54 results about "Piezoelectric polymer" patented technology

The invention discloses an injectable material for promoting bone regeneration through piezoelectric and conductive integrated nanofiber hydrogel with ultrasonic response and a preparation method of the injectable material. The injectable material is composed of piezoelectric and conductive nanofibers and hydrogel. Wherein the piezoelectric conductive nanofiber is prepared from an inorganic piezoelectric material and a piezoelectric polymer through electrostatic spinning, or is prepared from an inorganic / organic composite piezoelectric material and a biological material with conductive performance through electrostatic spinning.

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 invention discloses a polyaryletherketone composite implant material and a preparation method and application thereof, and belongs to the technical field of medical materials.The preparation method of the polyaryletherketone composite implant material comprises the following steps that a carbon fiber reinforced polyaryletherketone substrate with the surface provided with a groove structure and conductivity is prepared; based on a precipitation method, a calcium compound, a magnesium compound and a phosphoric acid aqueous solution are used for preparing white calcium stone; the preparation method comprises the following steps: carrying out surface modification on the white calcium phosphate by utilizing polydopamine, so as to obtain modified white calcium phosphate; adding the modified white calcium phosphate and a degradable piezoelectric polymer into a solvent, and mixing to obtain a mixed solution; and coating a carbon fiber reinforced polyaryletherketone substrate with the mixed solution, and performing drying and annealing treatment to form a coating, thereby obtaining the polyaryletherketone composite implant material. According to the invention, the degradable piezoelectric composite coating doped with the white phosphorus calcium stone, which has piezoelectric characteristics and ion release capability, is constructed, so that double biomimetic effects of an electric signal and a chemical signal in a bone healing microenvironment are realized.

The application discloses a kind of high-temperature-resistant bifunctional nanogenerator materials and preparation method and application thereof, belong to high-temperature-resistant sensitive material development field;Solve the poor flexibility, single function and lead toxicity of traditional high-temperature piezoelectric sensor and other problems;The application is that piezoelectric polymer polyacrylonitrile and anhydrous acetate are fully mixed in organic solvent and pre-cyclization, then the method of electrospinning is used to prepare flexible nanofiber membrane, and the composite fiber membrane is heat treated, and nanogenerator material is prepared;The nanogenerator material described in the application can work continuously in an environment higher than 450 DEG C, has pyroelectric function, has dual sensitivity to force and heat, and has good flexibility.The preparation method is simple, low cost, environment-friendly and excellent in electrical output performance, and is expected to have good application prospect in the field of force and heat sensitive signal monitoring and sensing in extreme high-temperature environment.

The application discloses a nanofiber and piezoelectric polymer composite solid-state electrolyte membrane and a preparation method and a secondary battery thereof, relates to the technical field of batteries, and the raw materials of the solid-state electrolyte membrane include nanofibers and a piezoelectric polymer, the raw materials of the piezoelectric polymer include a piezoelectric polymer, a zinc salt and an ionic liquid; the nanofibers are used in the form of a nanofiber membrane as a framework, and the piezoelectric polymer is arranged on the nanofiber membrane. The preparation method comprises the following steps: preparing a spinning liquid by using a polymer material, performing spinning treatment, and obtaining a nanofiber membrane; dissolving the piezoelectric polymer, the zinc salt and the ionic liquid, uniformly laying the piezoelectric polymer, the zinc salt and the ionic liquid on the nanofiber membrane, and drying, and the solid-state electrolyte membrane is obtained. The secondary battery comprises the solid-state electrolyte membrane. The nanofiber reinforced solid-state electrolyte membrane realizes uniform distribution of current and electric field, provides ideal conditions for zinc deposition, the piezoelectric polymer is injected as an ion transmission medium, the zinc salt and the ionic liquid are introduced, and the ionic conductivity is improved.

The application discloses an interdigital electrode type piezoelectric composite energy collector and a preparation method and application thereof. After piezoelectric ceramic nanowires and piezoelectric polymer powder are fully mixed, the piezoelectric composite material with the piezoelectric ceramic nanowires arranged in a direction is obtained through 3D printing, and an interdigital electrode is loaded on the surface of the piezoelectric composite material, the positive and negative electrodes are connected, and a film is coated, and the energy collector is obtained. The energy collector is based on the synergistic effect among the piezoelectric ceramic nanowires, the piezoelectric polymer powder and the interdigital electrode, the vibration energy is fully absorbed by controlling the directional arrangement of the piezoelectric ceramic nanowires, and the output power of the energy absorber is greatly provided. The wearable energy collector obtained by using the piezoelectric composite material has the advantages of simple structure, stable performance and high output power, and can fully absorb the vibration energy generated in the human motion process. The maximum output voltage can reach 17V under the pressure of 180KPa, and the maximum load power can reach 5.6muW.

A polymer composite having piezoelectric properties that can be formed for flexible and / or thin film applications, where the polymer composite includes a polymer matrix and a piezoelectric ceramic filler embedded in the polymer matrix. The polymer matrix can include at least two polymers: a first polymer and a second polymer. The first polymer can be a fluorinated polymer and the second polymer can be compatible with the first polymer and have a dielectric constant less than about 20. The piezoelectric ceramic filler can be lithium-doped potassium sodium niobate (KNLN) and can be about 40-70 vol% of the polymer composite. The remaining 30-60 vol% can be the polymer matrix, which itself can be about 5-20 wt% of the second polymer and 80-95 wt% of the fluorinated polymer.

A method of activating a piezoelectric neuroconduit guide scaffold including a plurality of aligned piezoelectric polymer nanofibers, the method including mechanically stimulating the piezoelectric neuroconduit guide scaffold with hydro-acoustic waves or shockwaves to remotely activate a piezoelectric effect of the nanofibrous scaffolds that induces a mechano-electrical stimulus on neural cells cultured on the scaffold, wherein the mechano-electrical stimulus promotes nerve fiber outgrowth from the neuronal cells. Some aspects relate to seeding individual components of neural tissues on the piezoelectric neuroconduit guide scaffold, wherein the hydro-acoustic stimulation induces neural tissue formation. In other aspects, the piezoelectric neuroconduit guide scaffold is implanted in a damaged neural tissue, wherein stimulating the piezoelectric neuroconduit guide scaffold by the application of shockwaves promotes nerve fiber outgrowth that bridges a nerve gap to induce nerve regeneration or reinnervation of the damaged neural tissue.

The application discloses a kind of polyaryletherketone composite implant materials and preparation method and application, and belongs to medical material technical field, wherein, the preparation method of the polyaryletherketone composite implant material includes the following steps: preparation surface has recess structure and the carbon fiber reinforced polyaryletherketone base of conductivity;Based on precipitation method, white brushite is prepared using calcium compound, magnesium compound and phosphoric acid aqueous solution;White brushite is surface modified using polydopamine, to obtain modified white brushite;Modified white brushite is mixed with degradable piezoelectric polymer into solvent, to obtain mixed solution;Mixed solution is coated on carbon fiber reinforced polyaryletherketone base, after drying, annealing treatment, form coating, to obtain polyaryletherketone composite implant material.The application constructs white brushite doped degradable piezoelectric composite coating with piezoelectric characteristics and ion release capacity simultaneously, realizes the dual bionics of electric signal and chemical signal in bone healing microenvironment.

The invention belongs to the technical field of solar-blind ultraviolet light detection materials, and relates to a full-flexible solar-blind ultraviolet light detection material and a preparation method and application thereof, and the full-flexible solar-blind ultraviolet light detection material comprises a down-conversion luminescent material, an azobenzene polymer and a piezoelectric polymer. The excitation-emission characteristic of the rare earth doped down-conversion particles is utilized, a light absorption window of azobenzene elements and the wavelength conversion characteristic of the down-conversion light-emitting particles are accurately matched, high-energy solar-blind ultraviolet light is converted into low-energy long-wave ultraviolet light capable of enabling azobenzene molecules to generate photoisomerization, an azobenzene polymer is driven to generate photoisomerization, and the light-emitting efficiency of the azobenzene polymer is improved. The film fiber network is driven to microscopically shrink and the piezoelectric polymer is excited to output an electric signal; the operation is simple and convenient, the fiber film composite material with a microstructure can be continuously manufactured in a large area, and the preparation of the large-area, fast-response and high-stability intrinsic flexible solar-blind ultraviolet detection material and the device thereof is realized.

The invention relates to the technical field of composite material preparation, and particularly discloses a preparation method of a microchip piezoelectric yarn reinforced resin-based composite material and the material. Preparing a piezoelectric polymer fiber net on the surface of the silver-plated aramid fiber core layer by taking a piezoelectric polymer as a spinning raw material to obtain a piezoelectric core-spun yarn; coating the surface of the piezoelectric core-spun yarn with silver-plated aramid fiber in a weaving manner to obtain initial piezoelectric yarn; melting polypropylene, and uniformly coating the surface of the initial piezoelectric yarn with the molten polypropylene to obtain a target piezoelectric yarn; the target piezoelectric yarn is connected with a microchip, and microchip fibers are obtained; the microchip fibers and the resin matrix are integrated through a three-dimensional weaving technology, and the microchip piezoelectric yarn reinforced resin matrix composite material is obtained. Based on the scheme, the prepared microchip piezoelectric yarn reinforced resin-based composite material has the characteristics of high strength, no external power supply, long-distance identification and wireless communication.

A negative electrode plate includes a negative current collector, a lithium metal negative electrode, and a negative electrode framework. A polarization electric field exists inside the negative electrode framework. A direction of the polarization electric field is directed from a surface of the negative electrode to the negative current collector. A material of the negative electrode framework includes at least one of a piezoelectric polymer, piezoelectric ceramic, or piezoelectric monocrystal. The negative electrode plate can control lithium deposition sites, effectively suppress the growth of lithium dendrites, effectively mitigate volume expansion of the electrochemical device, and further improve cycle performance of the electrochemical device.

The invention belongs to the field of flexible piezoelectric polymer materials, and discloses a ferroelectric polymer and a method for preparing the ferroelectric polymer through crosslinking modification. The preparation method comprises the following steps: (1) dissolving a polyvinylidene fluoride-based ferroelectric polymer in an organic solvent, adding a cross-linking agent with at least two NH2 groups, uniformly dispersing, then placing the solution in a mold, and drying the solvent to obtain a polymer membrane material; and (2) heating the polymer membrane material to initiate nucleophilic addition reaction-elimination dehydrofluorination reaction for chemical crosslinking to obtain the C = N covalent bond crosslinked polyvinylidene fluoride based ferroelectric polymer membrane material. According to the invention, the polyvinylidene fluoride-based ferroelectric polymer and the diamine cross-linking reagent are subjected to chemical cross-linking, and a local molecular conformation disordered structure is introduced, so that the induced piezoelectric coefficient d33 is remarkably improved.

A piezoelectric composite material is disclosed that includes (a) an olefin copolymer and (b) a plurality of piezoelectric filler particles. The plurality of piezoelectric filler particles can be dispersed in the olefin copolymer. Also disclosed are films that include such piezoelectric composite materials and methods for preparing such films.

The present application relates to the sewage treatment technical field, specifically relates to a kind of preparation and application in water purification bacteriostasis of nitrogen-rich carbide piezoelectric composite material.The present application is coupled by high molecular piezoelectric polymer and nitrogen-rich carbide, and modified piezoelectric composite material with high piezoelectric catalytic activity is formed, and the efficient degradation of various organic pollutants in water is realized by driving force induction piezoelectric effect, and has excellent bacteriostatic performance.The preparation process in the present application is simple, green, low cost, material mechanical strength is high, degradation process is free of secondary pollution, easy to mass production, the method can effectively solve water pollution problem, help ecological environment protection, and escort for human health.

The invention relates to a piezoelectric-photocatalytic ferroelectric heterojunction material, a porous composite film and a preparation method, the piezoelectric-photocatalytic ferroelectric heterojunction material comprises a Ba < 0.85 > Ca < 0.15 > Zr < 0.1 > Ti < 0.9 > O < 3 > / BiOX ferroelectric II-type heterojunction composite material, the Ba < 0.85 > Ca < 0.15 > Zr < 0.1 > Ti < 0.9 > O < 3 > and BiOX are combined through a II-type heterojunction, and X is selected from any one of Cl and Br. The porous composite membrane comprises a porous composite membrane which is formed by a conductive organic polymer, a Ba < 0.85 > Ca < 0.15 > Zr < 0.1 > Ti < 0.9 > O < 3 > / BiOX ferroelectric II type heterojunction composite material and a piezoelectric polymer. The porous composite membrane can also comprise conductive nanoparticles. According to the invention, Ba0. 85Ca0. 15Zr0. 1Ti0. 9O3 and BiOX are combined through a type II heterojunction to form the composite material, so that the coupling effect of piezoelectric response and photocatalytic activity can be realized; the polymer-based porous composite membrane formed by taking the composite material as an inorganic filler can realize efficient degradation of organic pollutants; and the conductive network of the composite film can be further optimized by adding the conductive nanoparticles. The composite material prepared by the invention can efficiently degrade organic pollutants in water by utilizing the natural environment.

A method for producing a sheet having nanofibers that contain a piezoelectric polymer material. The method including dissolving a piezoelectric polymer material into a solvent so as to prepare a spinning solution; preheating a target board before nanofibers are formed by electrospinning the spinning solution; and, after the heating of the target board, receiving the nanofibers formed by electrospinning onto the heated target board so as to form the nanofibers into a sheet on the heated target board.

This invention discloses a method for preparing a flexible film for treating infected bone defects, belonging to the fields of composite materials, piezoelectric materials, and electrospinning technology. The flexible film of this invention is a poly-L-lactic acid (PLLA) / black phosphorus nanosheets (BPNSs) composite film. PLLA is used as the substrate, and two-dimensional layered semiconductors with piezoelectric effect, BPNSs, are used as fillers. The composite film is prepared by electrospinning. The composite film has an asymmetric micro-interface, forming a structure in which PLLA fibers encapsulate BPNSs. BPNSs are in situ confined and coated within PLLA spinning fibers to construct a two-dimensional narrow bandgap semiconductor / flexible piezoelectric polymer composite film.

Disclosed in the present invention are a novel artificial bone based on promoting neurovascular regeneration and a preparation method. The novel artificial bone comprises an artificial bone. The artificial bone is composed of β-tricalcium phosphate, polylactic acid-glycolic acid, a nano magnesium-based powder, and a piezoelectric polymer. The mass ratio of β-tricalcium phosphate to polylactic acid-glycolic acid in the artificial bone is 1:0-1:10. The nano magnesium-based powder and the piezoelectric polymer are mixed to form a piezoelectric composite solution, and the mass ratio of the nano magnesium-based powder to the piezoelectric polymer in the piezoelectric composite solution is 1:1-1:20, such that the surface of the artificial bone is modified by means of the piezoelectric composite solution, thereby forming a piezoelectric coating on the surface of the artificial bone; in this way, when the artificial bone is implanted into a bone defect site and is subject to stress, a charge and potential difference are generated. The present invention not only enhances the strength of the artificial bone, but also promotes the degradation of the artificial bone, stimulates local neurovascular regeneration, promotes the formation of new bone, and achieves the purpose of repairing osteonecrosis and bone defects.

A moldable polymer composite material with piezoelectric properties for flexible and / or thin-film applications, wherein the polymer composite material comprises a polymer matrix and a piezoelectric ceramic filler embedded in the polymer matrix. The polymer matrix may comprise at least two polymers: a first polymer and a second polymer. The first polymer may be a fluorinated polymer, and the second polymer may be compatible with the first polymer and have a dielectric constant less than about 20. The piezoelectric ceramic filler may be a lead-free ceramic filler such as barium titanate, and may comprise about 40-70 vol% of the polymer composite material. The remaining 30-60 vol% may comprise the polymer matrix, which itself may comprise about 5-20 wt% of the second polymer and 80-95 wt% of the fluorinated polymer.

The invention discloses a piezoelectric suture line, a preparation method thereof and a piezoelectric suture line system. The piezoelectric suture line comprises a shell and a core material, the shell is filled with the core material, the shell is of a tubular structure and comprises a plurality of fibers, the fibers are arranged in the first direction, a torsion angle exists between the fibers and the second direction, the first direction is the circumferential direction of the shell, and the second direction is the axis direction of the shell; the materials of the cellosilk comprise a degradable piezoelectric polymer and an antioxidant, and the core material comprises conductive hydrogel. According to the piezoelectric suture line, the suture line is designed to be of the core sheath structure comprising the shell and the core material, and the piezoelectric signal generated by the shell is transmitted through the core material and then can be used for being connected with the information processing module connected with the outside to achieve real-time monitoring of the wound surface state; the piezoelectric suture line material provided by the invention has the characteristics of biodegradability, flexibility, biological safety and the like.

The invention discloses a polymer nanofiber preparation method and a hydraulic pipeline micro-leakage detection method, and relates to the technical field of material science and sensor engineering. The method comprises the following steps: mixing an ionic monomer, an electronic monomer, a conductive additive and a solvent in proportion to obtain a spinning solution; wherein the molar ratio of the ionic monomer to the electronic monomer is (1: 1)-(10: 1), and the conductive additive accounts for 0.1-5% of the total mass of the spinning solution; placing the spinning solution in an electrospinning device equipped with an alternating-current electric field source, and regulating and controlling the electric field intensity and frequency of the electrospinning device and the flow velocity of the spinning solution to enable the monomer molecules to be directionally arranged and to be subjected to in-situ polymerization reaction so as to obtain piezoelectric polymer nanofibers with the diameter range of 50-500 nm; the piezoelectric polymer nanofiber is washed and dried or subjected to heat treatment, and the polymer nanofiber is obtained.

The application discloses a repairing product containing biodegradable piezoelectric nanofiber membranes and a preparation method and application thereof. The preparation process is simple, and raw materials are low in price. Compared with pure fiber membranes without doped nanoparticles, piezoelectric polymers in the fiber membranes doped with nanoparticles synergistically promote osteogenesis, and still have biodegradability, meet mechanical performance, and do not affect the piezoelectric performance of the nanofiber membranes.

This invention relates to a single-layer multifunctional decoupled hydrogel-based sensor and its fabrication method, belonging to the field of hydrogel sensor technology. The fabrication method includes: dissolving a hydrogel matrix in a solvent and stirring until homogeneous to obtain mixture one; adding a piezoelectric polymer to mixture one and heating and stirring until completely dissolved to obtain mixture two; subjecting mixture two to freeze-thaw cycles to obtain a hydrogel; and immersing the hydrogel in a redox ion pair solution for at least 24 hours to obtain a single-layer multifunctional decoupled hydrogel-based sensor. This invention overcomes the shortcomings of cumbersome fabrication processes and insufficient mechanical stability, achieving simultaneous high-sensitivity sensing of pressure, temperature, and strain signals with a single-layer thin-film structure and completing effective functional decoupling. Furthermore, the sensor possesses the characteristics of simple fabrication, low cost, excellent flexibility, and high stability, making it suitable for practical applications in wearable electronics, electronic skin, and other fields.

The invention belongs to the technical field of medical supplies, and particularly relates to an antibacterial wound healing promoting dressing and a preparation method thereof. The antibacterial wound healing promoting dressing sequentially comprises a piezoelectric polymer layer, an adsorption layer and a super-hydrophobic layer from bottom to top, the piezoelectric polymer layer is formed by covering a conductive layer on the surface of a polymer, and a hole array is distributed on the conductive layer; in the hole array, the distance between every two adjacent holes ranges from 0.5 mm to 2 mm. The total area accounts for 5%-25% of the area of the antibacterial wound healing promoting dressing. The piezoelectric effect of the piezoelectric polymer is utilized, electrical stimulation is generated through normal movement of a human body or external contact, cell growth at the wound is promoted, and wound healing is further promoted.

The invention discloses a piezoelectric dressing which comprises a piezoelectric polymer with the mass volume ratio of 6-12%, a high-molecular polymer with the mass volume ratio of 7-10% and a hydrogel fiber membrane with the mass volume ratio of 1-3%. The invention also provides the dressing prepared by adopting an electrostatic spinning method. The preparation method has the advantages that the finally prepared dressing can autonomously generate therapeutic electrical stimulation, actively control infection and play an antibacterial role at the same time, and mark normal form transformation of wound treatment from passive dressing to self-energized bioelectronic treatment.

The application relates to the technical field of organic functional material preparation, and provides a high piezoelectricity low modulus polymer alloy and a preparation method, the preparation method comprises the following steps: S1, dissolving dimers P(VDF-TrFE) and trimers P(VDF-TrFE-CFE) with different proportions into a polar solvent to form a mixed solution; S2, forming a thin film of the mixed solution on a substrate, crystallizing and annealing to obtain a piezoelectric polymer alloy; and S3, polarizing the piezoelectric polymer alloy by using a strong electric field, thereby obtaining the high piezoelectricity low modulus polymer alloy. The two organic polymer molecules are compatible at the molecular level, the crystallization temperature and the annealing temperature are controlled, the molecular chain conformation and the phase structure are regulated by using components and a polarization electric field, the morphotropic phase boundary is induced, the high piezoelectricity and the low Young's modulus of the polymer alloy are realized, and the foundation is laid for constructing high-performance piezoelectric devices. The material system used by the application is simple and controllable, the manufacturing cost is low, and the application has great commercial value and practical significance.

This invention discloses an anisotropic piezoelectric film for nerve repair and its preparation method, belonging to the field of biomedical materials technology. The anisotropic piezoelectric film for nerve repair provided by this invention has a surface with parallel, periodically repeating wavy folds; the wavelength of the wavy folds is 30-50 μm, and the height difference between the peaks and troughs is 10-30 μm; the anisotropic piezoelectric film is an organic piezoelectric polymer film with a thickness of 5-100 μm. The anisotropic piezoelectric film for nerve repair provided by this invention has a regular structure and high orderliness and anisotropy, which can accurately simulate the parallel arrangement of nerve fiber bundles in vivo, exhibiting excellent biomimetic effects. This facilitates the bridging growth of new axons along the injured vertebral segment, avoiding disordered axonal growth.

The invention belongs to the technical field of piezoelectric high polymer materials, and particularly relates to a high-orientation beta crystal content polyvinylidene fluoride sheet and a processing method thereof. The processing method of the high-orientation beta crystal content polyvinylidene fluoride sheet comprises the following steps: drying polyvinylidene fluoride; the preparation method comprises the following steps: carrying out melt blending and granulation on polyvinylidene fluoride and a cationic surface active agent; and adding the blend granules into a solid extrusion die, heating to a melting temperature, keeping the temperature and pressure, shaping and cooling to an extrusion temperature of 110-160 DEG C, and replacing an extrusion port template for molding to obtain the high-orientation polyvinylidene fluoride sheet with the beta crystal content. The processing method of the high-orientation beta crystal content polyvinylidene fluoride sheet provided by the invention is simple in process flow, and the PVDF sheet processed by the method has high-orientation beta crystal content.