1524 results about "Polyacrylonitrile" patented technology

The invention provides weather-resistant anti-freezing road concrete and a preparation method thereof, and belongs to the technical field of concrete. The concrete comprises the following components: sulphoaluminate cement, Portland cement, silica fume, fly ash, modified granite gravel coarse aggregate, medium sand fine aggregate, silica fume blended fiber, silica fume blended polyacrylonitrile fiber, a composite air entraining agent, a functional modifier, a composite antifreeze agent, pre-absorbent zeolite powder and the like. The preparation method comprises the following steps: modifying granite macadam with Al (H2PO4) 3, SiO2 and methoxypolyethylene glycol triethoxysilane, and modifying with a lithium silicate aqueous solution to obtain the modified granite macadam coarse aggregate. The composite air entraining agent comprises a JRY-Q air entraining agent and sodium alpha-olefin sulfonate. The functional modifier is prepared from gas phase method spherical nano silicon dioxide and nano alpha-Al2O3. The composite antifreeze agent comprises ethylene glycol butyl ether acetate and modified calcium carbonate. The modified calcium carbonate is obtained by sequentially modifying nano calcium carbonate with calcium chloride, a KH-550 silane coupling agent and stearic acid.

The invention discloses a polyacrylonitrile carbon fiber and a preparation method thereof, and the method comprises the following steps: (1) copolymerizing acrylonitrile and acrylamidine to obtain a polymer spinning solution; (2) sequentially carrying out spinning, solidification forming, first-stage drafting, washing, oiling, drying, second-stage drafting and heat setting on the polymer spinning solution to obtain a polyacrylonitrile precursor; and (3) sequentially carrying out pre-oxidation and carbonization treatment on the polyacrylonitrile precursor to obtain the polyacrylonitrile carbon fiber. Therefore, by adopting the method, the radial structure difference of the nascent fiber can be effectively controlled, the radial structure of the obtained nascent fiber is more homogeneous, and the radially homogeneous polyacrylonitrile precursor is obtained, so that the prepared carbon fiber is more excellent in performance or larger in diameter, and meanwhile, an ammonification process link is omitted.

The invention belongs to the technical field of wall joint filling, and relates to a wall cracking joint filling agent and a wall joint filling process, the wall cracking joint filling agent comprises a cement-based cementing material, fine aggregate, modified toughening fiber, modified nano zinc oxide, a dispersing agent, a defoaming agent, a water-retaining agent and a mildew preventive; the modified toughened fiber is obtained by sequentially carrying out alkali etching, dopamine coating and intercalated kaolin loading on polyacrylonitrile fiber; the modified nano-zinc oxide is obtained by modifying nano-zinc oxide through a silane coupling agent and coating and modifying the nano-zinc oxide through chitosan. According to the wall crack repairing agent provided by the invention, the modified toughening fibers and the modified nano zinc oxide which are subjected to surface functionalization treatment are introduced, so that the crack resistance and toughness of a cement-based crack repairing material can be remarkably improved, the occurrence probability of secondary cracking after repairing can be remarkably reduced, meanwhile, lasting and effective mildew-proof and antibacterial capabilities can be provided, microbial erosion can be inhibited, and the service life of the wall crack repairing agent is prolonged. And good construction operability and basic mechanical properties of the material are maintained.

The invention relates to a preparation method of a carbon fiber reinforced carbon aerogel heat insulation composite material, which comprises the following steps: firstly, pre-oxidizing a commercial polyacrylonitrile (PAN) needled felt reinforcement at 195-255 DEG C to obtain pre-oxidized felt reinforcements with different pre-oxidation degrees; uniformly mixing phenolic resin serving as an organic sol raw material, hexamethylenetetramine serving as a cross-linking curing agent and normal propyl alcohol serving as a solvent according to a proper proportion to form organic sol; secondly, the pre-oxidized felt blank body is placed in a stainless steel mold, organic sol is poured into the stainless steel mold, the pre-oxidized felt is completely immersed in the sol, and the pre-oxidized felt reinforcement is fully soaked in the organic sol under the vacuum negative pressure condition; sealing the stainless steel mold dipped with the pre-oxidized felt, and curing and aging for 40-80 hours at 80 DEG C to obtain pre-oxidized felt reinforced organic wet gel; placing the wet gel at room temperature for 24 hours, and drying the wet gel in an air dry oven at 60 DEG C for 72 hours to obtain pre-oxidized felt reinforced organic aerogel; and finally, carbonizing the pre-oxidized felt reinforced organic aerogel at 850-1100 DEG C for 3 hours by using a vacuum carbonization furnace at a heating rate of 3-5 DEG C / min to obtain the carbon fiber reinforced carbon aerogel composite material.

The invention belongs to the technical field of novel adsorption materials, and particularly relates to needle-punched cloth for extracting uranium from seawater based on dry-process PAN fibers and a preparation method and application of the needle-punched cloth. The needle-punched fabric for extracting uranium from seawater comprises chemical modified functional fibers and supporting fibers, the chemically modified functional fiber with amidoxime groups is obtained by chemically modifying a dry polyacrylonitrile short fiber. The invention discloses the needle punched cloth for extracting uranium from seawater based on the dry PAN fiber for the first time, the material has the advantages of low production cost, batch production and large-scale implementation, can be directly soaked in seawater, can be rolled into components such as a filter element and the like, and can be used for enriching and separating uranium from seawater in forms of single-layer filtration, multi-stage filtration and the like; the industrial popularization and application are easy.

The invention provides a preparation method of high-performance polyacrylonitrile pre-oxidized fibers, and belongs to the technical field of preparation of carbon filaments from polyacrylonitrile. The preparation method comprises the following steps: adding hydroxylated carbon nanotubes into deionized water, performing ultrasonic dispersion, adding a modifier and a catalyst, continuing ultrasonic dispersion, heating to 80-90 DEG C, performing constant-temperature reaction, fully washing with water, and drying to obtain modified carbon nanotubes; dispersing the modified carbon nanotube in an N, N '-dimethylformamide solution, adding an acrylonitrile monomer, hydroxyethyl acrylate and an initiator, copolymerizing to form a carbon nanotube / acrylonitrile copolymer, and spinning to obtain a carbon nanotube / acrylonitrile copolymer fiber; the carbon nano tube / acrylonitrile copolymer fiber is placed in a microwave treatment device, and a plurality of microwave generators are arranged in the microwave treatment device and are used for carrying out segmented pre-oxidation on the carbon nano tube / acrylonitrile copolymer fiber. The problems that an existing polyacrylonitrile fiber pre-oxidation technology is high in energy consumption and low in strength, poor in flame retardance and the like due to the difference between internal and external pre-oxidation effects can be solved.

The invention discloses a thermally stable gas diffusion layer material and a fuel cell, and relates to the field of fuel cells. When the heat-stable gas diffusion layer material is prepared, short-cut polyacrylonitrile carbon fibers are subjected to papermaking and then cured, and 3-aminothiophene is oxidized and grafted to prepare a modified carbon paper base layer; the preparation method comprises the following steps: carrying out a reaction on a single-layer graphene oxide nanosheet, 6-amino-2-mercaptobenzothiazole and 3-aminoethyl thiophene to prepare a modified single-layer graphene oxide nanosheet; the preparation method comprises the following steps: reacting polyvinylidene fluoride powder, 3-allyl thiophene and single-ended vinyl silicone oil to prepare a modified polyvinylidene fluoride emulsion; and uniformly mixing the modified single-layer graphene oxide nanosheet, a modified polyvinylidene fluoride emulsion and isopropanol, spraying on the modified carbon paper base layer, and reacting with 3, 4-ethylenedioxythiophene to prepare the thermally stable gas diffusion layer material. The thermally stable gas diffusion layer material prepared by the method has excellent porosity, thermal stability, conductivity and corrosion resistance.

Recycling wind turbine blades includes shredding, crushing, and milling the wind turbine blades to yield a multiplicity of particles including glass fiber and sieving the particles to yield a multiplicity of pellets including glass fibers. Manufacturing a composite coaxial fiber includes providing a first, second, and third polymer composition to yield a composite coaxial fiber precursor, processing the composite coaxial fiber precursor to yield a coagulated composite coaxial fiber precursor, drawing the coagulated composite coaxial fiber precursor, and heating the drawn coagulated composite coaxial fiber precursor to yield the composite coaxial fiber. The second polymer composition can include the recycled glass fibers. The resulting composite coaxial fiber includes an inner and outer layer including polyacrylonitrile and a middle layer between the inner layer and the outer layer. The middle layer includes polyacrylonitrile and a multiplicity of the recycled glass fibers.

The invention belongs to the field of intelligent wearing, and discloses a multifunctional wearable composite fiber membrane and a preparation method and application thereof. The multifunctional wearable composite fiber membrane is of a sandwich structure, the upper layer is a fullerene hybridized phosphorene modified polyacrylonitrile membrane, the lower layer is a polyurethane membrane, and the middle layer is a silver nanowire layer. The preparation method comprises the following steps: firstly, preparing fullerene hybridized phosphorene nanosheets, dispersing the fullerene hybridized phosphorene nanosheets into a solvent to obtain fullerene hybridized phosphorene dispersion liquid, adding the fullerene hybridized phosphorene dispersion liquid into a polyacrylonitrile solution, stirring to obtain a fullerene hybridized phosphorene / polyacrylonitrile spinning solution, and carrying out electrostatic spinning to obtain the fullerene hybridized phosphorene modified polyacrylonitrile fiber membrane. And then rolling or spraying a silver nanowire layer, covering one side of the silver nanowire layer with a polyurethane fiber membrane, drying and pressing to obtain the composite material. The composite fiber membrane prepared by the invention has good mechanical properties, air permeability, one-way moisture conduction performance, antibacterial performance, heat dissipation performance, electromagnetic shielding performance and flame retardant performance, and has a wide application prospect in the field of flexible wearable intelligent equipment.

The invention relates to a dry-jet wet-spinning ultra-high-performance polyacrylonitrile-based carbon fiber and a preparation method thereof, and belongs to the technical field of carbon fibers. A preparation method of dry-jet wet-spinning ultra-high-performance polyacrylonitrile-based carbon fiber comprises the following steps: S1, mixing acrylonitrile, a comonomer, a chain transfer agent, an initiator and a solvent, carrying out polymerization reaction through a solvent dropwise addition method, and preparing a spinning solution; wherein the comonomers comprise a first comonomer, a second comonomer and a third comonomer; s2, the spinning solution is subjected to solidification, water washing, water drawing, oiling, drying and steam drawing, and precursor fibers are obtained; s3, the precursor fiber is sequentially subjected to pre-oxidation, low-temperature carbonization, high-temperature carbonization, graphitization, surface treatment, sizing and drying, and the ultra-high-performance polyacrylonitrile-based carbon fiber is prepared. Wherein the pre-oxidation adopts four-stage pre-oxidation treatment. The strength and modulus of the carbon fiber can be effectively and synergistically optimized, and the carbon fiber with high strength and high modulus is prepared.

The application belongs to the technical field of membrane separation materials, and discloses an ultrahydrophilic oil-water separation membrane, a preparation method and application thereof, and comprises the following steps: 2-(2-bromoisobutyryloxy)ethyl methacrylate monomers are prepared from 2-hydroxyethyl methacrylate and 2-bromoisobutyryl bromide, and a polymer with an atom transfer radical polymerization initiator is prepared through a free radical polymerization reaction; the polymer with the atom transfer radical polymerization initiator and polyacrylonitrile are dissolved into a solvent, and a PAN / P(AN-g-BIEM) blended membrane is prepared through a non-solvent induced phase separation method; and a hydrophilic polymer brush is grafted to the surface of the PAN / P(AN-g-BIEM) blended membrane to obtain the ultrahydrophilic oil-water separation membrane; the ultrahydrophilic oil-water separation membrane prepared by the application has a high separation flux, excellent oil-water separation efficiency and separation performance for different oil-in-water emulsions.

The invention relates to a preparation method of a hydrophobic manganese-based low-temperature denitration catalyst. According to the catalyst, a composite oxide of CeO2 and MnO2 is used as an active component, and polyacrylonitrile submicron fibers are used as a carrier; a mixed solution of carbon tetrachloride and gamma-aminopropyltriethoxysilane is used as a hydrothermal solution substrate, a mixed solution of ethyl acetate and gamma-aminopropyltriethoxysilane is used as a hydrothermal solution supernatant, and a hydrothermal-electrostatic spinning method is adopted for preparation; on the basis of the mass of the polyacrylonitrile submicron fiber carrier, the mass percentage of the active component is 10-20%, and the mass ratio of CeO2 to MnO2 in the active component is 1: (1-2). The catalyst not only can be used for catalytically reducing NO into N2 at low temperature, but also can be used for filtering particles in flue gas, has excellent water and sulfur poisoning resistance, and has relatively high economic value and wide market application prospect.

The present invention relates to a PAN fiber-based gold absorption material, a method of manufacturing the same, and a method of recovering gold using the same, which may implement an excellent gold absorbent property, excellent durability, excellent manufacturability, and excellent usability through a structure in which an alkylamine compound is immobilized on a polyacrylonitrile (PAN) fiber. The PAN fiber-based gold absorption material according to the present invention is provided to adsorb gold ions in water, which is configured to have a structure in which the alkylamine compound is immobilized on a PAN fiber surface.

Described herein is a porous article comprising: a nonwoven composite comprising oxidized polyacrylonitrile staple fibers and silica aerogel; wherein a coating is disposed on at least a portion of a surface of the nonwoven composite, wherein the coating is derived from an aminoalkoxy silane and wherein the porous article has a surface area of at least 1 m2 / g. Such porous articles may be used to sorb components of interest such as carbon dioxide.

The invention relates to the field of lithium ion batteries, and particularly discloses an ultrathin high-heat-resistance and high-electrolyte-infiltration fiber-coated diaphragm and a preparation method of the ultrathin high-heat-resistance and high-electrolyte-infiltration fiber-coated diaphragm. An ultrathin fiber-coated diaphragm with high heat resistance and high electrolyte infiltration comprises a base membrane and a coating located on one side or two sides of the base membrane, the coating is formed by curing slurry, and the slurry comprises the following raw materials in parts by weight: 5-30 parts of a binder, 10-100 parts of an inorganic ceramic material, 1-100 parts of nanofibers, 0.1-5 parts of an auxiliary agent, 100-300 parts of a solvent and 0.1-5 parts of a dispersant; the glass transition temperature of the binder is higher than 150 DEG C; the binder is selected from at least one of a modified polyacrylic acid binder, a modified acrylamide binder, a modified polyacrylonitrile binder, a modified styrene butadiene rubber binder and a modified polyvinyl alcohol binder. The fiber-coated diaphragm provided by the invention has high heat resistance and high electrolyte wettability.

The invention relates to the technical field of concrete, and particularly discloses geopolymer concrete and a preparation method thereof. The geopolymer concrete is prepared from the following raw materials in parts by weight: 60 to 80 parts of mineral powder, 30 to 40 parts of fly ash, 20 to 25 parts of silica fume, 45 to 55 parts of alkali activator, 150 to 180 parts of aggregate, 1.95 to 2.25 parts of toughening fiber and 40 to 50 parts of water, the toughening fiber is composite toughening agent modified polyvinyl alcohol / polyacrylonitrile composite fiber, and the length of the toughening fiber is 6 to 10 mm; in addition, the preparation method disclosed by the invention has the advantage of improving the brittleness of the geopolymer concrete.

The invention relates to a platinum-zinc alloy supported nitrogen-doped porous multi-layer carbon material and preparation and application thereof, the carbon material takes a rod-like graded porous carbon nanomaterial as a carrier, and platinum-zinc alloy particles and zinc monatomic are jointly supported on the surface of the carrier; the preparation method comprises the following steps: S1, adding zinc acetate and hexadecyl trimethyl ammonium bromide into DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding into a polyacrylonitrile solution, and stirring; s2, performing electrostatic spinning on the obtained spinning precursor solution; s3, adding the obtained nanofiber into a zinc acetate dihydrate solution, then adding a dimethylimidazole solution, carrying out hydrothermal reaction, soaking the obtained product in a chloroplatinic acid methanol solution, and then carrying out freeze drying; and S4, heating carbonization is carried out under the protection of an inert atmosphere, then annealing and cooling are carried out, and the PtZn-Zn-N4-HPCNFs material is obtained. Compared with the prior art, the catalytic performance and the like in the reaction processes of oxygen reduction reaction (ORR), chlorine evolution reaction (CER) and the like can be effectively improved.

The invention relates to the technical field of capacitors, and discloses a high-energy-density capacitor which is characterized in that a positive electrode is composed of a composite active material, a conductive agent and a binder, the composite active material comprises a mixture of nitrogen-sulfur co-doped carbon foam magnetic microspheres and iron sesquioxide nanodot at nitrogen-doped graphene, and the conductive agent is a mixture of nitrogen-sulfur co-doped carbon foam magnetic microspheres and iron sesquioxide nanodot at nitrogen-doped graphene. The preparation method of the nitrogen-sulfur co-doped carbon foam magnetic microspheres comprises the following steps: by taking polyacrylonitrile as a carbon source, thiourea as a sulfur source and ferric nitrate as an iron source, carrying out hydrothermal reaction and then carrying out carbonization treatment at 800-1000 DEG C for 2-4 hours; the energy density of the high-energy-density capacitor can reach 700-800 Wh / kg, the power density is larger than or equal to 10 kW / kg, compared with a traditional super capacitor, the high-energy-density capacitor has the advantages that the energy density is remarkably improved, and the application requirements of the fields with high requirements for energy and power such as electric automobiles and intelligent power grids can be met.

A boron-doped graphene composite solid-state electrolyte and its preparation and application. A mixed solution of polyacrylonitrile (PAN) and N,N-dimethylformamide is prepared into a PAN porous film using electrospinning technology. A PEO casting solution is prepared by mixing boron-doped graphene, polyethylene oxide, lithium bis(trifluoromethanesulfonylimide), and acetonitrile. This solution is then cast onto the PAN porous film and, after vacuum drying, forms a composite solid-state electrolyte with polyacrylonitrile fibers as a support, polyethylene oxide as a matrix, and boron-doped graphene as a filler. The composite solid-state electrolyte prepared by the present invention has high ionic conductivity and lithium ion transference number, providing lithium batteries with good rate performance and cycle stability.

The invention relates to the technical field of polycarbonate ASA materials, and discloses an ASA composite material, a preparation method and application of the ASA composite material in an electric vehicle charging pile shell. Polycarbonate, ASA acrylonitrile-styrene-acrylate copolymer, poly (acrylonitrile-acrylate benzyl carbonate), an antioxidant and a processing aid are mixed and subjected to melt extrusion; the ASA composite material is obtained. Poly (acrylonitrile-acrylate benzyl carbonate) contains a carbonate group which is the same as that of polycarbonate, the polycarbonate and the poly (acrylonitrile-acrylate benzyl carbonate) have good compatibility, and contain polyacrylonitrile and polyacrylate block molecular chains, and the side chain contains a benzene ring structure which is similar to the structure of an ASA acrylonitrile-styrene-acrylate copolymer, so that the effect of compatibilizing the polycarbonate and the ASA is achieved; therefore, the material has higher impact strength, tensile strength and elongation at break.

The invention relates to a composite nanofiber membrane and a preparation method and application thereof, and belongs to the technical field of wearable electromagnetic shielding materials. The preparation method comprises the following steps: dissolving polyacrylonitrile in a solvent, and spinning to obtain a polyacrylonitrile nanofiber membrane; then, the polyacrylonitrile nanofiber membrane is soaked in a trihydroxymethyl aminomethane hydrochloride solution containing dopamine; soaking the dopamine-coated fiber membrane in a mixed solution containing a copper salt or a silver salt, and then soaking the dopamine-coated fiber membrane in a reaction solution to obtain a modified nanofiber membrane; then spraying a dispersion liquid containing a conductive filler onto the modified nanofiber membrane to obtain a conductive filler modified nanofiber membrane; and finally, dissolving polyurethane into a solvent, and spinning by taking the conductive filler modified nanofiber membrane as a receiver to obtain the composite nanofiber membrane. The composite nanofiber membrane has excellent electromagnetic shielding performance, directional perspiration ability, air permeability, photothermal conversion ability, antibacterial property, mechanical strength and flexibility.

The application relates to a method for determining pre-oxidation process parameters of polyacrylonitrile-based carbon fibers, and belongs to the technical field of carbon fibers. The method for determining pre-oxidation process parameters of polyacrylonitrile-based carbon fibers comprises first-stage pre-oxidation, the first-stage pre-oxidation temperature is determined based on DSC of the original fiber, and the first-stage pre-oxidation time is determined based on a cyclization index of the fiber at the first-stage pre-oxidation temperature. More reasonable pre-oxidation parameters can be determined, and polyacrylonitrile-based carbon fibers with high strength and high modulus can be prepared.

The present invention discloses a triaxially spun superelastic and high-temperature resistant composite carbon nanofiber aerogel and a preparation method thereof. The aerogel is formed by interweaving curly fibers with a core layer of carbon and a shell layer of oxide ceramic. The present invention utilizes electrostatic spinning technology to prepare composite carbon nanofiber aerogels. First, an inner layer polyacrylonitrile solution is prepared, and the water / alcohol ratio is adjusted to prepare a middle layer ceramic sol with controllable water content, thereby obtaining a spinning solution with compatibility in the initial spinning stage. The temperature and humidity of the airflow of the outer nozzle are then regulated, and the water content of the ceramic sol is further adjusted during the spinning process, so that the spinning solution becomes incompatible. The spinning solution jet is fast and solidified in advance, thereby obtaining a curly interwoven structure nanofiber aerogel precursor. Finally, the final product is obtained by changing the atmosphere and performing rapid and continuous heat treatment. The present invention solves the problems of insufficient mechanical properties and easy oxidation of carbon nanofiber aerogels. The preparation method is simple and easy to implement, and the process is continuous, and can be carried out on existing electrostatic spinning production equipment.

The invention belongs to the technical field of polymer composite materials, and relates to a multilayer solar interface evaporator and a preparation method thereof. The evaporator comprises a photo-thermal layer, a connecting layer and a supporting layer, the photo-thermal layer combines biomass material-carbonized loofah powder with high polymer material polyacrylonitrile, a photo-thermal film with photo-thermal conversion capacity is prepared through the electrostatic spinning technology, and polyaniline grows on the surface of the photo-thermal film in situ so as to improve the photo-thermal efficiency; the connecting layer adopts a loofah sponge fiber skeleton, so that the layers are tightly combined; the supporting layer selects polyamide 6 as a foaming material and bamboo charcoal powder as a functional filler, and the polyamide 6-bamboo charcoal powder foam supporting layer is prepared by utilizing a solution foaming technology and has the functions of heat insulation, water delivery and dye adsorption. The photo-thermal layer and the supporting layer are integrated through the connecting layer to prepare the multi-layer solar interface evaporator, efficient photo-thermal evaporation, high dye adsorption rate and long cycle life are achieved, and the multi-layer solar interface evaporator has the advantages of being environmentally friendly, low in cost and stable in performance and has application prospects in the fields of seawater desalination and industrial wastewater treatment.

The present invention discloses a conductive slurry for lithium-ion battery positive electrodes. The slurry comprises the following substances: 1-2 parts graphene, 4-5 parts modified polymer, and 90-100 parts N-methylpyrrolidone, by weight. The modified polymer is prepared by mixing modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methacrylic acid sulfonate, and deionized water, stirring at room temperature for 30-40 minutes, then introducing nitrogen to deoxygenate for 1-2 hours, then adding ammonium persulfate, and heating the mixture to 60-70°C under a protective atmosphere for 3-4 hours. The mixture is then heated to 90-100°C and allowed to react for 3-4 hours. After the reaction is complete, the mixture is filtered, washed, and dried to obtain the modified polymer. Advantages: The present invention chemically modifies the surface of carbon nanotubes, allowing them to participate in the synthesis of the modified polymer (polyacrylonitrile binder), resulting in the slurry having good electrical conductivity and stability in battery applications.

The invention relates to the technical field of fireproof plates, in particular to a basalt fiber fireproof plate based on a carbon-based protective layer and a preparation method of the basalt fiber fireproof plate, and the basalt fiber fireproof plate comprises the following raw materials in parts by weight: 90-100 parts of epoxy resin, 20-30 parts of a curing agent, 15-25 parts of modified basalt fibers, 10-20 parts of filler, 40-60 parts of a flame retardant, 1-2 parts of a coupling agent and 0.5-1 part of a defoaming agent. According to the preparation method, the basalt fiber is prepared through multi-step reaction of pretreatment, impregnation, pre-oxidation and carbonization, the basalt fiber is impregnated in treatment liquid with polyacrylonitrile as a precursor, polymer molecules are effectively attached, and the interface debonding phenomenon at high temperature is effectively inhibited through subsequent pre-oxidation and carbonization treatment under specific atmosphere and temperature programming; the excellent mechanical property stability of the material is kept in a long-term high-temperature environment.

The present invention discloses a method for regulating spinel-type high-entropy oxides using electrospinning. The method is characterized in that metal sources, polyacrylonitrile, and dimethylformamide of varying concentrations are fully mixed to form a precursor solution, followed by preparing a spinel-type high-entropy oxide having a nanofiber structure by electrospinning. Results show that, compared to conventional methods for preparing high-entropy oxides, electrospinning facilitates a lower phase transition temperature and promotes the formation of nanoscale high-entropy oxides. Furthermore, the fibers formed are significantly affected by the precursor solution. By varying the amount of total metal added, the final fiber state of the catalyst can be effectively regulated, exhibiting significant differences in ethyl acetate catalytic oxidation activity. The preparation process is simple, enhancing the application value of high-entropy oxides in the field of heterogeneous catalysis.

The invention provides a flexible carbon nanofiber membrane as well as a preparation method and application thereof. The flexible carbon nanofiber membrane comprises a carbon nanofiber matrix and a modified material loaded in the carbon nanofiber matrix, the carbon nanofiber matrix comprises polyacrylonitrile, and the modified material comprises at least one of fluorine and zirconium oxide. The fluorine and / or zirconium oxide modified material is introduced, so that the performance is remarkably improved on the basis of a carbon nanofiber matrix, and the key defects of the existing carbon nanofiber membrane are effectively overcome. The invention also provides a preparation method and application of the flexible carbon nanofiber membrane.

The invention discloses a three-dimensional porous carbon encapsulated V2O5 carbon fiber electrode constructed by in-situ growth and a preparation method and application thereof, belongs to the technical field of aluminum ion battery positive electrode materials, and aims to solve the problems that the intercalation and deintercalation dynamics of AlCl4 in a polyacrylonitrile (Pan)-based carbon fiber is blocked due to disordered graphite structure, and the performance of the Pan-based carbon fiber is influenced. And the material cannot be used as an effective electrode material to be applied to an aluminum ion battery system. According to the preparation method, an in-situ growth technology is adopted, a three-dimensional porous carbon substrate is grown on the surface of carbon fiber, then an orthorhombic system vanadium pentoxide (V2O5) nano material which has high theoretical specific capacity and can realize large-current charging and discharging is packaged in the three-dimensional porous carbon substrate, and the V2O5-based carbon fiber electrode is prepared. According to the electrode, the electrostatic interaction between Al < 3 + > ions and crystal lattices is effectively relieved, the structural advantages of the carbon fibers and the energy storage performance of V2O5 are fully combined, the energy storage effect of the aluminum ion battery is remarkably improved, and a new effective scheme is provided for development of aluminum ion battery electrode materials.

The invention provides a solid electrolyte and a battery. The solid electrolyte comprises polythionocarbamate, polyacrylonitrile and a lithium salt, wherein the polythionocarbamate comprises a thiocarbamate structural unit. In the solid electrolyte provided by the invention, amino groups in a thiocarbamate structural unit in the polythionocarbamate and cyano groups in polyacrylonitrile form hydrogen bonds, so that the polythionocarbamate and the cyano groups in the polyacrylonitrile have good compatibility, the crystallinity of the polyacrylonitrile can be effectively reduced by blending the polythionocarbamate and the polyacrylonitrile, and the flexibility of the solid electrolyte is improved; and meanwhile, the solid electrolyte has relatively good mechanical properties. Particularly, sulfur atoms in a thiocarbamate structural unit in the polythionocarbamate contribute to promoting lithium ion transmission and improving the ionic conductivity, and due to the interaction of hydrogen bonds formed by the polythionocarbamate and polyacrylonitrile, the transmission rate of lithium ions can be further improved.