117 results about "Polymer dissolution" patented technology

The invention discloses a high-voltage output elastic self-crimping spiral fiber and a preparation method and application thereof, and belongs to the technical field of fiber preparation. The preparation method comprises the following steps: dissolving a thermoplastic piezoelectric polymer in a first solvent dissolved with metal salt to prepare a first spinning solution; a high-elasticity polymer is dissolved in a second solvent to prepare a second spinning solution, the second solvent is different from the first solvent, and the high-elasticity polymer is incompatible with the thermoplastic piezoelectric polymer; taking the first spinning solution as a shell layer solution and the second spinning solution as a core layer solution, and carrying out electrostatic spinning by adopting a two-component core-shell electrostatic spinning process. The preparation method is simple, and the prepared fiber has excellent mechanical property and enhanced piezoelectric effect and can be applied to flexible electronic devices and intelligent wearable equipment.

The application belongs to the technical field of porous adsorption membrane materials, and discloses a titanium lithium ion porous adsorption membrane material and a self-assembly preparation method and application thereof. The preparation method comprises the following steps: dissolving a film-forming polymer in a dispersion liquid containing MXene nanosheets to form a uniform precursor liquid; the MXene nanosheet is a carbide, nitride or carbonitride of a transition metal with a single-layer structure; dispersing a titanium lithium composite oxide in the precursor liquid to form a casting solution; coating the casting solution on a support, and then performing phase inversion by using pure water to obtain a matrix film; placing the matrix film in a lithium elution liquid for immersion washing, replacing lithium ions in the matrix film, and causing a self-assembly reaction of the titanium lithium composite oxide in the matrix film, so that the titanium lithium ion porous adsorption membrane material is obtained. The application innovatively introduces MXene nanosheets and a polysulfone matrix film, fixes the MXene nanosheets on the polysulfone matrix film as an in-situ growth substrate of the titanium lithium composite oxide, and the obtained membrane material has a high adsorption capacity.

The invention discloses a mixed matrix membrane based on defect MOF and a preparation method and application thereof, and the method comprises the following steps: (1) dissolving a hydroxyl-containing monodentate carboxyl organic ligand and 2-aminoterephthalic acid in a solvent A, stirring at room temperature, and carrying out ultrasonic treatment to obtain a mixed solution; then dropwise adding tetraisopropyl titanate into the mixed solution, and carrying out heating reaction in a reaction kettle; after the reaction is finished and cooling is carried out, a solid product is collected through centrifugation, washed and dried, and DN-MIL-125 is obtained; (2) dispersing DN-MIL-125 in a solvent B to obtain a DN-MIL-125 suspension, dissolving an intrinsic microporous polymer cPIM-1 in a solvent C to obtain a cPIM-1 solution, and then uniformly mixing the cPIM-1 solution with the DN-MIL-125 suspension to obtain a membrane casting solution; and carrying out defoaming treatment on the membrane casting solution, and forming a membrane by adopting a solution casting method to obtain the mixed matrix membrane DN-MIL-125 / cPIM-1. According to the method, the defective metal organic framework material DN-MIL-125 is added into the cPIM-1 intrinsic microporous polymer to prepare the mixed matrix membrane, and the separation performance of CO2 / N2 gas can be remarkably improved.

The invention discloses a preparation method of polymer drug-loaded nanoparticles. According to the method, on the basis of an emulsification method, the controllable continuous preparation of the polymer drug-loaded nanoparticles is realized by utilizing an ultrasonic micro-fluidic technology. The method specifically comprises the following steps: dissolving a drug and a polymer in a water-insoluble organic solvent to serve as an organic phase, taking a surfactant aqueous solution as a water phase, introducing the two phases into ultrasonic microfluidic equipment at a certain flow velocity ratio, and emulsifying under the ultrasonic action to obtain uniform liquid drops; and removing the organic solvent by methods of stirring, rotary evaporation, vacuum centrifugation, ultrafiltration and the like to obtain the cured polymer drug-loaded nanoparticles. The nanoparticles prepared by the method are uniform in particle size and high in drug encapsulation efficiency, and can be continuously produced.

The invention relates to the technical field of oil and gas field development engineering and intelligent control, in particular to a polymer dry powder direct distribution fracturing fluid remote data transmission control system which comprises an environmental parameter acquisition center used for acquiring the conductivity, the fluid temperature, the fluid pH value, the mineralization degree and the dry powder polymer nominal molecular weight of a fracturing operation site. The data is sent to the dynamic reference construction unit; the dynamic reference construction unit is used for obtaining theoretical equilibrium viscosity and a characteristic swelling time constant, and constructing a theoretical reference evolution equation by utilizing the theoretical equilibrium viscosity and the characteristic swelling time constant; the space-time mapping sensing unit collects main path mixed flow to obtain an actually measured dissolution rate signal; the active factor identification unit is used for calculating a polymer dissolution active factor; the cascade feedback control unit generates predicted final value viscosity and a screw feeder frequency conversion control signal, and constructs a semantic feature transmission vector; accurate feedforward control over the performance of the fracturing fluid is achieved, and the hysteresis problem of traditional control is solved.

A method for purifying a regenerated polymer into a higher-purity polymer is disclosed. In embodiments of the present invention, the method comprises obtaining a regenerated polymer, leaching various contaminants using a leaching solvent to produce an leached polymer, and then dissolving the leached polymer in a solvent to produce a first solution containing the dissolved polymer. The first solution is precipitated, filtered, and extracted. A higher-purity polymer is separated from the obtained solution.

The present invention provides organic particles with high solvent resistance, which are made from a polymer having a main skeleton of cis-1,4-polyisoprene, a typical example of which is natural rubber. [Solution] A method for producing organic particles includes the steps of dissolving a polymer having cis-1,4-polyisoprene as a main skeleton in a solvent and carrying out a cyclization reaction to obtain a cyclized rubber having a cyclization rate of 60 to 90%, and suspension polymerizing the cyclized rubber and a vinyl monomer in the presence of water and a suspension stabilizer, wherein the polymer having cis-1,4-polyisoprene as a main skeleton has a Mooney viscosity [ML(1+4)100°C] specified in JIS K 6300 of 18 to 65, and the vinyl monomer contains a monofunctional vinyl monomer having only one vinyl group and a crosslinkable vinyl monomer having multiple vinyl groups.

The invention relates to the technical field of polymer dissolution, in particular to a polymer dissolution packed bed, a polymer dissolution system and a polymer dissolution method. The packing ring can rotate while revolving, and the contact opportunity and the contact time of the packing ring and a solution can be increased and prolonged by utilizing the rotation of the packing ring, so that the efficiency of a chemical reaction or physical separation process is improved, and a polymer is quickly dissolved. Meanwhile, the design of rotation and revolution of the packing ring is beneficial to more uniformly mixing treated substances, reducing mass transfer or heat transfer resistance and improving the uniformity of the whole process. The revolution mechanism and the rotation mechanism jointly form a multi-shaft type rotation transmission mechanism, revolution is achieved through driving of a single revolution motor, and meanwhile rotation of each packing ring is achieved through the revolution process of each first gear and the meshing relation between each first gear and a static second gear. According to the multi-shaft type rotation transmission mechanism, the kinetic energy of the motor can be more effectively utilized, and the energy consumption of equipment is reduced.

The invention discloses a preparation method and application of an in-situ copolymerized PIM-pillararene composite membrane, a tetrahydroxy-containing compound and a tetrafluoro-containing compound are used as reaction monomers, a precursor matrix is synthesized by adjusting the proportion of the tetrafluoro-containing compound, and then a mixed matrix polymer is obtained by in-situ doping of polyhydroxy pillararene. Dissolving a polymer in an organic solvent to obtain a membrane casting solution; and coating a solvent-resistant substrate with the membrane casting solution, and drying in a drying oven to obtain the composite membrane with high separation performance. Fluorine groups in a PIM matrix and hydroxyl groups on cyclic polyhydroxy aromatic hydrocarbon molecules are subjected to chemical cross-linking reaction to enhance the porosity of the polymer and increase the specific surface area, and column aromatic rings are introduced to promote adsorption of guest molecules, so that rich high-performance transmission channels are formed. On the basis of PIM synthesis, a polyhydroxy pillar arene compound is further introduced, the membrane stability can be improved through a rich net structure, and the separation performance of common organic solvents is remarkably improved.

The application discloses a flexible carbon nanometer net film material and a preparation method thereof, and belongs to the technical field of nanometer fiber electrode materials. The preparation of the flexible carbon nanometer net film material comprises the following steps: dissolving a polymer in a solvent A to obtain a solution B; ultrasonically dispersing the solution B in a solvent C to obtain a spraying net emulsion; wherein the solution B and the solvent C are immiscible; performing electrostatic spraying on the spraying net emulsion to obtain a polymer nanometer net film; performing pre-oxidation on the polymer nanometer net film; applying longitudinal and transverse tension to the polymer nanometer net film under a protective atmosphere; calcining the polymer nanometer net film; and cooling the polymer nanometer net film to obtain the flexible carbon nanometer net film material. The flexible carbon nanometer net film material has an efficient conductive network, exhibits excellent conductive performance and flexibility, and has a wide application in the fields of wearable devices, flexible sensors, energy storage devices and biomedical devices.

A method for inhibiting the formation of scale in a subterranean geological includes injecting a scale-inhibiting composition into a subterranean geological formation comprising a target zone. The scale inhibiting composition includes water and an amphiphilic polymer selected from the group consisting of S1, S2, and combinations thereof, where the structure of S1 is:the structure of S2 is:where x is in a range from 4 to 20, and n is in a range from 3 to 15, and where the amphiphilic polymer is dissolved in the scale inhibiting composition in an amount such that the concentration of the amphiphilic polymer at the target zone is equal to or greater than 500 ppm.

The invention belongs to the field of composite membranes, and particularly relates to a waterproof breathable membrane based on a micropore-nanofiber composite structure and a preparation method of the waterproof breathable membrane. Comprising the following steps: preparing an ePTFE microporous membrane by adopting a thermally induced phase separation method or a two-way stretching method, and carrying out corona treatment on the ePTFE microporous membrane; dissolving a fiber-forming polymer in an organic solvent to form a uniform spinning solution; the ePTFE microporous membrane obtained after corona treatment is fixed to a receiving roller; carrying out electrostatic spinning by adopting a multi-jet nozzle to obtain a nanofiber / base membrane composite blank; meanwhile, an N, N-dimethylformamide steam treatment cabin is arranged behind the receiving roller, then continuous interface fusion and reinforcement treatment is immediately carried out on the just deposited nanofiber / base membrane composite blank through a hot pressing roller, and the composite membrane is obtained; and drying and rolling the composite film to obtain the waterproof breathable film with the micropore-nanofiber composite structure. The breathable film provided by the invention realizes extremely high hydrostatic pressure and excellent water vapor permeability, and also has good mechanical strength and durability.

The invention belongs to the technical field of oil and gas field development and research, and relates to a method and system for predicting the solubility of a non-Newtonian polymer in a forced stretching device and a readable medium, and the method comprises the following steps: obtaining the viscosity of a target polymer after natural dissolution, and fitting an intrinsic equation according to the viscosity; based on the intrinsic equation and the swelling behavior of the polymer particles, establishing a swelling double-fluid model, and inputting the mass transfer rate of the non-Newtonian polymer into the swelling double-fluid model to generate a liquid phase volume fraction and a solid phase volume fraction; inputting the volume fractions of the liquid phase and the solid phase into a component transport equation to generate the mass fractions of all components in the solid phase so as to obtain the solid density; inputting the liquid-phase and solid-phase volume fractions into the group equilibrium model to generate the average particle size of solid-phase particles; coupling output results in the swelling double-fluid model, the component transport equation and the group balance model to obtain the dissolving property of the non-Newtonian polymer. The method can more accurately predict the behavior characteristics of particles in non-Newtonian complex fluid so as to realize the process optimization of polymer rapid dissolution configuration.

The invention relates to a gas separation polymer composite membrane with high pressure resistance as well as a preparation method and application thereof. The method comprises the following steps: dissolving a crystalline polymer in a good solvent, uniformly coating the polymer solution on the surface of a flat substrate, immersing the flat substrate in an ionic liquid with weak interaction with the polymer, and carrying out solvent exchange treatment at a constant temperature. The polymer / ionic liquid composite membrane prepared by the method is used for gas separation. According to the gas separation polymer composite membrane, the high ionic liquid content is maintained, and meanwhile the high mechanical performance of the composite membrane is maintained. The ionic liquid can stably exist in a polymer matrix to improve the continuity of a gas transmission path, and meanwhile, the ionic liquid which weakly interacts with a macromolecular chain can effectively promote a polymer molecular chain to form a microcrystalline structure in the exchange process, so that the mechanical property of the composite membrane in the gas separation process is greatly improved, and the gas separation efficiency is improved. And during gas separation, high pressure resistance, high permeability and high selectivity are shown. The method is simple in process, convenient to operate and mild in condition.

The present application relates to the technical field of fiber surface treatment, in particular to a sizing agent based on a multiple bonding synergistic enhancement mechanism and a preparation method and application thereof, comprising the following steps: dissolving a polymer containing active hydrogen functional groups in a solvent A under a protective atmosphere, stirring and dissolving to obtain a polymer solution; dropping a compound containing covalent crosslinking active sites into the polymer solution, continuously reacting to obtain a homogeneous modified solution; purifying the homogeneous modified solution to obtain a purified product; dissolving the purified product in a solvent B to obtain the sizing agent. The present application solves the technical problems of low physical adsorption bonding strength and poor fatigue resistance caused by the rigidity of a single chemical bonding interface in the existing aramid fiber surface modification technology.

The present application relates to the technical field of zinc metal battery, in particular to a multifunctional composite gel electrolyte, its preparation method and application. The present application provides a composite gel electrolyte, which comprises a polymer gel matrix, a zinc salt and a ZnHA filler; wherein the ZnHA filler is a hydroxyapatite material doped with zinc ions. The electrolyte is prepared by polymer dissolution, zinc salt addition, ZnHA dispersion, three-dimensional printing forming, low-temperature gelation and zinc salt solution activation, and has good shear thinning characteristics, self-supporting property and printability. Further, a three-dimensional printed interdigital structure electrode is constructed, and the electrolyte is covered to form an ion transmission channel, and a flexible zinc metal battery is assembled; multiple monomers can be connected in series to increase the output voltage. The flexible battery has excellent ion transmission, cycle stability, flexibility and safety, and can be used in the fields of flexible electronics, wearable devices and intelligent sensing.

To provide a vinyl chloride-based polymer that has, when dissolved in a solvent, excellent filterability.SOLUTION: A method for producing a vinyl chloride-based polymer comprises a polymerization step of suspension-polymerizing a monomer mixture comprising vinyl chloride monomer and a monomer copolymerizable with vinyl chloride monomer in the presence of an aldehyde, wherein the added amount of the aldehyde is 0.1 wt.% to 4.0 wt.% relative to the weight of the monomer mixture, the whole charged amount of the monomer copolymerizable with vinyl chloride monomer relative to the whole charged amount of vinyl chloride monomer and the monomer copolymerizable with vinyl chloride monomer is 16.0 wt.% to 22.0 wt.%, and the amount of initial charge of vinyl chloride monomer relative to the whole charged amount of vinyl chloride monomer is 28.0 wt.% to 38.0 wt.%.SELECTED DRAWING: None

The present application provides a positive electrode plate and a preparation method thereof, an energy storage device and an electrical equipment. The positive electrode plate provided in the present application includes: a current collector and an active material layer, the active material layer is arranged on the surface of the current collector, the active material layer includes active material particles and a polymer, the polymer is wrapped on the surface of the active material particles, and the polymer is hydrophobic; when the positive electrode plate is applied to an energy storage device, the polymer dissolves in the electrolyte of the energy storage device. The positive electrode plate has low requirements for environmental humidity during production, which reduces the manufacturing cost of the energy storage device. When the positive electrode plate is applied to an energy storage device, it does not affect the shuttling of active ions between the positive electrode plates, nor does it reduce the content of active elements in the active material particles, and does not affect the electrochemical performance of the energy storage device.

The present application relates to the technical field of radiative cooling, and discloses a preparation method for an ultra-high reflectivity radiative cooling fiber membrane. In the present application, a polymer is dissolved in an organic solvent to prepare an electrospinning precursor solution, and by adjusting parameters such as the concentration of the electrospinning precursor solution, a spinning voltage, a spinning distance, a drum rotation speed, a spinning liquid supply rate, and a slide rail reciprocation rate, an ultra-high reflectivity radiative cooling fiber membrane having a porous structure is prepared. The reflectivity of the ultra-high reflectivity radiative cooling fiber membrane is greater than 95% in a solar spectral band of 0.3-2.5 um. The ultra-high reflectivity radiative cooling fiber membrane prepared in the present application has a thickness of 300-500 um. The ultra-high reflectivity radiative cooling fiber membrane of the present application can be prepared in batches, has good flexibility, and can be widely applied to the fields of garments, buildings, equipment, etc.

The present invention discloses a surface salt segregation polymer electrolyte and its preparation method and application, which belongs to the field of solid-state and semi-solid-state battery technology. The surface salt segregation polymer electrolyte of the present invention has the characteristic of surface salt enrichment. The preparation method of the salt segregation polymer electrolyte of the present invention comprises the following steps: first, a high molecular skeleton polymer, a solute salt or / and a filler powder are added to a mixed solvent composed of a low boiling point, high polymer solubility solvent and a high boiling point, high salt solubility, low polymer solubility solvent, and all the components are mixed by stirring, homogenizing, or ball milling. The obtained casting solution is cast into a film, or cast, coated or applied on a porous support membrane, and dried to obtain a polymer electrolyte. The polymer electrolyte prepared by the present invention has the characteristic of a salt-enriched surface, can realize efficient ion transport in the electrolyte, generate an interface layer with low impedance and high stability on the surface of the negative electrode, inhibit side reactions, and improve the comprehensive performance of the solid-state battery.

The present invention relates to a process for obtaining a film or a film forming article, the process comprising: a) providing a solvent system comprising molecules with at least one sulfoxide function, the solvent system having a water content of less than or equal to 1000 ppm by weight and having a pH of greater than or equal to 6; b) preparing a polymer solution by dissolving a polymer in the solvent system or by synthesizing a polymer in the solvent system; c) removing the solvent system to obtain a film or a film forming article.

The invention discloses a double-layer composite membrane material as well as a preparation method and application thereof. The method comprises the following steps: dissolving a polymer 1 in a solvent to prepare a membrane casting solution 1, and uniformly covering a support body with the membrane casting solution 1 to prepare a composite membrane 1; and dissolving the polymer 2 or the mixed matrix membrane material in a corresponding solvent to prepare a membrane casting solution 2, uniformly covering the surface of the composite membrane 1 with the membrane casting solution 2, and drying to obtain the double-layer composite membrane material. According to the preparation method provided by the invention, the defects of the membrane layer are remarkably reduced, the separation performance of the double-layer composite membrane is improved, and the permeability and selectivity of the membrane material are effectively balanced. The preparation method is easy and convenient to operate, the membrane performance is excellent, and the industrial application prospect is achieved.

The present invention provides: a novel binder that is capable of suitably contributing to the production of a battery and / or battery characteristics by means of a secondary battery binder which contains an aqueous polymer, wherein the amount of moisture generated at 170-290°C in the aqueous polymer is 15% by mass or less as measured by the measurement method described below, the aqueous polymer is a vinyl polymer that has a repeating unit having an acidic functional group and a nonionic hydrophilic repeating unit, the weight average molecular weight of the aqueous polymer is 1,000,000 or less, and the pH at 25°C of an aqueous solution that is obtained by dissolving the aqueous polymer in water at a concentration of 2% by mass is 6.5 to 8.5 inclusive; and a slurry which contains this binder. [Amount of moisture generated at 170-290°C] 20 g of an aqueous polymer solution which is obtained by dissolving the aqueous polymer in water so as to have a solid content concentration of 2% by mass is added to a tray, and after drying the aqueous polymer solution at 60°C for 8 hours in a forced convection oven, additional drying is performed for 24 hours under conditions of 60°C and a degree of pressure reduction of 0.1 MPa in a vacuum dryer so as to produce a film. The thus-produced film is cut into an approximately 2-mm-square piece weighing 10 mg, and measurement is performed under the conditions described below using a Karl Fischer moisture meter and a moisture vaporizer.　Measurement conditions: After the temperature is raised to 80°C, the temperature is kept at 80°C until the weight loss rate falls to 0.1 µg / s or less (method A). Thereafter, the temperature is raised from 80°C to 300°C over 30 minutes (method B).　Method A data collection interval: 1 second; Method B data collection interval: 5 seconds; Calculation of amount of generated moisture: The ratio of the amount of generated moisture is calculated according to the formula described below, where Wa is the weight after keeping the temperature at 80°C until the weight loss rate falls to 0.1 µg / s or less, and Wb is the amount of generated moisture detected between 170°C and 290°C.　Ratio of amount of generated moisture = Wb / Wa × 100 (% by mass)

The invention relates to a preparation method and application of a conjugated polymer film based on an acid-cleavable side chain. The preparation method comprises the following steps: dissolving a conjugated polymer based on an acid-cleavable side chain in a solvent to prepare a polymer solution; uniformly stirring the polymer solution and the first acid solution to prepare a polymer / acid mixed solution pre-processed by the acid solution; coating a substrate with the polymer / acid mixed solution pre-processed by the acid liquid, and forming a polymer film after the solvent is volatilized; performing first thermal annealing on the polymer film; and applying a second acid solution to the surface of the polymer film after the first thermal annealing, and then carrying out second thermal annealing to obtain the conjugated polymer film without the side chain reprocessed by the acid solution. By utilizing the acid sensitivity characteristic of a side chain, an acid solution is added into a polymer solution before a polymer film is formed to pre-remove part of the side chain so as to synergistically induce ordering of the polymer, so that the film forming quality and the comprehensive performance of the polymer are improved.

A liquid dressing includes a solvent and a film-forming polymer that is dissolved in the solvent and that is made by a process including: providing an alkoxy group-containing silicone resin which is obtained by subjecting an orthosilicate compound and an acidic aqueous solution to a hydrolysis and polymerization reaction; providing an isocyanate group-containing prepolymer which is obtained by reacting a diisocyanate compound with a hydrophilic polyether diol; and subjecting the alkoxy group-containing silicone resin and the isocyanate group-containing prepolymer to a polymerization reaction so as to obtain the film-forming polymer.

This invention provides highly solvent-resistant organic particles using polymers with a cis-1,4-polyisoprene core, such as natural rubber. [Solution] A method for producing organic particles comprising the steps of: dissolving a polymer having cis-1,4-polyisoprene as the main skeleton in a solvent and carrying out a cyclization reaction to obtain a cyclized rubber with a cyclization rate of 60-90%; and suspend polymerization of the cyclized rubber and a vinyl monomer in the presence of water and a suspension stabilizer, wherein the Mooney viscosity [ML(1+4)100℃] of the polymer having cis-1,4-polyisoprene as the main skeleton is 18-65 as defined in JIS K 6300, and the vinyl monomer includes a monofunctional vinyl monomer having only one vinyl group and a crosslinkable vinyl monomer having multiple vinyl groups.

The application provides a phosphoric acid doped polybenzimidazole high-temperature proton exchange membrane and a preparation method thereof. In the membrane material, the mass fraction of the phosphoric acid in the polybenzimidazole polymer ranges from more than 0 wt.% to not more than 3000 wt.%. The membrane is prepared through the following steps: S1, dissolving the polybenzimidazole polymer in a solvent, adding phosphoric acid to obtain a composite solution; S2, casting the composite solution on a film forming container, and drying to obtain the phosphoric acid doped polybenzimidazole high-temperature proton exchange membrane. The phosphoric acid doped polybenzimidazole high-temperature proton exchange membrane can not only prepare a stress-free HT-PEM to prevent phosphoric acid loss, but also can arbitrarily and accurately control the phosphoric acid doping amount and the thickness of the prepared membrane through the solution composition and volume, so as to prepare a stress-free phosphoric acid doped polybenzimidazole composite HT-PEM with high stability and ultrahigh specific proton conductivity.

The present invention provides a fiber material with antibacterial function and a preparation method thereof, relating to the technical field of antibacterial materials. The present invention combines multiple processes, such as antibacterial agent synthesis, polymer dissolution, and uniform dispersion of the antibacterial agent in the polymer, into one process, which can be completed in the same reactor. This conveniently utilizes the same solvent to achieve in-situ preparation of the antibacterial agent and polymer dissolution, saving time and effort. The nonwoven material prepared by the present invention has good air permeability of 200 to 400 mm / s, a longitudinal breaking strength of greater than 200 N, and a transverse breaking strength of greater than 150 N. It exhibits excellent antibacterial effects, with an inhibition rate against Escherichia coli, Staphylococcus aureus, and Helicobacter pylori exceeding 99.8%. Its antiviral activity against the RNA virus H1N1 reaches 98.24%.

The invention discloses a preparation method of a stretchable flexible thermally conductive material, comprising the following steps: synthesizing P(M-PDA-EGDMA): placing EGDMA, M-PDA and an initiator in a container of N,N-dimethylformamide (DMF), introducing argon into the mixture, heating the mixture to 55-65°C and stirring, and polymerizing to obtain a reaction mixture; preparing P(M-PDA-EGDMA) / BN: dissolving a polymer P(M-PDA-EGDMA) in an ethyl acetate solution to obtain a polymer solution, adding a rod-shaped silver nanoparticle solution to the polymer solution, mixing uniformly, and forming a film using 3D printing to obtain a three-dimensional structure; freeze-drying to obtain a three-dimensional porous fiber; and filling the porous fiber with boron nitride nanoparticles, a high thermal conductivity filler, to prepare the stretchable flexible polymer thermally conductive material.

The invention relates to a method for preparing high-modulus para-aramid by using a benzoxazine coating containing functional particles, which comprises the following steps: (1) dissolving a benzoxazine polymer in dichloromethane at room temperature to obtain a benzoxazine solution, and then adding the functional particles for ultrasonic dispersion; (2) dipping para-aramid wet fibers in the benzoxazine solution containing the functional particles prepared in the step (1) to obtain para-aramid containing a benzoxazine coating containing the functional particles; and (3) in a dry nitrogen atmosphere, carrying out constant-tension heat treatment on the para-aramid fiber containing the functional particle benzoxazine coating prepared in the step (2) to prepare the high-modulus para-aramid fiber. According to the method, the tensile modulus of the aramid fiber can be remarkably improved, meanwhile, the damage to the strength is reduced, the operation is simple, the production cost is low, and industrial production of the high-modulus para-aramid fiber is facilitated.