat resistance (T d5 = 634.8 C) and ablative properties (Y r800 = 92.6%) of the PSA resin, and the internal regular macropores and high porosity (70%) result in an extremely low weight (0.1200 g cm À3 ), low thermal conductivity (0.039 W m À1 K À1 )), and efficient heat insulation. Thus, this is an ideal material for high-temperature insulation in the aerospace field.

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One-pot solvothermal synthesis of robust ambient-dried polyimide aerogels with morphology-enhanced superhydrophobicity for highly efficient continuous oil/water separation

Cited by 29 publications

References 19 publications

Robust, Lightweight, Hydrophobic, and Fire-Retarded Polyimide/MXene Aerogels for Effective Oil/Water Separation

Robust, Lightweight, Hydrophobic, and Fire-Retarded Polyimide/MXene Aerogels for Effective Oil/Water Separation

Synthesis of hydrophobic resorcinol–formaldehyde xerogels by grafting with silanes

Silicon‐containing polyarylacetylene aerogel with heat resistance and ablative property for high‐temperature insulation

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