118 results about "Piezoelectric polymer" patented technology

The invention provides a preparation method of a photoresponse thin film material, the photoresponse thin film material and an ultraviolet light monitoring device and system.The method comprises the steps that 4, 4 '-dihydroxy hexyloxy azobenzene is added into a polymer formed by polymerizing a dihydroxy oligomer and a diisocyanate-based monomer, polyurethane containing azobenzene groups is obtained, and the polyurethane containing the azobenzene groups is added into the polymer to obtain the photoresponse thin film material. The preparation method comprises the following steps: dissolving polyurethane and a piezoelectric polymer in a high-boiling-point solvent to obtain an electrospinning solution, and carrying out electrostatic spinning by adopting the electrospinning solution to obtain the photoresponse film material. According to the invention, 4, 4 '-dihydroxy hexyloxy azobenzene containing six-carbon spacer is used as a chain extender and is added into a polymer of a dihydroxy oligomer and a diisocyanate-based monomer to obtain azobenzene group-containing ultraviolet light response polyurethane, and then the polyurethane and a piezoelectric polymer are combined, so that the ultraviolet light response performance of the piezoelectric polymer is improved. The photoresponse thin film material with better flexibility, better mechanical property and good ultraviolet response is prepared, the preparation process of the photoresponse thin film material is simple, and the preparation cost is low.

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 belongs to the field of flexible piezoelectric polymer materials, and discloses a polyvinylidene fluoride based ferroelectric polymer and a preparation method thereof. The preparation method comprises the following steps: (1) adding an inorganic alkaline reagent into a polyvinylidene fluoride-trifluoroethylene ferroelectric polymer solution, carrying out dehydrofluorination and nucleophilic addition-elimination reaction to generate a polymer with an enol structure, and then washing, precipitating and purifying a reaction product; and (2) re-dissolving by using an organic solvent, then forming a film by using a tape casting method, and carrying out ketone-enol tautomerization reaction in the film forming process of the tape casting method to finally prepare the polyvinylidene fluoride based ferroelectric polymer film. According to the effective modification and preparation method disclosed by the invention, an enol structure is promoted to be converted into a more stable ketone structure through a ketone-enol tautomerization reaction by utilizing a high-temperature environment in a film forming process, so that C = O double bonds are introduced into a polymer chain, and the piezoelectric property of the polymer is remarkably enhanced.

The invention discloses a flexible pressure sensor based on a metal oxide thin film transistor and a preparation method and application thereof. The flexible pressure sensor based on the metal oxide thin film transistor comprises a flexible substrate, a gate electrode layer, a gate dielectric layer, a metal oxide channel layer, a source electrode, a drain electrode and a piezoelectric layer, the piezoelectric layer comprises a piezoelectric polymer, ZnO nanoparticles and MXene nanosheets, and the surface of the piezoelectric layer is provided with a convex micro-nano structure. The flexible pressure sensor based on the metal oxide thin film transistor has the advantages of excellent electrical properties, good flexibility, high sensitivity, easy integration, simple preparation process and low cost, is suitable for the production of large-scale sensor arrays, and has very wide application prospects in the fields of flexible touch screens, human-computer interaction, electronic skin and the like.

The utility model discloses piezoelectric polymer crystallization equipment which comprises an equipment body and a high-frequency power supply, an upper polar plate is arranged above the equipment body; a lower polar plate is arranged below the equipment body; one end of the high-frequency power supply is electrically connected to the upper polar plate, and the other end of the high-frequency power supply is electrically connected to the lower polar plate; a polymer solution is arranged in the equipment body; the high-frequency heating PVDF piezoelectric polymer solvent crystallization equipment has the advantages of uniform temperature, high heating speed, convenience in reaction control, heating selectivity and the like, dipoles in the solvent are oriented and polarized under the action of a high-frequency alternating electric field to form a temperature gradient (high inside and low outside), so that the solvent is promoted to be volatilized and dried from inside to outside, and meanwhile, vacuum high-frequency heating can be matched, so that the crystallization efficiency is improved. The boiling point of the solvent can be reduced within a certain vacuum degree, and meanwhile, in a negative pressure environment, the pressure in the solution is greater than the surface, so that the diffusion speed of the solvent from inside to outside is accelerated.

The invention discloses preparation of a two-dimensional piezoelectric semiconductor doped piezoelectric polymer material and application of the two-dimensional piezoelectric semiconductor doped piezoelectric polymer material to degradation of perfluorinated compounds, a method comprises the steps that a simple physical method is used for doping a two-dimensional piezoelectric semiconductor into a piezoelectric polymer to enhance electron transfer in a polymer matrix, and the synthesis method is simple. Piezoelectric catalysis is driven by ultrasonic mechanical force to realize degradation of perfluorinated compound pollutants in water. The two-dimensional piezoelectric semiconductor doped piezoelectric polymer material prepared by the method has relatively high catalytic activity, shows excellent degradation capacity on perfluorinated compound pollutants (perfluorooctanoic acid, perfluorooctanoic acid, perfluorodecyl acid and perfluorododecyl carboxylic acid), is low in energy consumption and easy to recycle, and avoids secondary pollution.

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 belongs to the field of polymer functional materials and polymer processing, and particularly relates to a flexible sensing film with high voltage output performance and a preparation method of the flexible sensing film. The flexible piezoelectric polymer sensing film is prepared by adopting a flash annealing method, the beta crystal content and the piezoelectric output performance of the obtained piezoelectric polymer film are remarkably improved in a short time, and the flexible piezoelectric polymer sensing film has good application potential.

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 invention belongs to the technical field of bridge joint filling materials, and particularly relates to a room-temperature shape memory piezoelectric polymer composite bridge joint filling material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, respectively preparing an epoxy resin precursor and a thermoplastic polyurethane prepolymer with reversible dynamic disulfide covalent bonds, and then mixing the epoxy resin precursor with the thermoplastic polyurethane prepolymer to obtain polyurethane-epoxy resin with an interpenetrating network structure; the invention also prepares a piezoelectric ceramic material with piezoelectric property, and the piezoelectric ceramic material, the polyurethane-epoxy resin and the conductive agent are mixed, poured and cured to obtain the room-temperature shape memory piezoelectric polymer composite bridge joint filling material. The obtained room-temperature shape memory piezoelectric polymer composite bridge joint filling material has a room-temperature shape memory characteristic, and shape memory recovery of the material at room temperature is promoted.

A piezoelectric composite material is formed from a cellulosic material and an inorganic piezoelectric material dispersed in a piezoelectric polymer. The piezoelectric polymer of the composite material has a dielectric constant of from 10 or more. A method of making a piezoelectric is also disclosed wherein a matrix of a cellulosic material, an inorganic piezoelectric material, and a piezoelectric polymer material is formed. The matrix is formed into a piezoelectric composite body.

The invention belongs to the related technical field of composite flexible piezoelectric materials, and discloses a piezoelectric polymer film material, a preparation method thereof and a piezoelectric sensor. The preparation method comprises the following steps: S1, selecting a polyvinylidene fluoride non-relaxor ferroelectric polymer and a polyvinylidene fluoride relaxor ferroelectric polymer, the preparation method comprises the following steps: respectively dissolving a polyvinylidene fluoride based non-relaxor ferroelectric polymer and a polyvinylidene fluoride based relaxor ferroelectric polymer in an organic solvent to obtain two polymer solutions; s2, blending and stirring the two polymer solutions to obtain a mixed solution; s3, the mixed solution is poured into a mold, the solvent is dried, and the piezoelectric polymer membrane material is prepared. The relaxor ferroelectric polymer is introduced into the non-relaxor ferroelectric polymer through physical blending design, the problem that the piezoelectric coefficient of a traditional vinylidene fluoride polymer is remarkably reduced in a high-temperature environment is solved, the prepared membrane material does not need complex chemical modification, the process is simple, the cost is low, and good operability is achieved.

An endovascular device may include (a) a proximal end, configured for communicating a pressure signal to a receiver; (b) a distal end comprising a pressure sensor that is based on (i) a piezoelectric polymer layer; and (ii) first and second electrodes, electrically insulated from each other, each contacting the piezoelectric polymer layer, wherein the pressure sensor derives the pressure signal from the first and second electrodes; and (c) a device body, which provides one or more conductors to carry the pressure signal from the distal end to the proximal end.

A mobile device includes one or more piezoelectric polymer layers underlying a display. The one or more piezoelectric polymer layers may be electrically driven to operate in either a d33 stretching mode or a d31 bending mode. The mobile device functions as an ultrasonic sensor in the d33 stretching mode and as an audio speaker / microphone or a proximity sensor in the d31 bending mode. The piezoelectric polymer layer operating in the d31 bending mode may be directly mechanically coupled to a display, indirectly mechanically coupled to the display and underlying an ultrasonic sensor stack, or integrated in the ultrasonic sensor stack. Signal performance of the piezoelectric polymer layer operating in the d31 bending mode may be enhanced or modulated by having a larger area, multiple layers, bi-pole or uni-pole driving with multiple layers, one or more stiff adhesives, a spacer layer, one or more mass features, a thin TFT layer, a thick piezoelectric polymer layer, or combinations thereof.

The invention relates to a layout design method of a high-frequency imaging sonar array. The layout design method comprises the following steps of: integrally designing a whole piezoelectric polymer film of which the piezoelectric property is regionally designed, a pre-amplification circuit, an electrode structure and a supporting structure; wherein the electrode structure comprises an electrode and an electrode plate; the supporting structure comprises a cylinder and an end cover; the circuit board is made of a whole PCB, a preset number of holes are distributed in the circuit board, and an electrode is embedded in the corner of one side of the circuit board. The design defects of a traditional piezoelectric ceramic sonar array are effectively avoided, meanwhile, the non-sensing part of the polymer film does not participate in pickup of sound signals, and crosstalk of a transverse mode in the working process of the hydrophone is avoided.

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 provides a preparation method of a light response thin film material, the light response thin film material, an ultraviolet light monitoring device and a system. The method comprises the following steps: adding 4,4'-dihydroxyhexyloxy azobenzene into a polymer obtained by polymerization of a dihydroxy oligomer and a diisocyanate-based monomer to obtain polyurethane containing an azobenzene group; dissolving the polyurethane and a piezoelectric polymer in a high-boiling-point solvent to obtain an electrospinning solution; and performing electrospinning on the electrospinning solution to obtain the light response thin film material. The 4,4'-dihydroxyhexyloxy azobenzene containing a six-carbon spacer is added as a chain extender into the polymer of the dihydroxy oligomer and the diisocyanate-based monomer to obtain the ultraviolet light response polyurethane containing the azobenzene group. Furthermore, the light response thin film material with better flexibility, better mechanical properties and good ultraviolet light response can be prepared by combining the polyurethane and the piezoelectric polymer. The preparation process of the light response thin film material is simple, and the preparation cost is low.

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 composition comprising a piezoelectric polymer and a binder, the composition being capable of being printed to form a haptic component during a process for forming an electronic device.

The invention discloses a preparation method of a piezoelectric fiber membrane, the piezoelectric fiber membrane and application, the method comprises the following steps: adding polyethylene glycol into a dipole aprotic solvent, and stirring until the polyethylene glycol is completely dissolved to obtain a first mixed solution; sequentially adding a polyurethane material and a piezoelectric polymer into the first mixed solution, and stirring at a first preset temperature for a first preset duration to obtain a second mixed solution; adding the second mixed solution into an electrostatic spinning device for electrostatic spinning to obtain a spinning membrane; the spinning membrane is sequentially subjected to drying, soaking, cleaning and drying treatment, and the piezoelectric fiber membrane is obtained. The prepared piezoelectric fiber membrane has good piezoelectric performance, can enhance the guiding effect on piezoelectric charges, and can improve the scale inhibition effect when being used as a filter membrane.

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 invention discloses a piezoelectric type mechanoluminescence self-energized optical fiber pressure sensor and a preparation method thereof. The sensor comprises a coupling optical fiber, a sensing layer and a pressure-resistant protection layer, the coupling optical fiber comprises a fiber core and a cladding and is used for guiding a fluorescence signal, the cladding wraps the fiber core, and the fiber core is made of a hard polymer; one end of the coupling optical fiber is of a conical structure; the sensing layer wraps the outer side of the conical structure of the coupling optical fiber, the sensing layer comprises a piezoelectric type mechanoluminescent material and a piezoelectric type polymer, and the piezoelectric type mechanoluminescent material is dispersed in the piezoelectric type polymer; and the pressure-resistant protective layer wraps the outer layer of the sensing layer and is a hard polymer. The optical fiber sensor prepared by compounding the piezoelectric mechanoluminescent material and the piezoelectric polymer realizes self-energized sensing, can stably operate under a large pressure detection condition, realizes an in-situ real-time pressure sensing function, and has important application value in the fields of scientific research, industrial production, building safety and the like.

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.

A method for manufacturing a toothbrush filament, and the manufactured toothbrush filament and toothbrush, which includes melt extrusion of a piezoelectric polymer and undergoes corona polarization and annealing processes, thereby making the piezoelectric constant of the toothbrush filament in a stationary state 0.4 pC / N or more, and having a certain stably present polarization charge on its surface, and utilizing the antibacterial action mechanism based on physical electrical stimulation, can effectively improve the problem of mass bacterial proliferation on the toothbrush filament in a stationary state, thereby improving the antibacterial performance of the toothbrush filament.

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.