93 results about "High performance polymer" patented technology

The invention relates to a high-performance polymer-cement-based composite repair material and a preparation method thereof, and the high-performance polymer-cement-based composite repair material comprises the following components by mass: 690-710 parts of cement; 130 to 150 parts of fly ash; 45 to 55 parts of silica fume; 200 to 210 parts of mixing water; 950 to 1050 parts of fine aggregate; 21-23 parts of a modified polymer; 9-10 parts of an expanding agent; 4-5 parts of a water reducing agent; 5-6 parts of modified fiber; and 0.16 to 0.18 part of a defoaming agent. The nano-toughened modified polymer and the modified fiber are used, the nano-modified polymer can improve the microstructure of the repair material, the modified fiber can limit shrinkage of the repair material and enhance the crack resistance of a matrix, the toughness and the mechanical property of the repair material can be effectively improved through the synergistic effect of the nano-modified polymer and the modified fiber, and it is guaranteed that the repair material does not crack in the early stage.

The invention discloses application of metal phthalocyanine in polymer solid electrolyte and an all-solid-state lithium / sodium battery. Metal phthalocyanine is adopted to prepare a PVDF-based polymer solid electrolyte, and then the PVDF-based polymer solid electrolyte is used as a positive electrode component to be used in a polymer all-solid-state sodium battery, or metal phthalocyanine is adopted to prepare a PEO-based polymer solid electrolyte, and then the PEO-based polymer solid electrolyte is used as a negative electrode component to be used in an all-solid-state lithium battery. And the preparation of the high-performance polymer all-solid-state lithium / sodium battery at room temperature can be realized. A metal phthalocyanine network with a plane pi-conjugated structure is introduced into a PVDF or PEO matrix, metal in metal phthalocyanine is Zn, Co or Fe, preparation of the all-solid-state sodium / lithium metal battery is achieved, and the prepared all-solid-state sodium / lithium metal battery has high cycling stability.

The invention relates to the technical field of high-performance polymer material processing, in particular to a high-strength and high-modulus polyethylene fiber spinneret plate forming system and method.The system comprises a melt state monitoring module, a dynamic rheological coordination module, a micro-flow field reconstruction module, a molecular chain orientation module and an extrusion stabilization module; wherein the melt state monitoring module is used for acquiring an orientation degree real-time value and a pressure fluctuation value of a melt at an inlet of a spinneret plate; the dynamic rheological coordination module is used for generating a shear rate adjusting instruction and a pressure compensation instruction; the micro-flow field reconstruction module responds to the instruction and outputs a melt meeting a preset shear distribution condition; and the molecular chain orientation module is used for generating an axial stretching flow field in the convergence flow channel. According to the invention, through a melt state driven multistage flow field regulation and control and chain segment orientation control mechanism, the cooperative guarantee of orientation degree improvement and extrusion stability in the high-strength and high-modulus polyethylene fiber spinning process is realized.

The invention belongs to the technical field of high polymer materials, and particularly relates to a high-performance polymer material and application thereof in battery protection. The high-performance polymer material comprises a component A and a component B. The component A is prepared from the following raw materials in parts by weight: 60-80 parts of polyoxypropylene polyol D3000; 20 to 40 parts of polyether polyol 4110; 40 to 60 parts of isocyanate; the component B is prepared from the following raw materials in parts by weight: 50 to 70 parts of amino-terminated polyether; 40 to 50 parts of a chain extender; 1-3 parts of a dispersant; 2-4 parts of a defoaming agent; 4-8 parts of a flame retardant compound A; 3 to 7 parts of a polyphosphazene coated Ce doped g-C3N4 composite material; and 2 to 6 parts of a Cu-MOF material. The flame retardant compound A is self-made and added in the preparation process, and is matched with the polyphosphazene-coated Ce-doped g-C3N4 composite material and the Cu-MOF material, so that the flame retardant property of the polymer material is improved, the flame retardant property of the polymer material is also improved, and a good protection effect can be achieved in battery protection.

An article, a method of making the same, and a method of using the same are provided. Such an article includes at least one coated layer, which includes a substrate and a coating disposed on the substrate. The coating includes a layered nanomaterial and a solute embedded and distributed in the layered nanomaterial. The solute comprises at least one salt soluble in a solvent. The substrate comprises a polymer, for example, a high-performance polymer such as polyether ether ketone and poly(para-phenylene terephthalamide). The article is used for thermal management applications, for example, as protective garment.

The invention belongs to the technical field of polymer synthetic materials, and particularly relates to bio-based MS resin and a preparation method thereof. The bio-based MS resin is a free radical copolymer of a methyl methacrylate monomer and a styrene monomer; the methyl methacrylate monomers comprise bio-based methyl methacrylate, isobornyl methacrylate and 3-pinane methacrylate, and the methyl methacrylate monomers comprise methyl methacrylate, isobornyl methacrylate and 3-pinane methacrylate; the styrene monomers comprise styrene and caffeic acid derivatives; based on 100% of the mass of the bio-based MS resin, the methacrylate monomer accounts for 30%; the molar ratio of caffeic acid derivatives to styrene in the styrene monomers is 1: (1-9). The synthesized bio-based MS resin has the characteristics of greenness and reproducibility, compared with petroleum-based MS resin, the performance of the MS resin can be regulated and controlled by designing a protecting group of a bio-based caffeic acid derivative so as to expand the application range of the MS resin, a specific functional group can be introduced to prepare a functional, advanced and high-performance polymer material, and the MS resin has a good market prospect.

The invention relates to the technical field of high-performance polymer synthesis, in particular to a preparation method of polyaryletherketone, which comprises the following steps: S1, under the condition of inert gas, adding dihalogenated benzophenone and bisphenol fluorene into a solvent, uniformly mixing, adding alkali carbonate, and reacting under the condition of heating to obtain an oligomer; s2, adding aromatic diphenol into the system in the step S1 in batches, and carrying out temperature programming reaction to obtain a block copolymer; and S3, adding an end-capping reagent into the system to carry out end-capping reaction, and after the reaction is finished, carrying out post-treatment to obtain the polyaryletherketone. According to the preparation method of the polyaryletherketone, a feeding mode of gradient segmented feeding is adopted, a polymerization process of low-temperature pre-polycondensation and high-temperature chain extension copolymerization is developed, the reaction rate is controllable, sequence distribution is uniform, and product performance is stable. In addition, the preparation method can effectively reduce energy consumption and is more beneficial to industrial production.

The invention discloses high-performance polymer modified asphalt, a preparation method thereof and a waterproof coiled material, and the high-performance polymer modified asphalt comprises the following components in parts by weight: 60-65 parts of petroleum asphalt, 12-14 parts of SBS, 2-4 parts of SEBS, 2-4 parts of EVA, 1-3 parts of oil, 2-4 parts of a cross-linking agent, 1-2 parts of an antibacterial agent and 10-20 parts of an inorganic filler. The high-performance polymer modified asphalt is excellent in waterproof performance, and the preparation method is simple; the prepared waterproof coiled material has good low-temperature flexibility at-50 DEG C and excellent antibacterial property.

A material composition to prepare a polymer electrolyte precursor composition capable to form a solid polymer electrolyte, which has: A) a comb-branched polymer with pendant functional groups; B)surface-modified silica particles; and C) a polymerizable solvent or a crosslinker; wherein the silica particles are capable to be dispersed in the polymerizable solvent or a non-polymerizable volatile organic solvent and form a colloidal silica dispersion can be made. The material composition can be used in preparation of a solid polymer electrolyte in a lithium ion battery to improve performance, a polymer electrolyte precursor composition, a preparation method of a solid polymer electrolyte, a method to prepare a lithium ion battery, a solid polymer electrolyte, an electrochemical device and a device.

The invention discloses a cross-scale porous structure and a 3D printing forming method and device, and belongs to the technical field of polymer 3D printing. The method comprises the following steps: heating and melting a polymer wire, injecting gas into a molten polymer so as to form bubbles in the molten polymer, extruding the bubbles in the molten polymer into a vacuum environment along with the molten polymer, and performing 3D printing to form a lattice structure, the macroscopic lattice structure is formed by the bubbles, the macroscopic lattice structure is internally provided with micro-scale holes formed after the bubbles are expanded and cured under the vacuum condition, and the micro-scale holes and the macroscopic lattice structure are combined to form a cross-scale porous structure. Micropores formed by thermal expansion growth of vacuum micropores are combined with macropores of a lattice structure to form a cross-scale effect.

The invention discloses a method for preparing a high-molecular-weight polymer containing an organic acid group through Fenton reaction catalysis, and belongs to the technical field of Fenton reaction catalysis free radical polymerization. The preparation method comprises the following steps: sequentially adding a ferrocene derivative, a monomer containing an organic acid group, a (methyl) acrylamide monomer or a (methyl) acrylate monomer and an RAFT reagent into water, removing oxygen under the protection of inert gas, adding a hydrogen peroxide stock solution, carrying out a constant-temperature reaction, and carrying out a quenching reaction in air to obtain the polymer. The controllable synthesis bottleneck of a narrow-distribution ultra-high molecular weight carboxylic acid group-containing polymer is broken through, metal catalyst residues of ATRP and high-temperature conditions required by NMP are avoided, water is used as a reaction medium, H2O2 is used as a green oxidizing agent, the system is endowed with excellent biocompatibility and environmental friendliness, and the preparation method is suitable for industrial production. The invention provides a novel synthesis method which is accurate and controllable, simple in process and free of complex post-treatment for meeting the requirements of high-performance polymers in the fields of petrochemical engineering, biological medicine, water treatment and the like.

The invention discloses a polymer composite material with magnetism and a preparation method thereof, and belongs to the field of polymer composite materials. The magnetic polymer composite material is prepared by weight from polypropylene, a compatibilizer, polystyrene, a toughening agent, an antioxidant, and a lubricant. The polystyrene is modified by magnetic nano-ferroferric oxide, and the modified magnetic polystyrene and polypropylene and an additive are melt-blended in a certain proportion to obtain a high-performance polymer composite material with magnetism. Due to the unique magnetic properties of the composite material, the application field of the material can be expanded, and it can be applied in magnetism-related fields such as electromagnetic shielding and microwave absorption.

The invention relates to liquid crystal polyesterimide based on bio-based diamine and a preparation method of the liquid crystal polyesterimide, the processing performance of a high-performance liquid crystal polymer can be effectively optimized by a bio-based imide diacid monomer, and the environment friendliness of the liquid crystal polymer is ensured by a bio-based raw material source; a new strategy is provided for developing a next-generation high-performance polymer material.

The invention discloses a method for continuously synthesizing thermoplastic polyimide through polymerization-extrusion granulation, and relates to the technical field of high-performance polymer synthesis, and the method comprises the following specific steps: mixing dianhydride and diamine monomer according to a ratio, and reacting in a water-containing solvent or a pure water phase to obtain an oligomer mixture; carrying out flash evaporation under the negative pressure of-0.01 to-0.1 MPa to recover the solvent / water, so as to obtain polyimide oligomer powder; drying the powder, mixing the dried powder with an auxiliary agent and other flexibilizers, carrying out stepped heat treatment in a nitrogen atmosphere, conveying the mixture into a screw machine through a screw, extruding, and pelletizing to obtain thermoplastic polyimide particles; the continuous production of the thermoplastic polyimide is realized by integrating core procedures, and the material loss and the time cost are reduced; and auxiliary materials such as the antioxidant and the flexibilizer are added, so that the product performance is improved, the application range is widened, and efficient and low-carbon production is realized.

A magnetic field-assisted additive manufacturing (MFAAM) system and method for fabricating anisotropic bonded magnets. The system includes a magnetic field source assembly including a modular Halbach holder, an inner Halbach holder, and a Halbach cylinder configured to provide a magnetic field for aligning magnetic fillers within a polymer matrix during extrusion. The field gradient of the Halbach cylinder is less than 0.0005 T / mm allowing to obtain high print quality in a large magnetic field. To enable high-temperature processing, the assembly incorporates a cooling casing fluidly coupled to a cooling medium. This active thermal management maintains the Halbach cylinder below a threshold temperature while a heated nozzle extrudes the composite material at temperatures sufficient to melt high-performance polymers. The integration of the magnetic source and cooling jacket allows for the precise alignment of magnetic domains in high-viscosity matrices, resulting in 3D-printed bonded magnets with consistent magnetic anisotropy and improved structural properties.

The invention belongs to the field of high-performance polymers, and relates to an olefin copolymer elastomer and a preparation method thereof. The olefin copolymer elastomer contains an ethylene structural unit, a propylene structural unit, a structural unit derived from cycloolefin and a structural unit derived from norbornene containing exocyclic double bonds; the cycloolefin is selected from at least one of compounds as shown in a formula 1; the norbornene containing exocyclic double bonds is selected from at least one of compounds shown in a formula 2 and a formula 3; in the formula 1 # imgabs0 #, a is an integer from 0 to 10; r < 1 > to R < 12 > are respectively and independently selected from hydrogen, alkyl groups of C < 1 > to C < 20 > or naphthenic groups of C < 4 > to C < 20 >; in the formula 2 and the formula 3, b is an integer of 0-10; and R < 13 > to R < 19 > are respectively and independently hydrogen or alkyl with 1 to 20 carbon atoms. The olefin copolymer elastomer disclosed by the invention has the properties of high light transmittance, high refractive index, excellent mechanical properties, excellent elasticity and the like.

The invention belongs to the technical field of thermal protection materials, and particularly relates to a high-performance polymer flexible ablation thermal protection material capable of generating high-temperature-resistant ceramic in situ. Through molecular design, the zirconium-containing vinyl silicone oil (VZSO) is synthesized, and high-temperature-resistant ceramic can be generated in an ablation environment. VZSO and vinyl silicone oil are linked through polymethylhydrosiloxane through a hydrosilylation reaction, VZSO modified silicone rubber (VZSO-SR) is obtained, and molecular-level compatibility and covalent binding of a zirconium-containing unit and a siloxane molecular chain are achieved. The VZSO-SR has high heat residual weight in the air; in addition, the VZSO-SR also has excellent ablation resistance, and can effectively reinforce the carbon layer through in-situ generation of high-temperature-resistant t-ZrO2 ceramic. The VZSO-SR provided by the invention provides a new material choice for developing a high-performance polymer flexible ablation-resistant material suitable for an ultrahigh-temperature environment, and has a good application prospect.

This invention discloses a high-performance polymer electrolyte based on a functionalized fluorinated ether diluent and its preparation method, relating to the field of electrochemical energy storage materials technology. The high-performance polymer electrolyte comprises: a polymer matrix, a lithium salt, an organic dispersion solvent, and a functionalized fluorinated ether diluent. By introducing a fluorinated ether diluent with a specific structure, this invention synergistically regulates the crystallization behavior of the polymer matrix and the lithium-ion solvation structure, solving core problems in traditional polymer electrolytes such as low ionic conductivity, poor interfacial stability, and lithium dendrite growth. The resulting electrolyte possesses high ionic conductivity, high lithium-ion transference number, and excellent interfacial stability, making it suitable for high-energy-density lithium metal batteries.

The invention belongs to the technical field of high polymer material synthesis processes, and provides a heat-resistant fluorine-free low-dielectric polyarylene ether nitrile copolymer film and a preparation method thereof. The preparation method comprises the following steps: firstly, initiating a polymerization reaction by adopting a nucleophilic substitution reaction under a precise temperature control condition to obtain polyarylene ether nitrile, then heating and dissolving the polyarylene ether nitrile in N-methyl pyrrolidone, forming a uniform thin film by adopting a casting film forming technology, and finally, finishing the forming of the thin film through a gradient heating procedure to prepare the polyarylene ether nitrile copolymer thin film. The molecular engineering strategy adopted by the invention does not depend on the addition of fluorine element to reduce the dielectric constant, also avoids the inevitable mechanical property loss when the crosslinking strategy is adopted, and effectively overcomes the technical bottleneck that the sustainability and durability are difficult to consider in the research and development process of the high-performance polymer; an ideal material solution with excellent thermal stability and low dielectric property is provided for the fields of electronic packaging, high-frequency circuits and the like.

The invention belongs to the technical field of high-performance polymer resin and ion exchange membranes thereof, and relates to a preparation method and application of cross-linked polybenzimidazole resin and an anion exchange membrane thereof. The preparation method comprises the following steps: carrying out copolymerization reaction on aromatic tetramine and dicarboxylic acid to obtain polybenzimidazole resin, and then reacting with a cross-linking agent to obtain cross-linked polybenzimidazole. The preparation method comprises the following steps: carrying out graft modification on polybenzimidazole, reacting with a cross-linking agent, paving the membrane, and carrying out alkali exchange to obtain the functionalized cross-linked polybenzimidazole anion exchange membrane. The cross-linked polybenzimidazole resin prepared by the preparation method disclosed by the invention can be applied to aerospace, automobiles and ships, transportation and other industries. The prepared cross-linked polybenzimidazole anion exchange membrane is excellent in mechanical property and alkali-resistant stability, good in ionic conductivity, low in cost and wide in application prospect in ion exchange membrane water electrolysis, fuel cells, membrane separation and the like.

The invention relates to a plug flow type prepolymerization device, and aims to realize transition or conversion from a batch polymerization process to a continuous polymerization process. The device comprises a specially designed compact reactor body, wherein heat transfer elements are integrated on the wall surface and a shaft of the reactor body; the special stirring system is provided with a wall type stirrer and a central stirrer which can be independently operated; the plurality of feed ports are used for accurately controlling and uniformly dispersing an initiator, a monomer, a solvent and an additive; and an optimized temperature distribution system. This design minimizes the formation of gels and color while ensuring controllable reaction kinetics. The device can promote the production of a polymer with controllable molecular weight distribution, synthesizes a functionalized polymer precursor when a specific functional agent is added, and is used for the production of a special high-performance polymer, so that the flexibility of the process is improved, the consistency is improved, and the cycle time is shortened.

The utility model discloses a lightweight high-strength communication cable, which comprises a conductor assembly, an insulating layer, a shielding layer, an enhancement layer and an outer protective layer, the conductor assembly is composed of a silver-coated copper wire, the diameter of the silver-coated copper wire is set to be 0.5 mm, the conductor assembly is of a multi-core structure composed of a plurality of silver-coated copper wires, and the outer protective layer is arranged between the plurality of silver-coated copper wires. The shielding layer is composed of a shielding layer inner layer and a shielding layer outer layer, the shielding layer inner layer is made of a silver-plated polyester film, the shielding layer outer layer is made of a woven nickel-coated aluminum metal net, the reinforcing layer is composed of a first reinforcing layer and a second reinforcing layer, the first reinforcing layer is made of Kevlar fiber braided fabric, and the second reinforcing layer is made of a Kevlar fiber braided fabric. And the reinforcing layer II is made of a high-performance polymer. Through the above structure, compared with a traditional steel or metal enhancement layer, the cable is light in weight and high in strength, the overall weight of the cable is further greatly reduced, installation and maintenance are convenient, the effect of double shielding layers is achieved, and signal integrity and anti-interference performance are guaranteed.

The invention discloses a high-performance polymer composite lithium battery and a preparation method thereof, and relates to the technical field of lithium batteries. The invention first bakes the semi-finished battery core to remove moisture in the battery core; after liquid injection, the battery core is activated and formed under a certain pressure to activate the electrochemical activity of the electrode material; then secondary packaging, cutting, folding and ironing are performed to reduce the risk of short circuit; high-temperature aging is performed to extend the service life; finally, the capacity is divided and the battery is packed into boxes to obtain a high-performance polymer composite lithium battery. The semi-finished battery core is added with active substances and polyvinylidene fluoride to the positive electrode, and graphene is added to the negative electrode to improve the high-rate charge and discharge capacity of the battery; then the S-shaped multi-roller traction belt is used for coating, and the parameters of each roller are controlled to improve the overall performance consistency of the battery; then the particle gap is reduced by rolling to improve the rate performance of the battery; then the pole piece and the pole ear are ultrasonically welded to improve the overall performance of the battery; finally, winding, shell punching, and top side sealing are performed to extend the service life of the battery.

The utility model discloses a multifunctional durable pavement structure with a polymer reactive base layer. A high-viscosity drainage asphalt concrete upper surface layer, a first asphalt waterproof bonding layer, a high-performance asphalt concrete middle surface layer, a second asphalt waterproof bonding layer, a modified asphalt concrete lower surface layer, a high-performance waterproof bonding layer, an asphalt stabilized macadam upper base layer, a high-shear-strength graded macadam lower base layer and a cement stabilized macadam upper subbase layer are sequentially arranged from top to bottom. A cement stabilized macadam lower subbase layer, a graded macadam layer and a roadbed; and the high-shear-strength graded broken stone lower base layer is a high-performance polymer HPM cemented graded broken stone base layer. Layered structures in the pavement structure are selected, and various different layered structures are matched with one another, so that the problem of reflection cracks generally existing in a semi-rigid base layer can be effectively solved, the durability of the pavement is improved, and the service life of the pavement is prolonged.

The invention provides a rigid suspension group modified epoxy resin material as well as a preparation method and application thereof, and belongs to the field of advanced materials. The epoxy compound shown in the formula I is prepared by introducing a rigid suspension group into an epoxy resin system, so that the free volume of the further cured epoxy resin material is effectively regulated and controlled, and the compactness of a network is remarkably improved. The glass transition temperature, the mechanical property and the thermal stability of the epoxy resin prepared by the method are remarkably improved. The invention provides a new strategy for optimizing the performance of the epoxy resin, and lays a theoretical foundation for designing a high-performance polymer material. # imgabs0 #

The invention belongs to the technical field of functional stealth coatings, and particularly relates to a wide-frequency-band heat-insulation stealth multi-layer composite coating and a preparation method thereof.The wide-frequency-band heat-insulation stealth multi-layer composite coating comprises a bottom layer, a middle layer and a surface layer which are sequentially coated on the surface of a base material; the bottom layer comprises high-performance polymer resin, a curing agent, a magnetic absorbent, 10-30% of a conductive / dielectric loss agent, an inorganic filler, a coloring pigment, an auxiliary agent and a diluent; the middle layer comprises polymer matrix resin, a cross-linking agent, a high-thermal-conductivity filler, a low-infrared-emissivity material, a microencapsulated phase change material, an auxiliary agent and a diluent; the surface layer comprises weather-resistant resin, a cross-linking agent, a multispectral compatible pigment, a flaky protective filler, a wear-resistant filler, an auxiliary agent and a diluent. The functional layers have excellent compatibility, the surface layer does not damage the wave absorbing performance of the bottom layer and the infrared regulation and control function of the middle layer, the middle layer guarantees the heat diffusion efficiency and does not affect the electromagnetic loss of the bottom layer, the performance stability can be maintained for a long time through strict aging verification, and the equipment maintenance period is greatly prolonged.

The shuttle and door ring assembly comprises an intelligent lubricating composite phase composed of a hydrogenated nitrile rubber thermally-induced softening phase and a solid lubricant, a high-performance polymer and a multi-scale heat conduction network are supplemented, and when equipment runs at a high speed to generate friction heat or vibration, mechanical energy can be efficiently converted into heat energy; and the heat triggers the intelligent lubricating composite phase to generate phase change, so that the solid lubricant is actively and controllably released to a friction interface, and an efficient lubricating film is formed. The problems that a traditional shuttle is fast in abrasion and large in vibration noise, relies on grease lubrication and the like are solved, the operation efficiency and the fabric quality of the circular weaving machine are remarkably improved, the service life of the circular weaving machine is remarkably prolonged, and long-acting self-lubrication, vibration reduction, noise reduction and clean production are achieved.

The invention discloses an oxygen vacancy enriched lithium-doped zinc oxide nanotube reinforced polyethylene oxide (PEO)-based solid electrolyte and a preparation method thereof. The electrolyte takes PEO as a polymer matrix, lithium bis (trifluoromethanesulfonimide) (LiTFSI) as a lithium salt, and a three-dimensional hollow ZnO nanotube (LZN) doped with a lithium element as an inorganic reinforcing filler. By introducing Li < + > into ZnO crystal lattices for doping, a large number of positively charged oxygen vacancies can be induced to form, and the oxygen vacancies as Lewis acid sites have strong interaction with lithium salt anions to promote dissociation of lithium salt, so that the free Li concentration and ion mobility in the system are improved. The three-dimensional interconnection structure of the hollow nanotube constructs a continuous organic-inorganic ion transmission channel at the same time, so that the interface impedance is further reduced, and the overall ionic conductivity of the electrolyte is improved. The Li < + > conductivity of the prepared composite solid electrolyte at 60 DEG C can reach 8.12 * 10 <-4 > S / cm, and the composite solid electrolyte has excellent electrochemical stability and high coulombic efficiency. LiFePO4 / Li and NCM622 / Li all-solid-state batteries assembled by using the electrolyte membrane show good cycling stability and high-voltage adaptability. Through collaborative design of oxygen vacancy engineering and a hollow structure, the comprehensive performance of the polymer electrolyte is remarkably improved, and a new solution is provided for development of a high-energy-density and long-service-life all-solid-state lithium battery.

The invention relates to the technical field of high-performance polymer fiber manufacturing, in particular to a low-processing-viscosity liquid crystal polyarylester fiber and a preparation method thereof.The preparation method comprises the steps that S1, p-hydroxybenzoic acid and 2-hydroxy-6-naphthoic acid serve as monomers, and an acetylation reaction is conducted in the presence of an acetylation reagent and a catalyst; the preparation method comprises the following steps: firstly, preparing LCP resin, then carrying out melt polycondensation reaction, adding 6-acetoxy-2-naphthoic acid at the later stage of the melt polycondensation reaction, stirring and dispersing, discharging, cooling and granulating to obtain the LCP resin; and S2, carrying out melt spinning and heat treatment on the LCP resin to obtain the liquid crystal polyarylate fiber. According to the preparation method, the melt processing viscosity of the resin can be remarkably reduced, the production smoothness is improved, the heat treatment time is shortened, the production energy consumption is reduced, the high molecular weight potential of the resin in spinning processing is not influenced, and the liquid crystal polyarylate fiber is ensured to have very good strength performance.

The present invention discloses a cross-scale porous structure, a 3D printing forming method, and an apparatus, belonging to the field of polymer 3D printing technology. The method of the present invention comprises heating and melting a polymer filament, injecting a gas into the molten polymer to form bubbles in the molten polymer, and extruding the bubbles in the molten polymer into a vacuum environment for 3D printing into a lattice structure. The lattice structure has microscopic pores formed by the bubbles expanding and solidifying under vacuum conditions. The microscopic pores are combined with the macroscopic lattice structure to form a cross-scale porous structure. The present invention utilizes the pressure differential enhancement effect of a vacuum environment to overcome the high surface tension of high-performance polymers, combining the microscopic pores formed by the thermal expansion growth of vacuum micropores with the macroscopic pores of the lattice structure to form a cross-scale effect.