25results about How to "Excellent shape memory performance" patented technology

The invention discloses liquid crystal polyimide aerogel with excellent shape memory performance and a preparation method of the liquid crystal polyimide aerogel, and belongs to the field of polymer aerogel materials. According to the liquid crystal polyimide aerogel with the excellent shape memory performance, the shape fixing rate is larger than or equal to 99%, and the shape recovery rate is larger than or equal to 97%; the heat conductivity at the room temperature is larger than or equal to 0.09 W m <-1 > K <-1 >; specifically, liquid crystal diamine, flexible diamine, a liquid crystal dianhydride monomer and a thermal curing agent are subjected to a reaction and solvent replacement, and polyamide acid dry filaments are obtained; and forming an aqueous solution from the dry polyamide acid filaments, injecting the aqueous solution into a silica gel mold, carrying out directional freezing casting on a customized freezing circulating device with a copper plate at the top, and carrying out freeze drying, thermal imidization and curing after molding, so as to obtain the liquid crystal polyimide aerogel with excellent shape memory performance.

The invention relates to the technical field of novel energy materials, in particular to a photo-thermal driving shape memory type heat storage and temperature regulation phase change material and a preparation method and application thereof, and the photo-thermal driving shape memory type heat storage and temperature regulation phase change material comprises a polyurethane phase change material and a photo-thermal conversion material; the polyurethane phase change material is prepared from polyether type polyol, polyester type polyol, isocyanate and small molecule polyol; wherein the molar ratio of the polyether type polyol to the polyester type polyol is 1: (1 to 1000), and the molecular weight of the polyether type polyol is 10000 to 900000; the photothermal conversion material comprises one or more of carbon-based materials such as graphene, graphene oxide and a carbon nano tube. The phase change material has the advantages of high enthalpy value, high strength, photothermal conversion performance, good flexibility and reversible shape memorability, simple preparation method and low cost, and can be widely used in the fields of artificial muscle fibers, heat storage and temperature regulation intelligent textiles, heat management and the like.

The invention relates to a shape memory polyimide composite material with a spider-silk-like microstructure and a preparation method and application thereof. According to the method, the composite material is designed by coupling the spider-silk-like microstructure, shape memory polyimide, a flame retardant and an electromagnetic shielding two-dimensional intercalation compound. Conductive polyaniline and transition metal carbon / nitride are subjected to an intercalation reaction to prepare a Ti3C2Tx-coated PANI intercalation compound, then the Ti3C2Tx-coated PANI intercalation compound is compounded with SMPI to serve as a spider-silk-like microstructure to enhance the mechanical strength and electromagnetic shielding performance of a resin matrix, and when the thickness of the SMPI composite material is 100 micrometers, the electromagnetic shielding effectiveness of the SMPI composite material in the X wave band exceeds 25 dB, and 99% or above of incident microwaves are effectively shielded. In addition, the flame retardant grade of the composite material reaches V0 grade, the limit oxygen index is 39.1%, the composite material also has high temperature resistance and shape memory characteristics, the shape fixation rate is 96%, and the shape recovery rate is 97%. The composite material not only can eliminate electromagnetic interference, but also can resist flame, can be automatically deformed, and is applied to the fields of self-adaptive deformation thermal management electromagnetic shielding devices, intelligent wearable equipment and the like.

The invention discloses an environmentally friendly high-elastic polyurethane modified acrylic runway surface adhesive and a preparation method thereof, which solves the problems of insufficient compatibility and mechanical strength of a plastic runway prepared by using organosilicon modified polyurethane in the existing process, and easy shedding or stratification when the organosilicon is compounded with the polyurethane. The runway surface adhesive is composed of the following raw materials: water-based polyurethane emulsion, modified acrylate, modifier, flame retardant, antioxidant, crosslinking agent, auxiliary foaming agent and white oil. The invention provides an environmentally friendly high-elastic polyurethane modified acrylic runway surface adhesive, which uses water-based polyurethane emulsion and modified acrylate as base materials, and the method of modifying the water-based polyurethane emulsion by modified acrylate is more environmentally friendly, while the modifier in the raw materials ensures that the runway surface adhesive has high elasticity and crosslinking density, and the modifier and the auxiliary foaming agent cooperate with each other to significantly improve the foaming effect of the plastic runway, and help to generate uniform and dense bubbles inside the runway surface adhesive material.

The invention relates to the technical field of biological materials, in particular to an intrauterine degradable shape memory isolating membrane and a preparation method thereof. The raw materials of the isolating membrane at least comprise a compound of an artificial high-molecular compound and a natural high-molecular compound. The mass ratio of the artificial high-molecular compound to the natural high-molecular compound is (5-95): (95-5); the isolating membrane is used for loading the medicine and continuously releasing the medicine into the uterine cavity. The isolating membrane is folded and conveyed to a womb wound part after an operation, the purpose of automatically unfolding the isolating membrane to reach the womb wound part is achieved, and intrauterine adhesion is physically blocked. In addition, the isolating membrane can load bioactive medicines according to requirements, so that the functions of relieving pain or stimulating and continuously activating an endometrial basal layer are realized, the occurrence of uterine scars is inhibited, and the normal uterine fertility function of a patient can be recovered more quickly.

The invention discloses a low-cost high-performance full-biodegradable polylactic acid-based heat-shrinkable film which is prepared from the following raw materials in parts by weight: 10-30 parts of polylactic resin, 70-90 parts of poly (butylene adipate-co-terephthalate) resin, 0.5-5 parts of a chain extension compatibilizer, 0.1-1 part of an antioxidant, 1-3 parts of a lubricant, 5-30 parts of a modified inorganic filler and 1-5 parts of an ultraviolet radiation aid, the invention also discloses a preparation method of the thermal shrinkage film. According to the thermal shrinkage film, the plastic component can be completely biodegraded in the natural environment, serious white pollution caused by the fact that the plastic is discarded into the natural environment is avoided, meanwhile, the lactide raw material part for synthesizing the PLA resin comes from grain processing by-products, and value-added utilization of the grain processing by-products is facilitated.

The invention provides shape memory water-based hydraulic damping fluid containing electromagnetic rheological polymer composite particles and a preparation method of the shape memory water-based hydraulic damping fluid, and belongs to the field of water-based hydraulic damping fluid. Ferroferric oxide is synthesized through an oxidation-precipitation method, the dispersity and stability of particles are improved through sodium citrate on the basis of the excellent magnetic performance of the ferroferric oxide, and meanwhile, a silicon dioxide shell layer is coated through a sol-gel method so as to enhance the chemical stability and oxidation resistance of the ferroferric oxide. And further modifying and introducing isocyanate propyl triethoxy silane and cystamine dihydrochloride to construct self-repairing and shape memory functions on the surfaces of the particles. And in combination with the shape memory characteristic of a polyurethane matrix, magnetic response, dynamic regulation and control and multifunctional application are realized. And the finally prepared electromagnetic rheological polymer composite particle material has excellent performance and wide application prospect.

The invention discloses a transsclera continuous drug delivery device for eye disease treatment and a preparation method thereof. The device comprises an arc body, a wing-shaped fixing plate and a fixing band. A groove is formed in the bottom surface of the arc body; the two wing-shaped fixing plates are symmetrically arranged on the two sides of the arc body. The two wing-shaped fixing plates are respectively accommodated under the abdomen of the external rectus and under the abdomen of the lower rectus; the fixing belts are fixedly connected to the bottom face of the arc body, and gaps are formed between the fixing belts and the inner wall of the groove and used for storing medicine films; the ends, away from the arc body, of the two-wing-shaped fixing plates are spaced, and the arc body and the two-wing-shaped fixing plates are integrally in a C shape. The eye drops can be well attached to eyeballs, compression on the eyeballs is reduced, free rotation of the eyeballs is not affected, wearing comfort and medicine bioavailability are improved, medicine components are prevented from leaking to the keratoconjunctival surface and fascia tissue, medicine is prevented from going into blood pressure circulation through conjunctival blood vessels and lymphatic vessels, and the risk of side effects of the whole body is reduced; and toxicity and adverse reactions are reduced.

The invention discloses a polysiloxane-based shape memory polymer and a preparation method thereof, and belongs to the technical field of shape memory polymer synthesis. The method comprises the following steps: sequentially adding a formaldehyde solution, a solution dissolved with siloxane and 2-naphthol into a container, and reacting at 90-100 DEG C for 1.5-3 hours; removing the solvent through reduced pressure distillation, then washing liquid residues for multiple times by using deionized water to obtain a product, and drying the product at 60 DEG C for 6 hours to obtain viscous liquid; the liquid is placed in a mold, then the mold is transferred into a drying oven, the temperature is increased to 120 DEG C and 140 DEG C in sequence, heat preservation is conducted for 1 h, finally, the temperature is increased to 190 DEG C to 220 DEG C, the temperature is kept for 5 h to 6.5 h, and curing is completed. The shape memory polymer formed by polymerizing siloxane and 2-naphthol has more Si-O groups, benzene rings and oxazine rings, the groups can enhance the tolerance of the polymer to high temperature, chemical or physical crosslinking points serve as a stationary phase to memorize a permanent shape, and a flexible alkyl-siloxane unit serves as a switching section to fix a temporary shape.

A preparation method of a 4D printed intelligent near-infrared responsive bone filling implant, belonging to the field of orthopedic biomedical materials, comprises the following steps: step one: preparation of a composite material for 4D printing; step two: construction of a near-infrared responsive intelligent deformable cross-mesh structure 4D filler; the present invention selects a PLA / PCL / β-TCP complex containing magnesium nanoparticles and prints a filler for filling irregular tumor postoperative bone defects through 4D printing technology, the filler can achieve minimally invasive implantation into the bone defect cavity and then expand in volume under the irradiation of near-infrared light, thereby achieving seamless filling of the cavity; by controlling the power of an infrared instrument, the dual functions of killing residual tumor cells and tissues around the cavity and promoting osteogenesis in later stages can be achieved, and the support force generated by the volume expansion of the filler at the lesion defect on the surrounding bone tissue can effectively promote the regeneration and repair of the surrounding bone.

The invention discloses a photoresponsive epoxy resin based on an azopyridine structure, and its preparation method is as follows: the amino derivatives containing azopyridine structure and epoxy resin monomer are dissolved in N, N-dimethylformamide, poured into a mold, and after drying the solvent at 50 ° C in an oven, heated to 120-160 ° C for curing reaction for 4-5h to obtain a photoresponsive epoxy resin. The photoresponsive method of the photoresponsive epoxy resin is: the epoxy resin is stretched 5%-100% at 70-150 ° C and then cooled to room temperature, and the epoxy resin is deformed under ultraviolet light irradiation of 340-380nm, and the deformed position is continuously irradiated with visible light of 420-460nm, and the epoxy resin returns to its original state. The preparation method of the photoresponsive epoxy resin based on the azopyridine structure prepared by the present invention is simple, the curing temperature is low, the curing reaction time is short, and the material has excellent mechanical properties, shape memory properties and photoresponsive properties, and has broad application prospects in the field of smart materials.

The invention relates to the field of rubber, in particular to a natural rubber material with high tear resistance and high resilience and a preparation method thereof. Allyl glycidyl ether is used as a monomer and potassium tert-butoxide is used as an initiator. Polyallyl glycidyl ether is prepared as an unsaturated polyether skeleton by anionic ring-opening polymerization, sulfonic acid anion groups and thiolated nano zinc oxide are sequentially introduced into side chains by mercapto-ene click reaction to obtain polyether anion-modified zinc oxide, and furan carboxylic acid imidazolate polyionic liquid is introduced on the surface of the polyether anion-modified zinc oxide by electrostatic assembly to obtain composite zinc oxide; furan carboxylic acid imidazolate polyionic liquid is used to wet-modify a reinforcing agent, and the furan carboxylic acid imidazolate polyionic liquid is loaded on the surface of the reinforcing agent by controlling the mass ratio thereof, thereby reducing the polarity of the surface thereof, improving the uniformity of the dispersion of the reinforcing agent in the rubber matrix, and improving the mechanical properties of the rubber material.

This invention provides a carbon dioxide-based 3D printing material, its preparation method, and its application. The carbon dioxide-based 3D printing material is prepared from raw materials comprising specific mass parts of PPC, PLA, and a compatibilizer. The compatibilizer is preferably a terpolymer of carbon dioxide, propylene oxide, and a functional monomer, wherein the functional monomer is selected from allyl glycidyl ether and / or glycidyl methacrylate having epoxy groups. Practical application has shown that the carbon dioxide-based 3D printing material provided by this invention exhibits significant impact resistance, shape memory, and self-healing effects. Its impact strength reaches 15.11 KJ / m according to the GB / T 1843-2008 standard for testing the unnotched impact strength of plastic cantilever beams. 2 The highest value can reach 20.54 KJ / m 2 Meanwhile, this carbon dioxide-based 3D printing material also possesses excellent shape memory properties.

The invention belongs to the technical field of oil well pipe manufacturing in the petroleum and natural gas industry, and discloses an iron-based shape memory alloy petroleum casing pipe and a preparation method thereof.The preparation method comprises the steps that a round pipe blank is prepared through smelting, continuous casting and forging; the round pipe blank is perforated; performing pipe rolling on the perforated round pipe blank; cooling the rolled round tube blank; carrying out heat treatment on the cooled round tube blank; and carrying out hot straightening on the round tube blank subjected to heat treatment to obtain a finished product. According to the invention, the shape memory alloy is used as the material of the oil casing, the shape memory ability and the recovery stress of the alloy are improved through the element composition design of the material alloy, the yield of the casing is improved, and when the casing deforms due to non-uniform load of a stratum, steam with the temperature of more than 300 DEG C is injected into the underground casing, so that the deformation of the casing is reduced. The deformed casing can be restored to a certain extent, so that the problem that subsequent operation tools cannot smoothly pass through for operation due to deformation of the casing of a shale gas well is solved, and the development efficiency is improved.

This invention discloses a method for preparing metal ion crosslinked shape memory polyimide aerogel fibers / fabrics. The fiber preparation method includes: polycondensing a diamine with a diacid anhydride to obtain a polyamic acid copolymer solution; chemically cyclizing the solution to obtain a polyimide copolymer solution; washing and freeze-drying to obtain polyimide copolymer filaments; redissolving the filaments and adding an organic base for deprotonation to obtain a polyimide spinning solution; extruding the spinning solution into a coagulation bath containing metal ions for wet spinning; and drying to obtain metal ion crosslinked polyimide aerogel fibers. This invention utilizes the synergistic effect of the metal ion crosslinking network and the micro / nano hierarchical porous structure to achieve fibers / fabrics that are lightweight, have high deformability, and high shape recovery rate; the woven fabric can reversibly switch between a permanent shape and a temporary shape under thermal stimulation, with changes in thermal conductivity before and after the switch, achieving reversible switching between a thermal insulation state and a thermal conduction state.

The invention relates to the technical field of elastomer materials, and provides a polyurethane elastomer as well as a preparation method and application thereof. Polyamic acid is adopted as a chain extender, and a rigid polyamic acid chain segment is introduced into a polyurethane matrix, so that the tensile strength is enhanced, and the polyurethane elastomer has relatively high mechanical performance and shows excellent shape memory performance at relatively high temperature. Furthermore, Eu < 3 + > is introduced into the polyurethane elastomer and coordinated with-COOH in a polyurethane matrix, and the cross-linking density of polyurethane is enhanced by utilizing the high bond energy of a coordinate bond, so that the shape memory performance of the polyurethane elastomer is further improved, and higher shape fixation rate and recovery rate are shown; meanwhile, due to the introduction of Eu < 3 + >, the polyurethane elastomer shows fluorescence characteristics and has a wide application prospect in the fields of anti-counterfeiting coatings and the like.

The application discloses a shape memory flexible piezoresistive sensor and a preparation method thereof. The sensor is provided with a shape memory composite conductive pressure sensitive film carrying a microstructure as a pressure sensitive layer, a shape memory polyimide film carrying a microstructure as an electrode layer, and a shape memory polyimide film without carrying a microstructure as a packaging layer. In the electrode layer, a conductive slurry is coated on the surface of the microstructure, and an electrode is drawn out. After the pressure sensitive layer, the electrode layer and the packaging layer are heated and shaped according to the temporary shape of an applied interface, the surface of the microstructure of the pressure sensitive layer is pressed on the surface of the microstructure of the electrode layer, the packaging layer is covered on the pressure sensitive layer, and the edges of the packaging layer and the edges of the electrode layer are bonded to obtain a flexible piezoresistive sensor which is fitted to the applied interface. The deformation of each layer of the sensor does not affect the sensing signal, the sensor has high sensitivity, excellent signal stability and recovery, and has a wide application prospect in the field of piezoresistive sensing.

The application provides a multi-stimulus response shape memory polyurethane composite material and application thereof. The composite material comprises a shape memory polyurethane material and a nano-functional filler, and the nano-functional filler is uniformly embedded in the shape memory polyurethane material. The provided composite material can realize multi-stimulus response and has excellent performance.

The invention relates to the technical field of polymer composite materials and intelligent polymer materials, in particular to a high-restoring-force shape memory polyurethane material based on Ag-S coordination and a preparation method of the high-restoring-force shape memory polyurethane material. A multi-stage dynamic network structure is formed in the polyurethane material, and the multi-stage dynamic network structure comprises an Ag-S coordination bond and a silver nanoparticle monomer. The multi-stage dynamic network structure further comprises disulfide bonds, PCL (Polycaprolactone) and PEG (Polyethylene Glycol) chain segments. Comprising the following raw materials in percentage by mass: 60-80 wt% of a semi-crystalline compound, 5-10 wt% of isocyanate, 5-10 wt% of a chain extender, 5-10 wt% of a cross-linking agent and 0.5-5 wt% of silver nitrate. Compared with the prior art, the method has the advantages that the multi-stage dynamic network structure is constructed through in-situ reduction of the silver nanoparticles in the system by utilizing the silver-sulfur coordination effect, and the mechanical property and the shape memory property of the composite material are remarkably improved on the premise that the composite material still has the recycling capacity and the permanent shape programmability.

This invention discloses a method for preparing a polyimide-polysiloxane block copolymer shape memory aerogel, comprising the following steps: (1) preparing a polyamic acid solution; (2) preparing a polyamic acid-polysiloxane block copolymer solution; (3) preparing polyamic acid-polysiloxane block copolymer filaments; (4) preparing an aqueous solution of the polyamic acid-polysiloxane block copolymer; (5) preparing a polyamic acid-polysiloxane block copolymer aerogel; and (6) subjecting the polyamic acid-polysiloxane block copolymer aerogel to an imidization treatment to obtain the polyimide-polysiloxane block copolymer shape memory aerogel. The shape memory aerogel obtained by this invention has the characteristics of low density, high porosity, high deformation temperature, high elongation at break, and excellent shape memory performance.

A method for preparing a membrane based on the dynamic network reconstruction of polyimide gel belongs to the field of functional materials technology. The method involves: dispersing a diamine monomer (fluorine-free) in an aprotic polar solvent under ice-water bath conditions, then slowly adding a dianhydride monomer and stirring for 18-24 hours to obtain a PAA solution; adding a triamine crosslinking agent to the PAA solution, ensuring that the total molar amounts of amino and anhydride functional groups are roughly equal during the addition process; placing the thermosetting PAA gel in an oven and heating it at 120℃-150℃ for 15-30 minutes (the higher the crosslinking agent content, the higher the required temperature and the longer the heating time), until the gel transforms into a solution state, which is then coated onto a glass plate; placing the thermosetting PAA film in a muffle furnace for gradient heating treatment, naturally cooling to room temperature, and then immersing it in 60℃ deionized water to detach the film, obtaining a thermosetting polyimide membrane. The film prepared by this invention exhibits good thermal stability and excellent shape memory performance, maintaining a shape fixation rate of 99.77% and a recovery rate of 99.95% after ten shape memory cycles.

The invention provides a 4D printing invisible appliance material based on a shape memory polymer, a preparation method and application of the 4D printing invisible appliance material and a 4D printing invisible appliance, and belongs to the technical field of high-molecular polymer materials. The 4D printing invisible appliance material disclosed by the invention is prepared from the following raw materials in parts by mass: 100 to 500 parts of polyester polyol, 400 to 800 parts of isocyanate, 400 to 800 parts of a chain extender, 200 to 4800 parts of 1-vinyl-2-pyrrolidone, 5 to 35 parts of a photoinitiator and 1 to 15 parts of a polymerization inhibitor. The 4D printing invisible orthodontic appliance material is an invisible orthodontic appliance material with shape memory performance, the excellent shape memory performance is given to the material by utilizing a cross-linked structure and a hydrogen bond network structure of polyurethane, and shape memory response can be generated in an oral cavity temperature range; and finally, slow-release and lasting light force is applied to the teeth by the shape restoring force, so that the correction efficiency is greatly improved.

The invention relates to the technical field of metal-based composite material preparation, in particular to an ultrahigh-strength gradient structure Ni-Ti-based composite material and a preparation method thereof, and the Ni-Ti-based composite material is of a three-dimensional gradient structure. The preparation method comprises the following steps that S1, Ni-Ti pre-alloyed powder is prepared; s2, the Ni-Ti pre-alloyed powder and the TiB2 ceramic particles are mixed; s3, hot pressed sintering; and S4, carrying out thermal mechanical treatment on the Ni-Ti-based memory alloy composite material. The novel Ni-Ti-based shape memory alloy composite material prepared by a method of combining low-energy ball milling, hot pressed sintering and thermal mechanical treatment has ultrahigh strength and excellent shape memory performance, does not need high-precision additive manufacturing equipment, and is simple in preparation process and relatively low in cost; and meanwhile, the method can be used for preparing large-size specification materials, hundreds of kilograms of Ni-Ti-based composite wires can be prepared at a time, and the manufacturing efficiency is high.

The application discloses a pH-reduction dual-response shape memory polyurethane composite material and a preparation method and application thereof, belongs to the technical field of functional shape memory polyurethane materials, and is obtained by co-reaction of a shape memory polyurethane material and curcumin particles; the shape memory polyurethane material is composed of a soft segment and a hard segment, the soft segment is composed of polycaprolactone dihydric alcohol and other polyester / ether dihydric alcohol, and the hard segment is formed by reaction of diisocyanate and a small-molecule chain extender; the small-molecule chain extender comprises curcumin and a Schiff base containing a disulfide bond. In the application, the curcumin is first chemically bonded to a polyurethane main chain, a reduction response site is constructed by combining a disulfide bond, and pH response is performed relying on the intrinsic structure of the curcumin; polycaprolactone crystalline soft segments are matched to realize thermal-induced shape memory; and the hydrogen bond action between the curcumin particles and the polyurethane in blending is utilized to improve the bioavailability; and the fusion of bioactivity, multiple stimulus response and shape memory is achieved.

The invention provides a degradable elastomer material, a preparation method thereof and a uterine cavity stent, and belongs to the field of medical instruments, and the method comprises the following steps: dissolving a high polymer material by adopting an organic solvent; metal powder is dispersed into the polymer solution, and suspension liquid is obtained; adding a deionized water solution into the polymer solution, and carrying out ultrasonic emulsification to obtain an emulsion of the polymer solution; and mixing and stirring the metal powder suspension and the polymer emulsion to obtain a composite solution, and solidifying, freezing and drying the composite solution to obtain the degradable elastomer material. The material can be completely degraded, the degradation speed can be adjusted through the components and porosity of the composite material, the degradation requirements of different uterine cavity stents are met, the elastic modulus of the material is close to that of uterine cavity inner wall tissue, the material has a good shape memory effect, meanwhile, release of metal ions has good antibacterial performance, and the material is suitable for being used in the medical field. And infection after the device is implanted can be avoided.