264 results about "Polyether ether ketone" patented technology

The invention discloses a multi-layer protection cable resistant to an extreme environment, and belongs to the technical field of cables. The cable is of a seven-layer composite structure design and sequentially comprises a conductor, an insulating layer, a shielding layer, a buffer layer, a waterproof layer, a heat insulation layer and a protective outer layer from inside to outside, and the conductor is made of high-purity oxygen-free copper; the insulating layer is made of a polyimide material and has high temperature resistance, low temperature resistance and excellent insulating property; the shielding layer is composed of a tinned copper wire woven mesh and a high-permeability permalloy foil, and electromagnetic interference is effectively shielded; the buffer layer is made of an elastic rubber material to relieve mechanical stress; the waterproof layer adopts a nanoscale fluorosilicone resin coating and has excellent waterproof performance; the heat insulation layer is made of ceramic fibers and aerogel, and efficient heat insulation is provided; and the protective outer layer is made of a high-strength and corrosion-resistant polyether-ether-ketone (PEEK) material. The cable has excellent high temperature resistance, low temperature resistance, corrosion resistance and electromagnetic interference resistance, is suitable for extreme environments, and ensures stable transmission of electric power and signals under extreme conditions.

The invention discloses a preparation process of a high-temperature-resistant and wear-resistant polymer composite material, which comprises the following preparation steps: (1) selecting polyether-ether-ketone as matrix resin, and drying the matrix resin at 150 DEG C for 4 hours; (2) preparing porous sphere-like boron carbide ceramic powder; (3) carrying out surface treatment on the prepared porous sphere-like boron carbide ceramic powder; and (4) uniformly mixing the boron carbide ceramic powder subjected to surface treatment in the step (3) and polyether-ether-ketone in a mild mixing manner, compounding with carbon fibers, and extruding and granulating by using a double-screw extruder to obtain the high-temperature-resistant and wear-resistant polymer composite material. Through the mode, the composite material prepared by the method does not contain PFAS chemical substances, is superior to the existing PTFE material in the aspects of wear resistance, environmental protection property, high temperature resistance and the like, and is an ideal reliable PTFE substitute material.

The invention discloses a wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part for LPBF and a forming method of the wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part, and belongs to the technical field of additive manufacturing. The forming method comprises the steps that polyether-ether-ketone powder and molybdenum disulfide powder are pretreated according to different modes; after pretreatment, the two kinds of powder are mechanically mixed according to a specific proportion, and wide-temperature-range polyether-ether-ketone-based self-lubricating composite material powder is obtained; and carrying out printing forming on the polyether-ether-ketone-based self-lubricating composite material powder by adopting a laser powder bed melting (LPBF) specific process to obtain a wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part. Molybdenum disulfide is adopted to enhance the friction and wear performance of polyether-ether-ketone in a wide temperature range, the printability of powder is improved through special pretreatment, and a high-performance wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part suitable for high and low temperature extreme environments is obtained through forming by adopting specific LPBF processes such as multidirectional cross scanning and the like.

The invention discloses a polyether-ether-ketone-based composite material with low reflection and high electromagnetic shielding effectiveness and a preparation method of the polyether-ether-ketone-based composite material, and belongs to the technical field of electromagnetic shielding materials. The problems that an existing electromagnetic shielding material is high in reflection coefficient, insufficient in shielding effectiveness, poor in high temperature resistance and corrosion resistance and difficult to adapt to severe environment service are solved. The composite material is composed of a porous conductive substrate and an asymmetric conductive layer. Wherein the porous conductive substrate is formed by blending a soluble ketimine type polyether-ether-ketone solution and a conductive filler suspension and then carrying out non-solvent induced phase separation and acidification reduction reaction, the electric conductivity is 2.8 * 10 <-4 >-0.1839 S / cm, and the porosity is 80%-90%; the asymmetric conductive layer is plated on the surface of one side of the porous conductive substrate, and the asymmetric conductive layer is made of nickel-phosphorus alloy. The composite material significantly reduces the electromagnetic wave reflection coefficient through an absorption-reflection-reabsorption mechanism, has high electromagnetic shielding effectiveness and excellent high temperature resistance and corrosion resistance, and is suitable for serving in a severe environment.

A bellows shaped spinal implant, comprising an upper plate, a lower plate and a bellows shaped shell extending between and joining the upper and lower plates. The bellows shaped shell is formed of titanium or an alloy comprising titanium and includes a wall extending therearound that defines a hollow interior. The wall has a thickness in the range of 0.5 mm to 1.0 mm to provide for radiographic imaging through the wall. The wall is angled or curved inwardly or outwardly between the upper and lower plates to provide stiffness mimicking the stiffness properties of a similarly sized polyetheretherketone (PEEK) implant. The upper and lower plates each comprise porous contact regions including a three-dimensional gyroid lattice structure defined by a plurality of struts and pores in communication with the hollow interior. The outer surfaces of at least a portion of the struts may comprise a laser ablated textured surface.

The invention relates to the technical field of bioanalytical chemistry, in particular to a method for simultaneously enriching and separating glycopeptides and phosphopeptides by using a bionic hydrophilic adsorbent, which specifically comprises the following steps: step 1, preparing a polyether-ether-ketone (PEEK) framework by using a fused deposition modeling method (FDM); 2, soaking the obtained PEEK framework in an aqueous solution containing dopamine hydrochloride and tris (hydroxymethyl) aminomethane, and carrying out a reaction; step 3, then, adding a mixed solution containing hyaluronic acid methacrylate, vinyl phosphoric acid, N, N-dimethyl bisacrylamide and phenyl-2, 4, 6-trimethylbenzoyl lithium phosphate into the PEEK framework; in the invention, in the aspect of material preparation, a fused deposition modeling method (FDM) is adopted to prepare a polyether-ether-ketone (PEEK) frame, and the material has good mechanical properties and chemical stability and can bear a series of subsequent complex treatment processes without being damaged.

The invention discloses a high-performance polyether-ether-ketone modified sealing material and a preparation method thereof, and relates to the technical field of sealing materials. The high-performance polyether-ether-ketone modified sealing material is prepared from the following raw materials in percentage by mass: 5 to 10 percent of polytetrafluoroethylene micro powder, 5 to 10 percent of graphene nanosheets, 10 to 15 percent of silicon carbide whiskers, 0.5 to 2 percent of silane coupling agent and the balance of polyether-ether-ketone, the preparation method of the high-performance polyether-ether-ketone modified sealing material comprises the following steps: mixing graphene nanosheets with a silane coupling agent, deionized water and absolute ethyl alcohol, carrying out ultrasonic dispersion for 2 hours, carrying out pretreatment to obtain a graphene nanosheet suspension, mixing the graphene nanosheet suspension with silicon carbide whiskers, polytetrafluoroethylene micro powder and polyether-ether-ketone, carrying out melt blending, and carrying out compression molding to obtain the high-performance polyether-ether-ketone modified sealing material. And cooling to obtain the high-performance polyether-ether-ketone modified sealing material.

The invention discloses a graphene-based high-strength heat-conducting film and a preparation method thereof, belongs to the technical field of heat-conducting film preparation, and aims to solve the technical problem that the strength and corrosion resistance of a heat-conducting film in the prior art need to be further improved. Graphene-aromatic phosphonate heat-conducting resin, maleic anhydride grafted fluorinated polyether-ether-ketone and fluorinated siloxane elastomer are jointly applied to membrane material preparation, so that the material forms a system with a continuous structure in the aspects of heat-conducting framework construction, interface connection and deformation slow release, the graphene-aromatic phosphonate heat-conducting resin provides a high-efficiency heat-conducting path, the maleic anhydride grafted fluorinated polyether-ether-ketone realizes stable interface bonding, and the fluorinated siloxane elastomer endows the membrane material with a structure retention capability under an external force and a medium environment. The obtained high-strength heat-conducting film has relatively high heat conductivity coefficient, strength and quality stability in an acid-base environment, and shows excellent comprehensive performance.

The invention discloses a high and low temperature resistant polyamide cable tie and a preparation method thereof, and relates to the technical field of polyamide cable ties. The high and low temperature resistant polyamide cable tie comprises the following components in parts by weight: 40 to 60 parts of polyamide-6, 12 to 15 parts of a modifier, 5 to 15 parts of polyether-ether-ketone, 15 to 20 parts of modified glass fiber, 5 to 10 parts of a flexibilizer, 0.5 to 1 part of an antioxidant and 0.3 to 0.6 part of a lubricant. By controlling reaction conditions, lignin is prevented from being dissolved, modification grafting is carried out on the surface of the lignin, a sulfonate group, a polyether-ether-ketone chain segment, a polydimethylsiloxane chain segment and an anhydride structure are introduced, meanwhile, the rigid structure of the lignin is kept, and then the modifier is prepared. The modifier can further cooperate with polyether-ether-ketone, modified glass fibers and a flexibilizer to effectively improve the mechanical properties and high and low temperature resistance of polyamide-6.

The invention provides a synchronous crosslinking type flame-retardant cable composite material and a preparation method thereof, and belongs to the technical field of cable materials. Partial discharge is inhibited through high dielectric constant and polarization performance of transition metal zirconium phosphate, a carbonized layer is generated at high temperature, and the flame retardant property is improved; the modified fiber combines high orientation of liquid crystal macromolecules and excellent mechanical and flame retardant properties of polyether-ether-ketone, and forms a block copolymer through dynamic grafting, so that the toughness, fatigue life and thermal stability of the material are enhanced; the silane-metal complex precursor improves the moisture resistance, flame retardance and heat insulation performance of the material through the water sealing effect of a silicon-oxygen network and a micro-ceramic layer generated at high temperature; all the components show a remarkable synergistic effect in the aspects of flame retardance, electrical performance and mechanical performance, multiple flame-retardant barriers are formed, the electrical performance of the material is stabilized, and the overall mechanical performance and interface stability of the composite material are remarkably enhanced.

The invention relates to the field of fiber sizing agents and polymer-based composite materials thereof, in particular to a sulfonated polyetheretherketone / amino graphene composite sizing agent of aramid fibers and application of the sulfonated polyetheretherketone / amino graphene composite sizing agent. The sizing agent is composed of sulfonated polyetheretherketone, amino graphene, a reinforcing agent and a solvent, sulfonated polyetheretherketone and amino graphene are prepared through a specific process, and the sulfonated polyetheretherketone and the amino graphene are combined with the reinforcing agent to form a stable covalent bond and a cross-linked structure. The surface wettability and mechanical property of the aramid fiber are remarkably improved, the interface bonding force of the aramid fiber and thermoplastic resin is improved, the mechanical strength and toughness of the aramid fiber composite material are improved, and the method is suitable for the field of high-performance composite materials and has important industrial value.

The invention relates to the field of high polymer materials, and discloses an antistatic polyether-ether-ketone composite material for semiconductor devices, the antistatic polyether-ether-ketone composite material comprises the following raw materials by weight: 60-70 parts of polyether-ether-ketone, 20-30 parts of polyetherimide, 3-5 parts of modified carbon nanotubes, 2-4 parts of nano core-shell particles, 0.5-1 part of a coupling agent, and 0.2-0.5 part of an antioxidant; the modified carbon nanotubes are obtained by acidizing carbon nanotubes and grafting imidazolyl quaternary ammonium salt on the surfaces of the acidized carbon nanotubes; according to the antistatic polyether-ether-ketone composite material, through blending of polyetherimide, the melt viscosity of a composite system can be reduced, the problems that polyether-ether-ketone is high in processing temperature and poor in flowability are solved, and the antistatic performance of the composite material is improved. Through the synergistic interaction of the added modified carbon nanotubes and nano core-shell particles, the material is endowed with excellent mechanical properties, wear resistance and antistatic properties.

The invention relates to the technical field of commercial spaceflight, in particular to a self-repairing liquid metal heat pipe for commercial spaceflight, which comprises a polyether-ether-ketone composite pipe, gallium bismuth zinc liquid gold, a micro-nano repairing film, a main hot runner, a pressure detector, a standby hot runner and an emergency plugging valve, and the main hot runner is an axial through channel in the polyether-ether-ketone composite pipe, and the standby hot runners are annularly and circumferentially arrayed along the inner wall of the main hot runner. Compared with heat conduction in the prior art, medium leakage is stopped through cooperative plugging in a damaged scene, so that the heat conduction efficiency is improved, and the service life of the heat exchanger is prolonged. And meanwhile, the detector is in signal linkage with the plugging valve, a heat transfer loop is rapidly switched in the case of serious damage, the continuous and stable thermal control function is achieved, and therefore the on-orbit operation life of a spacecraft is further prolonged.

An extrusion product, such as a film, pipe, or cable / wire sheath, includes a first layer and a second layer. The first layer includes a polymeric material (A) having repeating units of the formula: -0-Ph-0-Ph-CO-Ph I and repeating units of the formula: -0-Ph-Ph-0-Ph-CO-Ph II, where Ph represents a phenylene moiety. The second layer may be a polyaryletherketone (PAEK), such as polyetheretherketone (PEEK). The first layer is intended to reduce the formation of deposits on the die of an extrusion device during extrusion of the product. A method for producing a product including the first layer and the second layer, as well as the use of the polymeric material (A) to reduce the formation of deposits on the die of an extrusion device during extrusion of a second polymeric material, are also described.

The invention relates to a rudder controller-based embracing arm type anti-loosening device which comprises a shell, a cover plate is arranged at the top of the shell, a connector is arranged at the top of the cover plate, a PCB is fixedly connected to the interior of the shell, first mounting columns are fixedly connected to the left side and the right side of the top of the cover plate, and second mounting columns are arranged at the bottoms of the first mounting columns; a cushion block is arranged outside the first mounting column, a clamping hole is formed in the outer portion of the cushion block, a mounting assembly used for conveniently assembling the second mounting column into the first mounting column is arranged at the top of the second mounting column, and two clamping blocks are fixedly connected to the outer portion of the mounting assembly. Through cooperation of the cushion blocks made of insulation polyether-ether-ketone resin, the precisely fixed PCB, the cover plate, the connector and other structures, the effects of precise electrical connection and stable overall structure are achieved, the cushion blocks and the first mounting columns form holding arm type clamping connection through the clamping holes, the bottoms of the cushion blocks make contact with the PCB, electrical interference is isolated through the insulation performance, and the service life of the PCB is prolonged. And meanwhile, high-strength stable support is provided.

Use of a composite as a heat and fire shielding material particularly in batteries, wherein the composite comprises at least one layer of a thermoplastic material, wherein said at least one layer is based on an at least partial consolidation of a mixture of: a. one or more thermoplastic fibers selected from the group consisting of polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyether ketone-ketone (PEKK), polyether imide (PEI), polyether sulfone (PES), polysulfone (PSU), polyphenylene sulfone (PPSU), polyimide (PI), polycarbonate (PC), polyamide (PA), polyaryletherketone (PAEK) or any combination thereof; and b. one or more reinforcement fibers; wherein at least 90 vol % of the one or more reinforcement fibers have an average length according to a gaussian normal distribution of at least 6 mm, preferably of at least 10 mm, more preferably of at least 20 mm.

The invention discloses polyether-ether-ketone and a preparation method thereof, the structure of the polyether-ether-ketone is shown as the following formula (I): # imgabs0 #, R1 is introduced by a bisphenol monomer, n is the number of polymer repeating units, and n is greater than 2. The invention further discloses a preparation method of the polyether-ether-ketone, the solubility of the polyether-ether-ketone in a common solvent is remarkably improved, and the polyether-ether-ketone keeps excellent thermal stability.

This invention belongs to the field of cable technology, specifically a thin-walled oxygen-barrier high-temperature resistant cable, comprising a conductor core and a thin-walled outer sheath. The conductor core has a high-temperature resistant insulation layer made of polyetheretherketone (PEEK) composite material on its outer side. Between the high-temperature resistant insulation layer and the thin-walled outer sheath, from the inside out, are sequentially arranged a ceramicized oxygen barrier layer and a flame-retardant reinforcement layer. The ceramicized oxygen barrier layer is a nano-modified ceramicized silicone rubber layer with a thickness of 0.05–0.15 mm, including an outer layer doped with silicon carbide whiskers and an inner layer doped with zinc borate. This invention prepares an ultra-thin ceramicized layer through gradient doping, resolving the contradiction between thin-walled design and oxygen barrier properties, and effectively improving the interfacial peel strength. This reduces the cable's outer diameter and bending radius, making the cable lightweight and suitable for high-dynamic applications.

The invention belongs to the technical field of proton exchange membranes, and relates to a proton exchange membrane for regulating and controlling a perfluorinated sulfonic acid resin / sulfonated polyether ether ketone interface by liquid crystal ionomer grafted aramid fibers as well as a preparation method and application of the proton exchange membrane. The preparation method comprises the following steps: treating aramid fiber by plasma, grafting a liquid crystal ionomer containing a sulfonic acid group to prepare a functional reinforcer, and blending modified aramid fiber and perfluorinated sulfonic acid resin / sulfonated polyether ether ketone, and casting to form the membrane. According to the technology, through three-dimensional structure optimization, a perfluorinated sulfonic acid resin continuous proton transmission channel is constructed on the mesoscale, the density of sulfonic acid groups of sulfonated polyetheretherketone is regulated and controlled on the molecular scale, and meanwhile modified aramid fiber with the surface enriched with amide groups is introduced to serve as a third-phase reinforcement body; the sulfonated polyetheretherketone and sulfonic acid groups of a two-phase matrix form a multiple hydrogen bond network, the interfacial compatibility is optimized, and the problems of low proton conductivity of sulfonated polyetheretherketone and phase separation of sulfonated polyetheretherketone from perfluorinated sulfonic acid resin are solved. The liquid crystal ionomer synergistically optimizes the proton channel continuity, and a solution is provided for the high-performance proton exchange membrane for the fuel cell.

The present invention discloses a method for predicting and preparing an antibacterial surface of polyetheretherketone based on machine learning and femtosecond laser, including processes such as the establishment of machine learning tools, the preparation of surface structures, the acquisition and analysis of surface topography information, the prediction of antibacterial ability, and experimental verification. The original machine learning method based on surface images can significantly shorten the time required for scientific research to explore high antibacterial structures on the surface of polyetheretherketone, save experimental costs, and lay a foundation for the efficient preparation of green, safe, and reliable implants.

The invention provides a high-temperature-resistant and corrosion-resistant wire cable and a preparation method and application thereof, and belongs to the technical field of wire cables, and the high-temperature-resistant and corrosion-resistant wire cable comprises a conductor, and an insulating layer, a high-temperature-resistant layer and a corrosion-resistant layer which sequentially coat the conductor; the insulating layer is made of a blending material of polytetrafluoroethylene and polyether-ether-ketone, the high-temperature-resistant layer is made of an organic silicon resin composite material reinforced by nano ceramic particles, and the corrosion-resistant layer is made of a fluororubber material containing graphene. Through innovative design and reasonable matching of the materials of all the layers and a specific preparation process, the wire cable has excellent high-temperature resistance and corrosion resistance, and meanwhile good insulativity, conductivity and mechanical strength are guaranteed. Compared with a traditional wire cable, the cable can work stably for a long time in a high-temperature and strong-corrosion environment, the service life is prolonged, the equipment maintenance cost is reduced, and the use safety and reliability are improved.

The invention discloses a high-wear-resistance polytetrafluoroethylene sealing ring and a preparation method thereof, and belongs to the technical field of sealing rings. The invention relates to a high-wear-resistance polytetrafluoroethylene sealing ring, which is prepared from the following components in parts by mass: 100 parts of polytetrafluoroethylene resin (PTFE); 3 parts of nano silicon dioxide (SiO2); 5 parts of graphite powder; 10 parts of chopped carbon fiber; 1 part of a molybdenum disulfide (MoS2) solid lubricant; and 2 parts of polyether-ether-ketone (PEEK) micro powder. The nano silicon dioxide is subjected to surface hydroxylation treatment and then is grafted with the coupling agent, so that the affinity and dispersity of the nano silicon dioxide in a PTFE matrix are improved, the agglomeration phenomenon is avoided, and uniform reinforced phase distribution is formed, thereby ensuring the consistency of the performance of the material.

The invention relates to a method for predicting the hygrothermal aging life of a polyether-ether-ketone-based composite material. According to the method, the change of the surface roughness of the carbon fiber reinforced polyether-ether-ketone composite material along with the aging time is innovatively selected as a basis for judging the aging degree, the surface root mean square roughness is measured by setting the temperature gradient and intermittently sampling, and the aging degree of the carbon fiber reinforced polyether-ether-ketone composite material is judged according to a roughness change kinetic equation and an Arrhenius equation. And a final life prediction model corresponding to the actual environment temperature is obtained. According to the method, the chemical structure, the physicochemical property and the service life are scientifically associated from the perspective of mechanism, and the problems that the index selection standards of a current aging life prediction model are not uniform, the aging degree judgment is not based, and the relevance between property degradation and chemical structure change is insufficient are effectively solved; therefore, accurate prediction of the service life of the carbon fiber reinforced polyether-ether-ketone composite material in the humid and hot environment is realized.

This invention belongs to the field of high-performance thermoplastic composite granule preparation and process optimization technology. Specifically, it relates to a method and system for determining the optimal process for twin-screw extrusion preparation of carbon fiber / polyetheretherketone (PEEK) granules based on numerical simulation and multi-objective optimization. A three-dimensional model of the internal flow channel of the twin-screw extruder is established, and discretization is performed using a mesh stacking method. Multiple simulation conditions are constructed within a preset temperature and extrusion speed range, and process safety constraints are established. The analytic hierarchy process (AHP) – approximation of ideal solution ranking method is used for index standardization, weight allocation, and comprehensive scoring. With process temperature and extrusion speed as decision variables, a non-dominated sorting genetic algorithm is used for multi-objective global search to obtain the Pareto optimal solution set, which is then ranked and optimized to output recommended process parameter combinations. This invention's method can reduce the risk of thermal degradation and fiber damage while considering the mixing effect, and reduces the cost and cycle time of trial and error.

A medical implant (10) includes: a non-metallic core (26) comprising polyetheretherketone (PEEK); and a non-metallic reinforcing layer (34) coupled to the core. The core is at least partially encapsulated by the reinforcing layer, and the reinforcing layer comprises carbon fiber strands.

The invention discloses a packaging high-barrier composite film and a preparation method thereof, and relates to the field of layered materials, the packaging high-barrier composite film sequentially comprises a layer A, a layer B and a layer C; the heat-resistant layer material is prepared from the following raw materials: aluminum oxide and magnesium oxide; the preparation raw materials of the reinforcing layer material comprise a modified ethylene-vinyl alcohol copolymer and polyamide-imide; the barrier layer material is prepared from the following raw materials: a modified ethylene-vinyl alcohol copolymer, high-density polyethylene and polyether-ether-ketone resin; the heat sealing layer material is prepared from the following raw materials: chlorinated polypropylene, a modified ethylene-vinyl alcohol copolymer, polyphenylene sulfide and calcium stearate, the modified ethylene-vinyl alcohol copolymer is prepared from the following materials: an ethylene-vinyl alcohol copolymer, 7-chloro-6-fluoro-1-p-fluorophenyl-1, 4-dihydro-4-oxo-3-quinolinecarboxylic acid, 1, 1-bis (trifluoromethyl)-2, 2, 3, 3, 3, 3-pentafluoropropyl 2-fluoroacrylate and acetone, and the modified ethylene-vinyl alcohol copolymer is prepared from an ethylene-vinyl alcohol copolymer, 7-chloro-6-fluoro-1-p-fluorophenyl-1, 4-dihydro-4-oxo-3-quinolinecarboxylic acid, 1, 1-bis (trifluoromethyl)-2, 2, 3, 3, 3, 3-pentafluoropropyl 2-fluoroacrylate and acetone. The packaging high-barrier composite film provided by the invention is excellent in barrier property.

The present invention relates to a liner for medical catheters, wherein the liner comprises or consists of polyaryletherketone, in particular in the form of polyether ether ketone or sulfonated polyether ether ketone. By forming the liner from polyaryletherketone, sliding properties comparable to PTFE can be provided in the interior of the liner.

The invention discloses a medical-grade PEEK composite material for 3D printing and a preparation method of the medical-grade PEEK composite material, relates to the technical field of 3D printing, and solves the problem of low biological activity of an existing PEEK material. The medical-grade PEEK composite material is prepared from the following raw materials in parts by weight: 80-95 parts of a polyether-ether-ketone matrix, 5-15 parts of a bioactive filler, 0.5-5 parts of an interface modifier and 0.1-3 parts of a heat conduction and nucleation enhancer, the bioactive filler comprises nano-hydroxyapatite and bioactive glass in a weight ratio of (1-5): (5-1). The natural bone environment can be effectively simulated, the biological activity of the composite material is improved, and cell adhesion and proliferation are promoted, so that the cell proliferation rate is increased, and the antibacterial effect and the mechanical property of the composite material can be effectively improved.

The invention discloses a wear-resistant polymer composite material replacing a graphite copper bush and a preparation method thereof.The wear-resistant polymer composite material comprises, by mass, 60%-80% of polyether-ether-ketone, 5%-20% of red copper powder, 5%-15% of aramid fiber, 3%-10% of polybenzoate, 3%-10% of polytetrafluoroethylene, 2%-8% of graphite, 0.5%-1% of compatilizer and 0.5%-1% of flow modifier. The sum of the mass percentages of the components is 100%. Compared with pure polyether-ether-ketone, the wear rate of the wear-resistant polymer composite material prepared by the invention is reduced by 30-50%, the heat-conducting property is improved by 50% or more, and the wear-resistant polymer composite material has the advantages of light weight, self-lubrication, high wear resistance, antistatic property, noise reduction and the like, can replace a traditional graphite copper sleeve, and is suitable for various industrial scenes.

This invention discloses a bandgap-tunable vibration-damping metamaterial containing resonant units, belonging to the field of vibration control technology. The invention consists of an array of cells with localized resonant characteristics arranged in a specific direction. Each cell is a negative Poisson's ratio combined with a spring oscillator structure, mainly composed of an outer negative Poisson's ratio structure frame, an S-shaped spring structure at the connection point, a cylindrical oscillator, and a ring. The cylindrical oscillator is embedded within the ring at the center of the negative Poisson's ratio combined with the spring oscillator structure and connected to the symmetrical centerline of the outer negative Poisson's ratio structure frame via the S-shaped spring. The internal S-shaped spring structure and the ring structure are rigidly connected. The ring structure and the cylindrical oscillator are fitted with an interference fit. The outer negative Poisson's ratio structure frame is made of low-density materials such as polyetheretherketone, polylactic acid, and aluminum alloy, while the cylindrical oscillator is made of high-density pure tungsten. This invention inhibits wave propagation along a predetermined direction within the bandgap range, achieving vibration reduction.