41 results about "Shape-memory polymer" patented technology

The present disclosure relates to a composition for underfill and a method for manufacturing the same, in which spherically and temporarily fixed high-thermal-conductivity shape-memory polymer composite particles are applied to the underfill, maintaining low viscosity during the filling process, and, at curing temperature, the particles are restored to a high aspect ratio shape to form a thermally conductive network between ceramics, thereby simultaneously achieving low filling viscosity and high heat dissipation performance.

The application discloses a piezoelectric tactile sensor, which comprises at least one first conductive layer containing graphene and one second conductive layer; a programmable shape memory polymer matrix, in which polarizable zinc oxide nanoparticles are dispersed; the programmable shape memory polymer matrix is arranged between the first conductive layer and the second conductive layer, so that the sensor can generate an electric signal under mechanical stress; the programmable shape memory polymer matrix can present at least two different programmed mechanical states under external stimulation, so that the same tactile stimulation applied to the sensor can generate a plurality of different piezoelectric signals, and the different piezoelectric signals correspond to different programmed mechanical states of the programmable shape memory polymer matrix. Meanwhile, a manufacturing method of the sensor and an application thereof are provided; and the application can realize more accurate material identification, defect detection and mechanical parameter estimation.

The application discloses a cavity-column combined shape memory polymer stamp and a microchip proximity transfer method thereof. The stamp takes shape memory epoxy resin as a matrix, and a cavity-column combined structure is directly formed through laser microprocessing. The stamp realizes an adhesion switching ratio of up to 1200 by utilizing the change of the elastic modulus of the cavity-column combined shape memory polymer stamp before and after the glass transition temperature, and realizes the low-cost microchip high-precision proximity transfer of high-adhesion pickup and low-adhesion release by combining negative pressure auxiliary adsorption and micro-column directional pushing. The stamp has simple preparation process, does not need complex photoetching process, and can be flexibly regulated and controlled according to the performance requirements of the stamp. The stamp can be adapted to silicon, polyimide, copper, glass, acrylic and other material chips with roughness of 1nm-500nm. The maximum strain of the stamp is only 0.27 during the transfer process, the interface temperature is controllable, the residual adhesion strength is small, and the problems of the existing transfer technology, such as complex preparation, narrow application range and low transfer reliability, are solved.

Stretchable shape-memory polymer composite skin with a Poisson's ratio of zero, comprising the following parts: a main body made of conductive fibers; several metal frames made of metallic aluminium material, arranged under the main body, from which the electrical power is transferred to the main body; and a multitude of reinforcing elements made of synthetic resin or plastic material, each connected at intervals to the lower part of the main body by the several metal frames, the temperature in the main body can change based on the electrical power transmitted by the multiple metal frames.

This invention discloses a high-wear-resistant lubricating oil and its preparation method, relating to the field of lubricating oil technology. The high-wear-resistant lubricating oil, by weight, comprises: 85-92 parts base oil, 3-5 parts shape memory polymer, 2-4 parts metal-based shape memory alloy, 0.05-0.1 parts functionalized graphene, 0.5-1 parts self-cleaning additive, 5-8 parts nickel-titanium-niobium magneto-controlled shape memory alloy, and 2-3 parts phase change heat storage microcapsules. This invention, by compounding the base oil with the shape memory polymer, metal-based shape memory alloy, functionalized graphene, self-cleaning additive, nickel-titanium-niobium magneto-controlled shape memory alloy, and phase change heat storage microcapsules in a specific ratio, compared with existing technologies, can improve the wear resistance life of the lubricating oil under different load and temperature conditions. Therefore, it solves the problem that traditional lubricating oils have large performance fluctuations under varying operating conditions and are difficult to meet lubrication requirements under high and low temperatures and different load conditions.

This invention discloses a functional coating material for automobiles, a method for preparing a vehicle coating, and a vehicle, relating to the field of vehicle coating technology. The functional coating material may include a topological insulator material Bi2Se3 and a shape memory polymer. After the functional coating material is applied to the surface of the vehicle body or vehicle components to form a coating, the coating reduces wind resistance. The topological insulator material Bi2Se3, in conjunction with the shape memory polymer, utilizes light energy to repair the coating. The Bi2Se3 topological insulator included in this functional coating material effectively optimizes the vehicle coating, not only effectively reducing wind resistance but also enabling the coating to self-heal through the combination of Bi2Se3 and the shape memory polymer.

The application provides a multifunctional intestinal stent and a preparation method thereof. The multifunctional intestinal stent comprises, from outside to inside, an anti-tumor layer, a load-bearing layer and an anti-stenosis layer. The anti-tumor layer comprises an outer layer and an inner layer, wherein the outer layer is a nanofiber membrane containing MXene, and the inner layer is a composite membrane containing a chemotherapeutic drug, and the inner layer is in contact with the outer side of the load-bearing layer. The load-bearing layer is a tubular stent obtained by 4D printing of a shape memory polymer material. The anti-stenosis layer contains triprolidine. The multifunctional intestinal stent provided by the application can not only rapidly and continuously treat intestinal obstruction caused by space-occupying tumors, but also facilitate coordinated deformation, reduce tissue abrasion, and has an anti-restenosis function, so as to better maintain normal intestinal function.

This invention relates to a gastric drug delivery system based on biomechanically responsive intelligent deformation and anchoring, and its preparation method. The system includes a main body, multiple microneedle structures, a drug-loading unit, and a controlled-release unit. The main body is made of a thermoresponsive shape memory polymer and includes a head and multiple tentacles. The head is spherical with an opening, and the tentacles are distributed around the opening. Multiple microneedle structures are disposed on the tentacles. The drug-loading unit contains a metal-organic framework carrier and a drug, with the drug loaded on the metal-organic framework carrier. The drug-loading unit is distributed in the main body and / or multiple microneedle structures. When a triggering factor occurs, the drug-loading unit releases the drug. The controlled-release unit is used to control the release rate of the drug in the drug-loading unit. The main body structure of this invention utilizes the shape-restoring force generated by thermo-induced mechanical deformation to achieve stable buoyancy and fluid obstruction in gastric juice. The microneedle structures anchor to the gastric wall, effectively counteracting mechanical displacement caused by gastric peristalsis, enabling precise on-demand drug delivery.

The present invention relates to the field of fibers, and in particular to a shape memory polymer fiber (SMPF) for textile or medical applications, which can maintain constant shape fixity and recovery even after multiple shape memory cycles. The present invention relates to a coated shape memory polymer fiber (cSMPF) (1) having a core fiber (10) containing a shape memory polymer fiber and a substantially inelastic covering yarn (20), wherein the covering yarn (20) is wound around the core fiber (10), and the maximum engineering strain (ε) of the core shape memory fiber is controlled. max ) is the yield strain (ε yield ) or less, thereby limiting the stretch or deformation of the textile and / or fabric comprising the core shape memory fiber and / or the coated shape memory fiber during programming or use, ensuring maximum recovery strain. Also disclosed are coated shape memory polymer fibers (cSMPF) (1), shape memory fibers, and methods of making shape memory textiles comprising coated shape memory polymer fibers (cSMPF).

This application provides a printable shape memory polymer composition for fabricating 4D printed dental orthodontic appliances. The composition comprises a first (meth)acrylate monomer, a second (meth)acrylate monomer providing transient crosslinking for the printable shape memory polymer composition, one or more crosslinking agents, and a photoinitiator, wherein the printable shape memory polymer composition responds to a temperature change at temperature T. g The shape memory polymer composition becomes flexible, allowing it to be printed at temperature T. g The shape is shaped and reshaped. This application also discloses a 4D-printed dental appliance comprising the printable shape memory polymer composition.

The application discloses a special notch type temperature shrinkage induced fiber for anti-cracking of mass concrete and a preparation method thereof, the fiber is a composite fiber with a core-shell structure, the material of the core layer is a shape memory polymer, the material of the shell layer is a biobased degradable polyester, and periodic notches are arranged on the surface of the shell layer along the axial direction of the fiber. The application adopts a shape memory polymer as the core layer, a biobased degradable polyester as the shell layer to form a core-shell structure, and periodic notches are arranged on the surface of the shell layer along the axial direction of the fiber. Compared with the prior art, the application first applies the shape memory polymer and the biobased degradable polyester in combination to temperature shrinkage control of concrete, and realizes an intelligent anti-cracking mechanism of "induction-passivation" through the difference in the thermal mechanical properties of the materials and structural stress concentration design. The fiber can actively guide stress release during the temperature shrinkage stage of the concrete, converts wide and disordered cracks into a fine and uniform micro-crack network, and fundamentally solves the problem of harmful cracking of mass concrete.

This invention discloses a multi-effect synergistic repair scaffold for large bone defects and its preparation method. This invention relates to the field of biomedical materials technology. The scaffold comprises a three-dimensional biomimetic structure with a central tubular channel. The structure consists of a core layer, a middle layer, and an outer layer from the inside out. The core layer is a hollow structure made of shape memory polymer material, and the middle layer is a biodegradable biomimetic porous ceramic matrix loaded with a first bioactive factor. The advantages of this invention are: by constructing a hierarchical structure of core layer-middle layer-outer layer, it integrates mechanical support, osteogenic activity, vascularization, and immune regulation functions, achieving synergistic intervention throughout the entire process of repairing large bone defects. The core layer uses a shape memory polymer, which not only provides axial compressive strength but also allows the scaffold to be implanted via minimally invasive surgery in a folded state. After implantation, it automatically recovers its shape at body temperature, closely adhering to the user's bone interface.

The invention discloses a quick-response folding unmanned aerial vehicle based on composite material 4D printing. The quick-response folding unmanned aerial vehicle comprises a driving assembly, a folding wing assembly, a supporting and connecting assembly, a power supply assembly and a control assembly. The folding wing assembly is a folding wing manufactured on the basis of composite material 4D printing, the folding wing adopts a shape memory polymer matrix composite material as a base material and is integrally formed through a 4D printing process, and composite material layers with different thermal response characteristics are integrated in the folding wing assembly. Spontaneous folding and unfolding are realized under the stimulation of an external temperature field which is 100 DEG C higher than the glass transition temperature; the driving assembly, the folding wing assembly, the power supply assembly and the control assembly are fixedly installed on the supporting connecting assembly through standard interfaces. According to the invention, the complex terrain operation capability can be greatly improved.

This application relates to the field of medical device technology, providing a programmable shape memory bone screw, its preparation method, and its application. The programmable shape memory bone screw comprises a screw body made of shape memory polymer material, the surface of which is coated with a polydopamine layer, and the surface of the polydopamine layer is coated with a calcium ion-arginine composite coating. The provided bone screw possesses superior mechanical and shape memory properties; it can utilize its shape memory function to provide mechanical stress stimulation to bone defect tissue, thereby activating mechanically sensitive calcium ion channels, inducing the influx of calcium ions and arginine from the coating into cells, thereby upregulating the NO-cGMP pathway, synchronously coordinating osteogenic and angiogenesis, and accelerating bone repair; it has an osteogenic-angiogenic coupling function, which can enhance and accelerate bone regeneration, exhibiting excellent biomechanical properties and synchronously coordinating osteogenic and angiogenesis during the bone repair process.

The application provides a shape memory material-based metamorphic satellite structure and relates to the technical field of space satellites. The metamorphic satellite structure comprises a variable-configuration regular pentagon module and a variable-configuration regular hexagon module made of shape memory material, the variable-configuration regular pentagon module is connected with the variable-configuration regular hexagon module to form a spherical polyhedral structure, and the variable-configuration regular pentagon module and the variable-configuration regular hexagon module are both used for synchronous contraction or synchronous expansion by temperature change. The structure is optimized through material-structure collaborative design, the characteristics of the multi-stable structure that can still maintain a stable geometric configuration after load removal are utilized, the configuration stability of the system is fundamentally improved, and the dependence on single material characteristics is reduced; even when the shape memory polymer and the composite material thereof cause incomplete phase change due to temperature fluctuation, the system can still maintain a target configuration, and the reliability in an extreme space environment is significantly improved.

This invention discloses a composite heat exchange tube capable of synchronous thermal expansion. The composite heat exchange tube is composed of an inner tube and an outer tube. The inner tube is a polymer expansion tube, and the outer tube is a metal tube. The polymer expansion tube is made of shape memory polymer material. The composite heat exchange tube provided by this invention possesses the rigidity and strength of metal, while also possessing the good elasticity and corrosion resistance of polymer materials. Furthermore, the expansion coefficient of the heat exchange tube made of composite material is the same as that of the metal tube, avoiding material separation caused by inconsistent expansion of the two materials during the manufacture of heat exchanger equipment, which would lead to increased thermal resistance and reduced heat transfer coefficient of the heat exchanger.

The present application relates to a kind of preparation method of shape memory reversible biomimetic adhesive material, belong to biomimetic material technical field.The method includes: with PVC gel preparation male die, copy PDMS female die;Shape memory polymer matrix, curing agent and toughening copolymer are mixed into epoxy resin precursor;By template method in PDMS female die solidification, obtain the adhesive material with microstructure array.The material can realize adhesive reversible switching by flexion mechanism under thermal stimulation: heating to above glass transition temperature, microstructure softening flexion and increase contact area, produce strong adhesion;After cooling, hardening keeps state;Again heating then shape recovery, realize low energy consumption detachment.The present application process is simple, and material has high adhesive strength, fast response, long life and good adaptability, can be widely applied in intelligent robot, precision manipulation and flexible electronic etc.Field.

The utility model relates to the technical field of pitch base carbon plate, and disclose a pitch base carbon plate with folding resistance, including first support board and second support board, be provided with the folding board between first support board and second support board, the folding board is the structure of the middle thin two sides thick, and one side of folding board and first support board and second support board are flush, the other side of folding board is equidistantly seted up folding guide groove, the utility model discloses the utility model discloses through reasonable material selection and structure design, give consideration to high temperature creep resistance and low temperature deformation adaptability. The synergistic effect of three-dimensional woven carbon fiber support board and silica gel folding board, shape memory polymer layer and flexible intermediate layer improves the overall temperature resistance and folding stability, significantly prolongs the service life of flexible screen equipment under complex working conditions.

This invention discloses a rotationally foldable heart valve based on shape memory polymer and a folding method, relating to the field of artificial heart valve technology. The valve includes leaflets and a valve frame, with the leaflets fixed to the inner side of the valve frame. The leaflets are made of shape memory polymer. The folding method involves placing the valve with the sutured leaflets and valve frame in an environment below the glass transition temperature of the leaflets for cooling, then pressing the two together, and finally installing the pressed valve onto a delivery system. This invention uses shape memory polymer as the material for the leaflets. After implantation, the leaflets can recover their original shape due to the properties of the shape memory polymer, thereby improving the lifespan of the leaflets.

This invention discloses a functional current collector and its preparation method, relating to the field of lithium battery technology. The method includes the following steps: Step 1: Preparing a spinning solution containing a shape memory polymer, and electrospinning it to obtain a polymer fiber membrane; Step 2: Sequentially subjecting the polymer fiber membrane to gradient carbonization and functionalization treatments to obtain a honeycomb carbon skeleton containing the shape memory polymer; Step 3: Performing pulse electrodeposition on the honeycomb carbon skeleton containing the shape memory polymer to construct helical aluminum fibers and gradient nanowires, obtaining the functional current collector. This application addresses the problem that traditional functional current collectors cannot dynamically adapt to the volume changes of highly expanding electrode materials, providing a functional current collector with "breathing" volume regulation capabilities. Through a triple design of "dynamic skeleton, flexible fiber, and adaptive interface," it achieves long-term buffering against volume expansion of >500%.

The application provides a flow self-adaptive irrigation dripper based on shape memory effect and an agricultural irrigation system, which comprises a shell, a main flow channel, a sleeve and a connector, one end of the shell is connected with a water supply end through the connector, the sleeve is installed in the shell, the inside of the sleeve is provided with the main flow channel with variable effective nominal diameter, the main flow channel is a radial harmonic wave structure, and the main flow channel is made of shape memory polymer; the main flow channel is loaded with stimulation, so that the main flow channel moves along the axial direction, and the effective nominal diameter is changed. The application can realize dynamic adjustment of the flow channel cross-sectional area, realizes self-adaptive irrigation with rapid response, and solves the problems of poor anti-blocking property, response lag and high energy consumption of the traditional drip irrigation system.

This invention discloses a bioactive suture for muscle fixation surgery and its preparation method. The suture has a coaxial three-layer structure, comprising a shape memory polymer core layer, a biodegradable intermediate layer, and a permanently woven outer shell layer radially from the inside to the outside, and longitudinally divided into three functional zones: a bone end zone, a transition zone, and a tendon end zone. The shape memory polymer core layer uses a polylactic acid / polyhydroxybutyrate valerate blend, which triggers controlled contraction under body temperature and hydration conditions, automatically compensating for tension loss caused by postoperative edema reduction. The biodegradable intermediate layer uses polylactic acid-glycolic acid copolymer microspheres with different ratios to achieve longitudinal, zoned, and time-sequential release of various bioactive factors such as bone morphogenetic protein-2 and vascular endothelial growth factor. This invention integrates tension self-regulation, time-sequential release, and surface biomimicry, and is suitable for tendon-bone insertion reconstruction after amputation.

The application discloses a multi-tube segment variable rigidity magnetic drive catheter and surgical robot. The magnetic drive catheter comprises a distal small catheter (1) and a main catheter (2), the distal small catheter is connected at the distal end of the main catheter; the distal small catheter can be controlled to change rigidity, the distal small catheter comprises a certain number of sub-tube segments (11), the sub-tube segments are sequentially connected together in a head-to-tail mode; the sub-tube segment is composed of an inner tube body and an outer tube body, the material of the outer tube body is a shape memory polymer, a heating coil (4) is arranged in the outer tube body, and annular magnets (12) are uniformly and discretely distributed on the distal small catheter. The distal small catheter in the magnetic drive catheter can control the rigidity of each part through the mode of controlling temperature, then the attitude of the distal small catheter is controlled by using the magnet at the end of the mechanical arm of the surgical robot, the catheter based on the mode has a small outer diameter and can be stretched into a small human body cavity for treatment under the premise that the inner diameter of the working channel is not reduced.

This invention belongs to the field of medical devices, specifically relating to a positioning and marking device for breast tumor surgery. The device includes a guide needle, a tissue marker clip, a delivery component, and a flexible outer sheath fitted over the needle. The flexible outer sheath is made of a biocompatible shape memory polymer. At body temperature, it is in a first physical state, puncturing the tissue along with the needle. Upon gentle thermal stimulation, it transforms into a second physical state, significantly reducing friction with the needle, allowing the needle to be withdrawn independently, leaving the flexible outer sheath in place within the body, forming a stable guiding channel from the body surface to the marked location. The device can also integrate an intelligent temperature control unit, achieving closed-loop regulation through temperature sensor feedback to ensure safe and effective thermal stimulation. This invention solves the intraoperative positioning problem caused by lesion shrinkage after chemotherapy, combining long-term placement safety, puncture rigidity, and placement flexibility, significantly improving the accuracy and reliability of surgical positioning.

The disclosed technology includes a bioabsorbable material configured to be delivered to tissue. The material includes a shape-memory polymer that is compressible in a delivery configuration and configured to swell within a given period of time. The shape-memory polymer includes one or more functional groups for reversible bonding between adjacent functional groups so that, upon exposure to a stimulus, it transitions between a substantially linear polymer and a substantially nonlinear polymer.

The application discloses a kind of hollow porous composite fibers, and intelligent packaging material for hollow core optical fiber coupling connection, belong to optical fiber technical field, the hollow porous composite fiber includes shell layer and core layer, the shell layer includes polyurethane layer, the core layer includes ultraviolet response shape memory polymer material layer;The hollow porous composite fiber provided by the application can be applied to hollow core optical fiber coupling connection as intelligent packaging material, when being applied, only need ultraviolet irradiation to trigger material to occur accurate, controllable deformation, so that packaging material is adaptively shrunk and tightly wrapped optical fiber joint, realizes from mechanical exertion external force to material active adaptation intelligent packaging mode.

The application discloses a hot forming die for motorcycle lamp, and relates to the technical field of plastic hot forming.The die is provided with a sealing strip made of shape memory polymer on the end faces of the upper and lower dies, which is softened to realize sealing during high-temperature forming and is hardened to reset during temperature reduction and shaping, and the cutting mechanism is automatically triggered during the deformation process.The sealing strip is connected with a sliding strip and a T-shaped connecting rod, the inner tooth ring is engaged with the transmission gear of the cooling fan, the cutting strip is driven to reciprocatingly cut the edge of the lamp by the rotating force of the fan.The core advantage of the design is that the integration of forming and trimming is realized, the cut plastic waste can be directly discharged from the die for recycling, no additional secondary processing procedure is needed, the production efficiency is improved, the processing problem of the excess edge and corner material is effectively solved, and the double cooling system of the water cooling assembly and the cooling fan is combined, so that the shaping speed and the machining precision are further improved.

The application relates to the technical field of high polymer materials, and discloses a bottle-brush structure-based shape memory polymer and a preparation method thereof, which comprises the following steps: dissolving a polycaprolactone precursor modified by thioctic acid at two ends in a good solvent to prepare a polymer solution, and irradiating the polymer solution with ultraviolet light in a mold to induce the photo-dimerization reaction of thiolane groups at the chain ends of the polymer to crosslink and polymerize the polymer into a product, and complete the structure construction of a covalent self-adapting network rich in dynamic disulfide bonds. The bottle-brush crosslinking network is constructed by adopting a photo-induced disulfide bond crosslinking mechanism, the material can be solidified and formed at room temperature, and the thermal degradation of the polymer main chain caused by high temperature is avoided; meanwhile, the dynamic exchange mechanism of the disulfide bond is utilized, the polymer network can be degraded and regenerated, and the problems that a conventional shape memory polymer cannot be reshaped after being formed and cannot be recycled by chemical closed loop are solved.