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 (Ti3C2Tx) 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.

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

Low density and high strength nanofibrillated cellulose aerogel for thermal insulation application

Progress in low dielectric polyimide film – A review

Ultralow dielectric constant polyarylene ether nitrile foam with excellent mechanical properties

This paper presents a novel aerogel-based Triboelectric Nanogenerator (TENG) which shows a superior performance for energy harvesting and sensing applications. Polyimide-based aerogel film with varying open-cell content level is developed to be used as the main contact material for the TENG. The fabricated aerogel film is fully characterized to reveal the chemical and mechanical properties of the developed material. It is shown the use of Polyimide aerogel film remarkably enhances the performance of the TENG compared to a TENG with fully dense Polyimide layer with no porosity. This enhancement is due to the increase on the effective surface area, charge generation inside the open-cells of the aerogel, and increase on the relative capacitance of the TENG device. The effect of varying porosity from zero to 70% of open-cell content reveals that the aerogel film with 50% shows the highest performance where the peak open-circuit voltage of 40V and peak short-circuit current of 5 μA are obtained. These values are higher than those of the TENG with simple Polyimide layer with an order of magnitude. Finally, the performance of proposed TENG under resistive loads and capacitors are tested. Thus, this work presents an effective method for high performance TENG.

/pdf/a-high-performance-triboelectric-nanogenerator-using-porous-2u03a5vwe9.pdf

A High Performance Triboelectric Nanogenerator Using Porous Polyimide Aerogel Film.

Low dielectric constant and moisture-resistant polyimide aerogels containing trifluoromethyl pendent groups

The invention relates to a method for preparing polyamide-imide copolymer fibers. The method comprises the steps that diamine monomers are added to an aprotic polar solvent, stirring is carried out at the temperature of -5 DEG C to 100 DEG C under nitrogen protection, dianhydride monomers are added for reacting, then paraphthaloyl chloride is added at the temperature of -10 DEG C to 20 DEG C, and reacting is carried out to obtain polyamide-polyamide acid polymer spinning solution; the spinning solution stands still for deaeration, and enters an inert gas channel of 140 DEG C to 380 DEG C after passing through a filtering and spinning assembly, cured raw yarn is obtained, and partially-cyclized precursor nascent fibers are obtained through winding; the nascent fibers are cyclized and drafted through the process of cyclizing and drafting integration. The method for preparing the polyamide-imide copolymer fibers is simple in process and high in efficiency, the obtained polyamide-imide copolymer fibers have the advantages of being high in strength and modulus, and resistant to irradiation and high temperature, and a new thought is provided for preparation of polyamideimide fibers.

Method for preparing polyamide-imide copolymer fibers

The invention relates to a preparation method of polyimide aerogel. The preparation method comprises the following steps: under an inert gas atmosphere, dissolving dianhydride and a diamine monomer into a solvent; stirring at room temperature and stirring in an ice-water bath to obtain a PAA (Polyacrylic Acid) solution; adding NH2-HBPSiF to obtain a mixed solution; stirring for 4h to 8h to obtain a gel substance; adding pyridine and an acetic anhydride solution; stirring at 55 DEG C to 65 DEG C for 5min to 15min; standing under a sealed condition to obtain polyimide wet gel; carrying out solvent displacement on the polyimide wet gel by adopting a stepwise dilution method, and carrying out CO2 supercritical drying to obtain the polyimide aerogel. The method provided by the invention has a simple process and controllable cross-linking density and is especially suitable for preparation of the polyimide aerogel with super-hydrophobic and low-dielectric characteristics.

Preparation method of polyimide aerogel

The invention relates to a method for preparing polyamideimide precipitation fibers. The method comprises the steps that under the deoxygenation protection of nitrogen of 0 DEG C to 5 DEG C, diamine monomers and dianhydride monomers are added to an aprotic polar solvent, compound additives are added, stirring is carried out under nitrogen protection, and a polymerization reaction is carried out for 3 h to 10 h; a chemical cyclizing catalyst is dropped in, stirring is carried out in a condensation backflow device for staged warming polymerization, and a polyamideimide spinning solution is obtained; filtering, deaeration and dilution are carried out, the polyamideimide spinning solution is injected into a stirred precipitation solution through an injector, and polyamideimide precipitation fiber suspension liquid is obtained; the polyamideimide precipitation fibers are obtained after washing, filtering and drying. According to the method, the polyamideimide solution is synthesized by the diamine monomers and the dianhydride monomers through a one-step method, cost is low, the cyclization reaction is achieved in the polymerization stage to directly obtain the polyamideimide solution, the molecular weight is high, operation is easy, traditional heat performance, irradiation resisting performance and other excellent performance are reserved in the obtained precipitation fibers, and the precipitation fibers can be further directly used for preparing high-performance paper.

Method for preparing polyamideimide precipitation fibers

The invention relates to a method for preparing a nanoporous polyimide aerogel. The method comprises the following steps: adding a diamine monomer to a solvent in a nitrogen atmosphere, stirring at a temperature of 0 to 60 DEG C for 3 to 6h, and then adding a dianhydride monomer to obtain a mixed solution, and reacting for 2 to 6h to obtain a PAA stock solution; adding a ultraviolet light curing agent and modified attapulgite into the PAA stock solution, and adding a chemical cyclization agent to obtain a polyimide solution, and then pouring into a mold, curing with ultraviolet light to obtain a polyimide wet gel; aging the polyimide wet gel at room temperature in the mold, and then carrying out solvent replacement, and carrying out supercritical carbon dioxide drying to obtain a nanoporous polyimide aerogel. The method provided by the invention has the advantages of simple process and wide raw material source, and the obtained nanoporous polyimide aerogel is expected to be used in the field of high temperature insulation.

Method for preparing nanoporous polyimide aerogel

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