54 results about "Ferroelectric polymers" patented technology

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 blended relaxor ferroelectric polymer super-ion solid electrolyte and preparation and application thereof, the super-ion solid electrolyte comprises a polymer matrix, a lithium salt and a relaxor ferroelectric polymer, the mass ratio of the relaxor ferroelectric polymer to the polymer matrix is 1: 1-20, and the lithium salt accounts for 1-80 wt% of the total weight of the solid electrolyte. According to the super-ion solid electrolyte, the relaxor ferroelectric polymer is added to be combined with the polymer matrix, the relaxor ferroelectric polymer can regulate and control the crystal phase component and structure of the polymer matrix, the electrolyte is endowed with relaxor ferroelectric characteristics, the dielectric constant is improved, and dissolution of lithium salt in the polymer matrix is further promoted; lithium ions can be quickly conducted, and the conductivity of the electrolyte and the cycle performance of the battery are effectively improved, so that the solid electrolyte has relatively high mechanical strength, electrochemical stability, interfacial compatibility and room-temperature ionic conductivity.

The invention provides an elastomer preparation method and a flexible electronic device, and the preparation method comprises the steps: selecting a relaxation ferroelectric polymer as a matrix of an elastomer, the dielectric temperature spectrum of the relaxation ferroelectric polymer being greater than 20 DEG C; and carrying out covalent cross-linking treatment on the relaxation ferroelectric polymer and a preset cross-linking agent to obtain the elastomer. The rebound resilience and dielectric constant of the elastomer can be improved.

The invention discloses a ferroelectric composite fiber, a battery diaphragm, a battery piece, a lithium ion battery and a preparation method thereof, and belongs to the technical field of batteries. The ferroelectric composite fiber comprises a base membrane, and an organic ferroelectric polymer, inorganic ferroelectric nanoparticles and interface functional molecules which are loaded on the base membrane, the interface functional molecule is 1-azaphenol thiazine and / or a derivative thereof. In addition, the invention also provides a preparation method of the ferroelectric composite fiber. In addition, the invention also provides a battery diaphragm, a battery piece and a lithium ion battery. The ferroelectric composite fiber provided by the invention synchronously solves the two problems of ion transport kinetics and electrode interface stability in one-time film formation.

The application belongs to the technical field of flexible piezoelectric materials, and discloses a grafted ferroelectric polymer thin film with a high piezoelectric coefficient and a preparation method thereof, wherein the preparation method comprises the following steps: obtaining a polymer solution by selecting a polyvinylidene fluoride-based ferroelectric polymer; adding a grafting agent reagent to the polymer solution and uniformly mixing to obtain a mixed solution; uniformly casting the mixed solution on the surface of a glass substrate, heating in an oven to volatilize the solvent, then increasing the temperature of the oven to perform a grafting reaction to obtain a grafted thin film; after the oven is naturally cooled to room temperature, the grafted thin film is peeled off from the glass substrate, and a polarization process is adopted to obtain the grafted ferroelectric polymer thin film with a high piezoelectric coefficient. The polyvinylidene fluoride-based ferroelectric polymer is modified by grafting side chains, the relative stability of different molecular conformation energies in the ferroelectric polymer is regulated by grafting side chains in the polymer, the ferroelectric phase and the relaxor phase in the ferroelectric polymer are induced to compete with each other, and the piezoelectric coefficient of the material is significantly improved.

The present invention provides a ferroelectric polymer-based all-organic composite material for photothermal and photoelectric conversion, a preparation method, and its application. Ultra-small conjugated poly-Schiff base poly-4-amino-1-naphthaldehyde nanoparticles are mixed with ferroelectric PVDF-based polymers by solution blending and casting to simply prepare a nanocomposite film. The polarized composite film can generate strong photothermal and photoelectric conversion in a wide range of ultraviolet-visible-near infrared wavelengths, such as 100mW / cm 2 The 450nm light can produce a temperature change of about 23℃, and achieve an open circuit voltage of 42.4V and a capacitance of 501.5μAm by coupling the photothermal effect with the pyroelectric effect. ‑2 The composite material's photoelectric voltage of over 40V is significantly higher than the current mainstream semiconductor-based photoelectric voltage (~1V), which may be more conducive to the material's application in fields such as energy conversion and light detection.

A polymer network stabilised liquid crystal material (PN-LCs) having a ferroelectric liquid crystal phase is presented. Claimed is a process of aligning liquid crystal mixtures exhibiting a ferroelectric nematic or ferroelectric smectic A liquid-crystalline phase in a polar vertical state in relation to a boundary surface. The liquid crystal mixture is stabilized by a polymer network in a vertical alignment relative to the substrate planes enclosing the mixtures. In addition, the present invention relates to electric and electronic elements which contain the poled and aligned ferroelectric liquid crystal material according to the invention.

This invention provides a modified ferroelectric polymer composite film, its preparation method, and its applications, belonging to the field of piezoelectric composite material technology. The modified ferroelectric polymer composite film includes a ferroelectric polymer base film and a plurality of composite nanoparticles and multi-walled carbon nanotubes dispersed within the ferroelectric polymer base film. The composite nanoparticles have a core-shell structure, comprising a core and an inner shell layer and an outer shell layer sequentially surrounding the core. The core comprises a composite piezoelectric ceramic material composed of potassium sodium niobate and barium titanate, the inner shell layer comprises polydopamine, and the outer shell layer comprises MnO2. This invention fully utilizes the synergistic effect of the composite nanoparticles and multi-walled carbon nanotubes on the dielectric and piezoelectric properties of P(VDF-TrFE) materials, thereby preparing a composite material with high dielectric constant, low dielectric loss, and excellent piezoelectric properties to meet the stringent performance requirements of high-performance sensors and other application fields.

The invention provides a PVDF-based elastic ferroelectric material and a preparation method and application thereof, and relates to the technical field of ferroelectric materials. A ferroelectric crystal phase region of the PVDF-based elastic ferroelectric material is protected to the maximum extent, and a uniform three-dimensional elastic network structure formed by firm C-C bonds is constructed in an amorphous region by a PVDF-based ferroelectric polymer and a crosslinking sensitizer through radiation crosslinking; the PVDF-based elastic ferroelectric material has excellent ferroelectricity, great flexibility and elasticity, proper strength and excellent fatigue resistance at the same time. According to the preparation method of the PVDF-based elastic ferroelectric material, the technical bottlenecks of thermal crosslinking and photo-crosslinking are fundamentally overcome through a mild, pure and uniform radiation process, so that controllable preparation of the PVDF-based elastic ferroelectric material with excellent ferroelectricity, great flexibility and elasticity, proper strength and excellent fatigue resistance becomes reality; the preparation method is simple, efficient and high in universality, and is very suitable for large-scale industrial production.

The application discloses a ferroelectric material capable of continuously generating recoverable pseudo plastic deformation and a preparation method thereof, and the method comprises the following steps: mixing a ferroelectric polymer and N,N-dimethylformamide (DMF), stirring, pouring on a plate, drying, heat treatment, and obtaining a film; cutting the film into a strip and performing a "programming" process; after the "programming" is completed, a recovery process is performed: firstly, the temperature of the film is raised, and it can be observed that the shape of the film is gradually recovered to the initial shape through rising to different temperatures from a complex shape. The application provides a ferroelectric polymer capable of continuously generating recoverable pseudo plastic deformation under temperature regulation, and the preparation operability is high and the process is relatively simple; the shape of the ferroelectric polymer is regulated in a one-way heating process, and is expected to be applied to some switches which need to be opened in two or N sections or some places which need to release substances step by step.

The application discloses a ferroelectric local field enhanced polarized photoelectric detector and a preparation method thereof, and relates to the technical field of polarized photoelectric detection. The polarized photoelectric detector is observed from bottom to top and sequentially comprises a substrate, a two-dimensional semiconductor layer, a metal electrode pair and a ferroelectric film layer. The material of the two-dimensional semiconductor layer is black phosphorus. The material of the ferroelectric film layer is polyvinyl fluoride-based ferroelectric polymer. The metal electrode pair comprises a first metal electrode and a second metal electrode. A channel structure formed between the first metal electrode and the second metal electrode exposes part of the two-dimensional semiconductor layer. An in-plane PN junction is formed by part of the two-dimensional semiconductor layer exposed after the ferroelectric film layer is electrode polarized. The strong local field of the ferroelectric film changes the Seebeck coefficient and the conductivity of the black phosphorus in the armchair direction and the zigzag direction, enhances the photocurrent in the armchair direction, and greatly improves the polarization detection ratio of the polarized photoelectric detector.

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.

The present application discloses a flexible neural retina device and a preparation method thereof. The flexible neural retina device comprises: a flexible substrate; an isolation layer formed on the flexible substrate at a certain interval; a bottom gate electrode formed on the flexible substrate in the interval of the isolation layer; an organic ferroelectric polymer thin film formed on the structure; an inorganic hafnium-based ferroelectric thin film formed on the organic ferroelectric polymer thin film; a p-type two-dimensional semiconductor material layer and an n-type oxide semiconductor layer, both of which are overlapped with each other to form a pn junction type channel layer with photoelectric response, formed on the inorganic hafnium-based ferroelectric thin film and above the bottom gate electrode; and an electrode material stack formed on both sides of the p-type two-dimensional semiconductor material layer and the n-type oxide semiconductor layer, respectively.

The invention belongs to the field of semi-solid batteries, and particularly relates to a modified relaxor ferroelectric polymer, a modified semi-solid electrolyte, a preparation method and application of the modified relaxor ferroelectric polymer and the modified semi-solid electrolyte, and a battery. A polymer chain of the polymer modified intermediate is modified with double bonds, and then the polymer modified intermediate and a modifier are polymerized to prepare the modified relaxor ferroelectric polymer; the modifier is represented by formula 1 (). The relaxation polymer is innovatively subjected to dehalogenation treatment and then innovatively subjected to combined polymerization with the formula 1, so that the polymerization behavior and the polymerization structure can be regulated and controlled, the relaxation polymer accidentally adapts to the application requirements of the semi-solid electrolyte, the flowability of the electrolyte can be effectively bound, the electrochemical window of the liquid electrolyte is improved, and the growth of lithium dendrites on the negative electrode side is inhibited; and thus, the high-pressure resistance, the high-temperature resistance stability and the long cycle performance of the semi-solid polymer electrolyte are improved.

The invention belongs to the technical field of cable materials, and relates to a space charge self-elimination type high-voltage direct-current cable shielding material based on molecular dipole field regulation and control and a preparation method and application of the space charge self-elimination type high-voltage direct-current cable shielding material. The shielding material comprises the following raw materials in percentage by weight: 60-65% of base resin, 5-10% of ferroelectric P (VDF-TrFE) nanoparticles, 5-10% of carbon nanotubes, 15-20% of conductive filler and 2-5% of a passivating agent, wherein the sum of the weight percentages of the raw materials is 100%; and the passivating agent is nano cerium dioxide, a magnesium oxide-silicon dioxide core-shell material or a zinc oxide-aluminum oxide core-shell material. The prepared shielding material is used for preparing a high-voltage direct-current cable, the ferroelectric polymer P (VDF-TrFE) in the material is a core carrier for molecular dipole field regulation and control, the conductive filler with high structural degree is in bridge connection with the carbon nanotubes to form a three-dimensional charge dredging path, space charges are eliminated, and the high-voltage resistance of the cable is improved.

The application discloses a flexible two-dimensional ferroelectric neural synapse transistor and a preparation method thereof. The flexible two-dimensional ferroelectric neural synapse transistor comprises a flexible substrate, a gate electrode which is an organic conductive polymer thin film and is formed on the flexible substrate, a gate dielectric layer which is an organic ferroelectric polymer thin film and is formed on the gate electrode, a channel which is a two-dimensional semiconductor thin film and is formed on the gate dielectric layer, and source and drain electrodes which are organic conductive polymer thin films and are formed on both sides of the channel. The neural synapse transistor can realize neural synapse characteristic simulation and obtain stable neural synapse short-term plasticity in different bending states, and can be used in highly bending-resistant wearable neural morphological computing electronic equipment.

The invention provides a large-strain flexible ferroelectric composite film, a preparation method thereof and an electrostrictor, and the large-strain flexible ferroelectric composite film comprises a flexible piezoelectric polymer film, a 0-3 type organic / inorganic composite film, an anti-ferroelectric film, a 0-3 type organic / inorganic composite film and a flexible piezoelectric polymer film which are sequentially stacked. Wherein the flexible piezoelectric polymer film is a film formed by a relaxor ferroelectric polymer, the anti-ferroelectric film is a film formed by an anti-ferroelectric material, and the 0-3 type organic / inorganic composite film is a film formed by compounding the relaxor ferroelectric polymer and the anti-ferroelectric material. The large-strain flexible ferroelectric composite film disclosed by the invention has the characteristics of high flexibility and large electrostrictive strain, and the adaptive bending radius can reach hundreds of microns to millimeter magnitude.

The invention relates to the technical field of ferroelectric polymers, in particular to an enhanced ferroelectric polymer film based on X-ray irradiation, a preparation method of the enhanced ferroelectric polymer film and a sensor, and the preparation method of the enhanced ferroelectric polymer film comprises the following steps: providing a ferroelectric polymer film, and carrying out polarization treatment on the ferroelectric polymer film to obtain a pretreated film; and performing X-ray irradiation on the pretreated film to obtain the enhanced ferroelectric polymer film. Polarization treatment is utilized to induce orientation ordered arrangement of polar groups in a polymer molecular chain to form a beta-phase crystal structure, so that piezoelectric and pyroelectric properties are improved; then injecting energy through X-ray irradiation to promote conversion of a non-polar alpha phase to a polar beta phase, and inducing crystal rearrangement to enhance coupling between molecular chains; therefore, the polar phase content of the ferroelectric polymer film is remarkably increased under the synergistic effect of polarization treatment and X-ray irradiation, the piezoelectric coefficient and the pyroelectric coefficient are further enhanced, and finally the sensitivity of the sensor is improved.

The invention relates to a polymer essentially made up of, or consisting of, repeating motifs from vinylidene fluoride (VDF), trifluoroethylene (TrFE), and at least one third monomer different from vinylidene fluoride and trifluoroethylene, the TrFE:VDF molar ratio between the number of moles of motifs from trifluoroethylene and those of motifs from vinylidene fluoride in the polymer being from 14.0:86.0 to 50.0:50.0, said at least one third monomer having a mole fraction xt greater than or equal to 1 ppm and less than or equal to 5000 ppm, relative to the total number of moles of motifs from VDF and TrFE in the polymer.

The invention relates to an energy conversion material and device technology, and aims to provide preparation and application of a molecular ferroelectric composite film with a four-leaf clover imitating microstructure. Comprising the following steps: recrystallizing (R)-3-quinuclidinol serving as a molecular ferroelectric in deionized water to obtain a colorless (R)-3-Q crystal; the method comprises the following steps: weighing ferroelectric polymer P (VDF-TrFE) powder and (R)-3-Q crystals, respectively dissolving the ferroelectric polymer P (VDF-TrFE) powder and the (R)-3-Q crystals in an organic solvent, then mixing the two solutions, and fully stirring until the two solutions are uniformly dispersed; the mixed solution is cast on a clean glass sheet, an organic composite film is formed after vacuum drying, and four-leaf clover imitating microstructures are evenly distributed in the organic composite film. The preparation process is simple, mild and safe, the product is easy to obtain, the energy consumption is low, and the cost is low; a unique four-leaf clover imitating microstructure is arranged in the film, so that the generation of piezoelectric charges can be increased, the piezoelectric output and pressure sensing performance can be remarkably enhanced, and the conductance updating linearity in a neuromorphic function can be remarkably improved; and excellent flexibility is ensured while high ferroelectric and piezoelectric properties are realized.

The application discloses an isolation film, a battery monomer, a battery and a power utilization device. The isolation film comprises a porous base material and a ferroelectric coating layer on at least one surface of the porous base material, wherein the ferroelectric coating layer comprises a ferroelectric material, the ferroelectric material comprises an inorganic ferroelectric and a ferroelectric polymer, the ferroelectric polymer comprises polyvinylidene fluoride and a copolymer thereof, the ferroelectric polymer comprises beta-phase polyvinylidene fluoride, and the content of the beta-phase polyvinylidene fluoride in the ferroelectric polymer is greater than or equal to 60%. The isolation film can slow down the continuous growth of dendrites in the vertical electrode direction, reduce internal short circuit of the battery, improve the reliability of the battery, and also improve the coulomb efficiency and rate performance of the battery.

The invention discloses a four-phase hybrid nano composite film based on a wet process and a preparation method thereof, and relates to the technical field of film materials, and the discharge efficiency of all films is more than 80%; the dielectric constant reaches 46, and the dielectric loss is as low as 0.07; the preparation method comprises the following steps: preparing a raw material; the preparation method comprises the following steps: (1) stabilizing a PP solution at room temperature through a non-equilibrium process; (2) blending the PP solution and the P (VDF-HFP) solution; (3) preparing a BaTiO3 nano ceramic filler coated with SiO2 by adopting a Stber method; (4) doping nano ceramic particles with a core-shell structure into the polymer solution, stirring and performing ultrasonic treatment to obtain a membrane casting solution; and (5) preparing the membrane through a solution pouring method. The invention aims to provide a new thought for interface improvement of incompatible two phases represented by a linear polymer PP and a ferroelectric polymer P (VDF-HFP), solve the problems of high energy consumption, environmental pollution and the like caused by melting, hot pressing, stretching and the like when a dielectric film containing a PP component is prepared by a traditional process, reduce the cost of a film preparation process and provide new possibility for commercial development.

The invention discloses a quasi-solid aqueous zinc ion battery based on a ferroelectric coating and a sodium alginate gel electrolyte, and relates to the technical field of electrochemical energy storage. The battery comprises a positive electrode, a ferroelectric coating modified zinc negative electrode and a sodium alginate-based gel electrolyte. The ferroelectric coating is formed by compounding a ferroelectric polymer and zinc salt, zinc ion flux is homogenized by utilizing a built-in electric field generated by spontaneous polarization of the ferroelectric coating, zinc is induced to preferentially deposit, dendritic crystal growth is effectively inhibited, and side reactions are reduced; the sodium alginate-based gel electrolyte has a three-dimensional network structure, has high ionic conductivity and excellent mechanical strength, and can physically block dendritic crystal penetration and eliminate the risk of liquid leakage; the synergistic effect of the two significantly improves the cycling stability and safety performance of the battery, solves the problems of easy short circuit and short service life of the aqueous zinc ion battery, and is suitable for the field of high-safety energy storage.

The invention belongs to the related technical field of dielectric energy storage materials, and discloses a high-entropy relaxor ferroelectric polymer for dielectric energy storage and a preparation method thereof, and the preparation method comprises the following steps: (1) dissolving a relaxor ferroelectric polymer with a morphotropic phase boundary component in an organic solvent to obtain a polymer solution; (2) casting the polymer solution on a glass substrate, heating to volatilize the solvent, and then heating and annealing in a vacuum environment to obtain a polymer film; (3) the polymer film is subjected to proton beam irradiation treatment, the dose of proton beam irradiation is 10 Mrad to 40 Mrad, the high-entropy superparaelectric phase is induced through the proton beam irradiation treatment, and the high-entropy relaxor ferroelectric polymer film for dielectric energy storage can be obtained. The high-entropy relaxor ferroelectric polymer for dielectric energy storage with high discharge energy density and high charge-discharge efficiency can be obtained, the bottleneck problem of hindering application of the relaxor ferroelectric polymer in an energy storage capacitor is solved, and a new scheme is provided for large-scale application of the relaxor ferroelectric polymer.

The application relates to the field of polymer films, and discloses a polyvinylidene fluoride-based ferroelectric polymer film and a preparation method and application thereof. The method comprises the following steps: (1) mixing modified carbon nanotubes with 1,3-dioxolane to obtain a mixed solution a; (2) mixing a polyvinylidene fluoride-based ferroelectric polymer with 1,3-dioxolane to obtain a mixed solution b; (3) mixing the mixed solution a and the mixed solution b to obtain a mixed solution c, and performing spin coating and heat treatment on the mixed solution c in sequence to obtain a film; and (4) performing hot pressing treatment on the film obtained in the step (3), and then stretching. The method disclosed by the application uses a more green solvent which is small in toxicity and more environmentally-friendly, has strong process operability, is easy to be industrialized, and the prepared polyvinylidene fluoride-based ferroelectric polymer film has excellent electrical properties and physical mechanical properties, and can be very well applied to thin film capacitors.

The present invention discloses a flexible ferroelectric polymer pyroelectric material sensor and a preparation method thereof. The present invention uses a ferroelectric polymer based on polyvinylidene fluoride (PVDF). The sensor sequentially includes an upper flexible layer, an upper copper foil current collector layer, a polyvinylidene fluoride pyroelectric layer, a lower copper foil current collector layer, and a lower flexible layer. The polyvinylidene fluoride pyroelectric layer is adhered to the upper copper foil current collector layer and the lower copper foil current collector layer. The upper and lower copper foil layers adhered to the polyvinylidene fluoride pyroelectric layer are connected to an external circuit through wires. The upper flexible layer is adhered to the lower flexible layer and the polyvinylidene fluoride pyroelectric layer adhered with the upper and lower copper foil layers. At the same time, the present invention also provides a preparation method of the pyroelectric sensor. The pyroelectric sensor of the present invention has fast heat dissipation, fast response, simple structure, and the function of real-time body temperature monitoring.

The present invention belongs to the technical field of flexible piezoelectric polymer materials, and discloses an irradiated modified ferroelectric polymer and a preparation method thereof. The preparation method includes: dissolving a poly(vinylidene fluoride-trifluoroethylene) polymer with a ferroelectric phase in an organic solvent, heating to form a film, and then annealing in a vacuum environment to form a poly(vinylidene fluoride-trifluoroethylene) polymer film; wherein, the molar content of trifluoroethylene in the poly(vinylidene fluoride-trifluoroethylene) polymer is 35% - 45%; performing particle beam irradiation on the poly(vinylidene fluoride-trifluoroethylene) polymer film, and inducing the formation of a ferroelectric polymer with a morphotropic phase boundary. The present invention utilizes particle beam irradiation to form a morphotropic phase boundary in the poly(vinylidene fluoride-trifluoroethylene) polymer, thereby significantly improving the piezoelectric coefficient of the material.

The application discloses a kind of polyetherimide-based high-temperature energy storage composite dielectric materials and preparation method thereof, including preparation silicon carbide surface coating silica nano core-shell particles, obtain nano core-shell particle turbid liquid;Preparation polyetherimide solution and ferroelectric polymer solution;In nano core-shell particle turbid liquid join polyetherimide solution and ferroelectric polymer solution, preparation composite dielectric solution;Composite dielectric solution is coated on glass substrate, after series temperature drying, peeling, obtain composite dielectric thin film.The nano core-shell filler in the application has the advantage of wide band gap, enhances the insulating properties of the material, and the micron and nanoscale phase separation structure formed enhances the mechanical properties of the material, improves the breakdown field strength under high temperature conditions;Polarization response ability of composite dielectric is enhanced by interface effect between core-shell filler and polyetherimide matrix.

This invention belongs to the technical field of flexible actuation materials. It discloses a ferroelectric polymer-based nanocomposite material for actuation, its preparation method, and its application. The method includes the following steps: (1) dissolving a ferroelectric polymer with polar and nonpolar molecular conformations in an organic solvent to obtain a polymer solution; (2) dispersing nanofillers in the polymer solution to obtain a mixed solution, placing the mixed solution in a metal container and allowing it to stand at room temperature to allow the solvent to evaporate naturally and form a film, and then removing it to obtain the ferroelectric polymer-based nanocomposite material. This invention utilizes the interface effect between the ferroelectric polymer and nanoparticles to reduce the driving electric field of molecular structure phase transition, thereby obtaining excellent actuation performance. Furthermore, through a simple preparation method, it can simultaneously improve strain and elastic energy density, thus solving the problem that current ferroelectric polymer materials used as electric actuators have large driving electric fields and low output driving elastic energy.

The invention provides a modified ferroelectric polymer composite film as well as a preparation method and application thereof, and belongs to the technical field of piezoelectric composite materials. The modified ferroelectric polymer composite film comprises a ferroelectric polymer base film, and a plurality of composite nanoparticles and multi-walled carbon nanotubes which are dispersed in the ferroelectric polymer base film, the composite nano-particle has a core-shell structure, and the core-shell structure comprises a core, and an inner shell layer and an outer shell layer which are sequentially coated outside the core; the core comprises a composite piezoelectric ceramic material composed of potassium sodium niobate and barium titanate, the inner shell layer comprises polydopamine, and the outer shell layer comprises MnO2. According to the invention, the synergistic effect of the composite nanoparticles and the multi-walled carbon nanotubes on the dielectric and piezoelectric properties of the P (VDF-TrFE) material is fully exerted, so that the composite material with high dielectric constant, low dielectric loss and excellent piezoelectric property is prepared to meet the strict requirements of application fields such as high-performance sensors and the like on material properties.