77results about How to "Good shape memory" patented technology

A self-expanding medical occlusion device treats a heart defect in a patient and is inserted into the body in minimally invasive fashion using a catheter system, and includes a braiding of thin threads which exhibits a first preliminarily definable shape as the occlusion device is being inserted into the patient's body and a second preliminarily definable shape in the implanted state, whereby the occlusion device is in a collapsed state in the first shape of the braiding and in an expanded state in the second shape of the braiding. The threads of braiding are composed of a shape memory polymer composite such that braiding deforms from a temporary shape to a permanent shape in consequence of an external stimulus, whereby the temporary shape is given in a first profile form of the braiding and the permanent shape is given in a second profile form of the braiding.

The invention discloses hydrogel with a self-repairing function and a preparation method of the hydrogel. The hydrogel is a hydrophobic unit-UPy (ureido pyrimidinone)-PEG (polyethylene glycol)-UPy-hydrophobic unit polymer. According to the preparation method, firstly, an intermediate Br-PEG-Br and a quadruple hydrogen bonding unit intermediate UPyMA are synthesized and then are copolymerized with hydrophobic units such as butyl acrylate, styrene, methacrylate containing 3-10 carbon and the like, and a target polymer is obtained. The hydrogel has high water-retaining property, varieties of hydrogel with better performance can be prepared by adjusting the proportion of hydrophilic and hydrophobic chain segments in the polymer or changing the variety of a hydrophobic monomer, and the application range is enlarged.

A high strength hydrogel having a constant swelling pressure upon implantation and thereafter is formed by preparing a hydrogel solution and then injecting the solution into a mold and cause to gel. The molded gel is then washed in a saline solution from about one day to twelve weeks, after which the gel is irradiated for sterilization purposes, dehydrated and packaged. The pre-treatment with the use of a physiologic solution results in an implant which exhibits a constant swelling pressure profile after implantation.

The invention discloses anisotropic nano-cellulose / montmorillonite composite aerogel. The aerogel is prepared by mixing a nano-cellulose suspension with a montmorillonite suspension and performing freeze casting. The invention further discloses a preparation method of the aerogel. The method comprises the following steps: (1) respectively preparing nano-cellulose suspension and montmorillonite suspension; (2) mixing the montmorillonite suspension with the nano-cellulose suspension to form uniformly dispersed nano-cellulose / montmorillonite suspension; (3) performing freeze casting on the nano-cellulose / montmorillonite suspension to obtain the nano-cellulose / montmorillonite composite aerogel. The rigidity and heat tolerance of the nano-cellulose aerogel are improved by adding the montmorillonite, and the anisotropic honeycomb shaped aerogel is prepared by means of a directional freeze drying method; and the mechanical performance of the anisotropic nano-cellulose / montmorillonite composite aerogel is superior to that of anisotropic foam-shaped nano-cellulose / montmorillonite composite aerogel prepared by a conventional freeze drying method since the stress of the aerogel mainly depends on cell wall stretching of the material rather than bending deformation of the material.

The invention relates to a bio-based thermoplastic elastomer with shape memory function and a preparation method thereof. The bio-based thermoplastic elastomer with shape memory function is prepared from the following raw materials in parts by mass: 30-80 parts of polylactic acid, 20-70 parts of epoxidized natural rubber, 0.2-2 parts of antioxidant, 0.02-2 parts of boron trifluoride etherate and 0.1-3 parts of crosslinking agent. The preparation method comprises the following steps: uniformly mixing the polylactic acid, antioxidant, boron trifluoride etherate and epoxidized natural rubber at 150-190 DEG C, and adding the crosslinking agent under high-speed shearing actions to vulcanize the rubber in situ, thereby obtaining the bio-based thermoplastic elastomer with shape memory function. The rubber phase and plastic phase of the bio-based thermoplastic elastomer respectively appear a continuous phase structure. The structure endows the material with excellent shape memory function and mechanical properties, so that the shape fixation rate is up to 100%, and the shape recovery rate is up to 90% or above.

A method for producing a polybutylene terephthalate film by an air-cooled inflation method of inflating a tube of a molten polybutylene terephthalate resin extruded from an annular die by the injection of air, the resin-extruding pressure being 8.3 to 13.7 MPa, and the resin-extruding temperature being a temperature ranging from the melting point of the polybutylene terephthalate resin −15° C. to the melting point −5° C.

A catheter assembly (10) having a catheter (12) with lumens (20a,20b), extension tubes (14a,14b) and a hub (16). Distal ends (36) of the extension tubes and the proximal end (24) of the catheter are secured in and to the hub. Fittings (50) are first affixed in the distal ends of the extension tubes and have annular collars (56) that are embedded in the hub when the hub is molded over the distal ends of the extension tubes during manufacturing. An array of annular barbs (60) secure the cylindrical portion (52) of each fitting in the respective extension tube distal end (36).

A torqued archwire for use in an edgewise orthodontic bracket system. The archwire is substantially rectangular in cross-section, is made of titanium-based alloy and has a plurality of segments, including an anterior segment which is sized to cooperate with brackets attached to a person's central and lateral teeth. Positive torque is built into this anterior segment, with substantially the same positive torque being used across the entire length of the segment. Extending from the respective ends of the anterior segment are a pair of transition segments, in which the torque built into the archwire is approximately zero. Posterior segments of the archwire, which extend distally from the transition segments, each have a negative built-in torque, with substantially the same negative torque being used across the entire lengths of these segments. For ease of reference by an orthodontist, the “active” anterior segment of the archwire is laser etched or colored with non-toxic ink.

The invention relates to the technical field of intelligent materials, and provides a shape memory composite material based on polyhydroxyalkanoate. The composite material comprises the following components in parts by weight: 30-70 parts of polyhydroxyalkanoate, 30-70 parts of polyurethane, and 0-10 parts of compatilizer, wherein the molecular weight of polyhydroxyalkanoate is greater than 10,000 g / mol; polyurethane is prepared by isocyanate and micromolecular alcohol or amine with the molecular weight less than 600 g / mol; and the content of isocyanate and micromolecular alcohol or amine in polyurethane is greater than 70 wt%. The invention further provides a preparation method of the material based on polyhydroxyalkanoate, and the application of the material based on polyhydroxyalkanoate in the aspects of biomedical engineering, textile, toys and daily supplies. The material has good biological compatibility, does not form thrombi when contacted with blood, is integrated with tissue cells well, and has a shape memory function, the shape fixing rate is greater than 80%, and the shape recovery rate is greater than 80%.

The invention provides a PVC-U (polyvinyl chloride unplasticized) tube with a shape memory function and a production method and application thereof. The PVC-U tube with the shape memory function is made from, by weight, 100 parts of polyvinyl chloride resin, 1.5-8.0 parts of a thermal stabilizer, 0.1-60 parts of a lubricant, 0-8 parts of a plasticizer, 0.5-8 parts of a processing modifier, 1-10 parts of a toughener, 0.02-5 parts of a crosslinker, 0-6 parts of an acid absorbent, and 0-30 parts of a filler. The PVC-U tube has the good shape memory function and is particularly suitable for the repair of a damaged conduit under micro-excavation or zero excavation. In addition, the production method of the PVC-U tube is simple and low in cost.

The invention discloses a composite nanometer fiber film formed by compositing chitosan, gelatin and shape memory polyurethane; the chitosan and gelatin are prepared by the weight ratio of (0.5-2):1; the total weight of the chitosan and gelatin and the weight of the shape memory polyurethane are prepared by the ratio of (0.2-2):1; the composite nanometer fiber film preparation method comprises the following steps: dissolve the chitosan, gelatin and shape memory polyurethane into a solvent so as to obtain a homogeneous solution; using a static spinning method to process the homogeneous solution so as to obtain the composite nanometer fiber film; carrying out proper after treatment for the composite nanometer fiber film. The composite nanometer fiber film is good in cell compatibility, wide spectrum antibiosis activity, haemostasis performance, permeability, mechanical strength, shape memory function, water vapor transmittance, heat stability and imbibition rate, and can be applied as biology medical dressing.

The present invention relates to fabric finishing technology, and is especially environment friendly functional fabric finishing process with low formaldehyde resin. The process includes the steps of soaking and rolling, dewatering, pre-roasting, stoving and roasting. The process is environment friendly, and finished fabric is wash and wear, shape memory, wash fast, flexible and comfortable.

Water-triggered shape memory polymers based on poly(ε-caprolactone) (PCL) and poly(ethylene glycol) (PEG) multiblock hybrid thermoplastic polyurethanes. Urethane linkages were formed through the addition reaction between isocyanate groups of the lysine methyl-ester diisocyanate (LDI) and the hydroxyl groups of either (PEG) or PCL diol.

The invention discloses a V-shaped gradient copolymer and a preparation process thereof. According to the copolymer and the preparation process, an emulsion polymerization system is used, a reversible addition fragmentation chain transfer free radical polymerization technology is adopted, a series of gradient copolymers in a V-shaped molecular chain structure are prepared through a step-by-step sectional charging method, and the series of gradient copolymers can serve as multi-shaped memory materials. According to the copolymer and the preparation process, devices are simple, the course is environmentally friendly and energy-saving, raw materials are cheap and easy to obtain, and the unique gradient copolymer has a good multi-shaped memory function, can serve as a high polymer material with the excellent performance and has broad application prospects in fields such as biological medicine, aerospace and mechanics and electronics.

The invention provides a method for preparing antibacterial shape memory fiber. The fiber is formed by compounding shape memory polyurethane and an organic antibacterial agent by a spinning technique,and has both shape memory performance and antibacterial function. The preparation method comprises the following steps: dissolving the shape memory polyurethane in dimethylacetamide to obtain 25-35 wt% of a homogeneous solution; making the organic antibacterial agent into 10-40 wt% of an aqueous solution as coagulating bath and carrying out wet spinning; and collecting and drying the fiber afterthe spinning. By using the shape memory polyurethane as a spinning material and the aqueous solution of the organic antibacterial agent as the coagulation bath and through a wet spinning technique, the antibacterial shape memory fiber is obtained by a one-step method. The antibacterial fiber has good cell compatibility, broad-spectrum antibacterial activity, good mechanical strength and good shapememory function.

The invention discloses multiple physical cross-linked hydrogel and a preparation method thereof. The preparation method of the hydrogel comprises the following steps: coating 4-{6-[3-(6-methyl-4-oxo-1,4-dihydropyrimidine-2-yl) carbamido] hexyl carbamyloxy}butyl acrylate (UPy-HCBA) in sodium dodecyl sulfonate (SDS) micelles, adding hydrophilic acrylamide monomer (AAm) and acrylic acid (AAc) outside the micelles, performing emulsion polymerization and physical crosslinking so as to prepare gel with excellent tensile property but low strength; and performing Fe<3+> coordination crosslinking on the gel, thereby obtaining the high-strength super-tensile hydrogel. The multiple physical cross-linked hydrogel is simple in preparation method, wide in raw material source and low in price, and has potential application value in the field of functional polymers.

The invention discloses a preparation method of novel rapid-responded shape memorizing polyurethane. The novel rapid-responded shape memorizing polyurethane is prepared by pre-polymerizing diisocyanate and polyester polyol, and then polymerizing with bi-selenium glycol block. The novel rapid-responded shape memorizing polyurethane comprises the following components in parts by mass: 50-100 parts of polyester polyol, 25-50 parts of diisocyanate, 12-15 parts of bi-selenium glycol, 100-200 parts of an organic solvent, and 0.05-0.1 part of a catalyst. The method specifically comprises the following steps: 1, distilling polyester polyol for 3-5h in a vacuum condition in order to remove water; and controlling the vacuum degree to be not greater than 0.08MPa; 2, sequentially mixing polyester polyol, diisocyanate, the organic solvent and the catalyst; heating in a nitrogen atmosphere until the temperature is 60-75 DEG C; and stirring for 3-6h; and 3, adding bi-selenium glycol; maintaining thereaction temperature at 60-75 DEG C; and continuously stirring and reacting for 3-6h under nitrogen protection. The shape memorizing polyurethane prepared by the method is high in shape recovery rate,and has a good memorizing effect.

The invention provides bionic double-layer dressing, comprising acellular animal intestinal submucosa and a gel layer crosslinked to the same. The acellular animal intestinal submucosa and the gel layer jointly form the bionic double-layer dressing in double-layer structure. Preparation steps include preparing the acellular animal intestinal submucosa, preparing powder of the acellular animal intestinal submucosa, preparing a solution of the acellular animal intestinal submucosa, preparing the bionic double-layer dressing; the solution of the acellular animal intestinal submucosa is mixed witha crosslinking liquid, the mixture is added to the surface of the acellular animal intestinal submucosa, and freezing and crosslinking are performed to obtain the bionic double-layer dressing. The bionic double-layer dressing has excellent tension resistance, has semipermeable barrier, can prevent moisture evaporation and bacterial penetration, is good for healing of a wound, and enables wound healing speed to be evidently increased, with the wound healing speed evidently increased on third to seventh day after surgery.

A biotic dual-layer artificial cervical intervertebral disc is composed of a cylindrical fibre ring and a cylindrical nucleus pulposus. Its preparing process includes such steps as CAD for configuring the prototype, fast shaping to obtain the moulds of artificial fibre ring and artificial nucleus pulposus, filling the aqueous solution of polyvinyl alcohol in the mould of artificial nucleus pulposus, to obtain the artificial nucleus pulposus, fixing it in the another mould, fixing a L-shaped fixer in the mould, immersing the mould in the solution of polyurethane and solidifying agent, and solidifying.

The invention provides a low-cost and stable lithium battery silicon negative electrode and a preparation method thereof. Silicon-based nanoparticles, liquid silicone rubber and ethylene-vinyl acetatecopolymer are uniformly mixed up according to a mass ratio of 10: 3: 1, and then are heated, melted and dispersed. In this way, silicon-based nanoparticles are uniformly dispersed in the melt. Afterthat, a curing agent, graphene powders and carbon fibers are added into the melt prefabricated in the step (1), and the mixture is ultrasonically dispersed to obtain a slurry. The slurry is coated onthe surface of a negative current collector, and then is cured at 80 DEG C for 2 hours. After that, the material is dried, slit and tabletted to obtain the lithium battery silicon negative electrode.According to the invention, nano silicon is directly dispersed in the deformation memory silicone rubber to prepare the silicon negative electrode. The system has self-repairing performance and shapememory performance at a certain temperature. The problem of silicon expansion fragmentation is well solved. The preparation process is greatly simplified, and the preparation cost is reduced. The defects that an existing technology for solving the problem that a silicon negative electrode is prone to expansion is complex and high in cost, and the size is increased after porosity is achieved are overcome.

The invention provides a multiblock furyl polyether ester shape memory material and a preparation method thereof and belongs to the technical field of macromolecular materials. The material has a structural formula represented by a formula (I) shown in the description. The invention further provides the preparation method of the multiblock furyl polyether ester shape memory material. According tothe method, a petroleum based raw material, i.e., terephthalic acid is replaced with biological monomers, i.e., 2,5-furyl dimethyl diformate, 2,5-furyl di-R1 diformate and 2,5-furyl di-R2 diformate, and the biological shape memory material with double melting points is prepared, so that on one hand, the dependency on petroleum resources is cast off, on the other hand, the obtained material has a good shape memory function, and the shape recovery rate is 80% or more.

Water-triggered shape memory polymers based on poly(ε-caprolactone) (PCL) and poly(ethylene glycol) (PEG) multiblock hybrid thermoplastic polyurethanes. Urethane linkages were formed through the addition reaction between isocyanate groups of the lysine methyl-ester diisocyanate (LDI) and the hydroxyl groups of either (PEG) or PCL diol.

The invention discloses a remoldable bismaleimide resin and an application thereof. The remoldable bismaleimide resin is prepared by the following steps: blending 2-allylphenyl glycidyl ether with terephthalic acid in acetonitrile, carrying out an esterification reaction with a quaternary ammonium salt as a catalyst to obtain a bis(3-(2-allylphenoxy)-2-hydroxypropyl)terephthalate containing a reversible dynamic group; and uniformly mixing the bis(3-(2-allylphenoxy)-2-hydroxypropyl)terephthalate with bismaleimide, and curing the obtained mixture to obtain the remoldable bismaleimide resin. Theremoldable bismaleimide resin prepared in the present invention has excellent heat resistance and excellent mechanical properties, and can be remolded under a hot pressing condition. The preparation method of the remoldable bismaleimide resin has the characteristics of wide sources of raw materials, and simple process, and the has remoldable bismaleimide resin broad application prospects in industrial fields of aerospace, transportation, electronic information, new energy and insulated electrics.

The invention provides a preparation method for a polycaprolactone and levorotatory polylactic acid mixture, belonging to the field of preparation of materials. The preparation method comprises the following steps: putting PLLA into an electric heating drying box and drying; commixing PCL, PLLA and TBC in a double-screw-rod extruder, wherein the rotary speed of a screw rod is 200r / min; adding 8g of TBC into each 100g of PCL / PLLA commixture; and granulating and drying the obtained commixture, and fusing and pressing the commixture in a flat plate vulcanization instrument at 170 DEG C to obtain a thin sheet. The mixture is prepared by the improvement of a traditional process method; and the compatibility of the mixture is improved in a manner of adding tributyl citrate into the mixture, so that the material has a relatively good shape memory function. The preparation method for the polycaprolactone and levorotatory polylactic acid mixture has a simple process, is easy to operate and is suitable for popularization and application.

The invention discloses a preparation method of a shape memory imprinting gel, and belongs to the technical field of adsorption material preparation. A prepared water-soluble phenylboronic acid, usedas a functional monomer, and tetrodotoxin are polymerized through a Pickering emulsion technology by utilizing the affinity effect of boron with nano-silica as a stable particle, a dispersion as a water phase and octadecyl methacrylate as an oil phase, an emulsion is introduced, polymerization is initiated by utilizing ultraviolet light to obtain a gel, and template molecules are eluted to obtainthe shape memory imprinting gel. The shape memory imprinted gel has a good adsorption separation performance and a remarkable adsorption separation effect on tetrodotoxin when applied to adsorption separation of tetrodotoxin in an aqueous solution. The prepared imprinted gel can be swelled and fully contacted with water after entering the water, the formed gel has a good structure, is not prone tobeing dispersed, can be restored to the original shape through drying after adsorption, has a certain shape memory function, is convenient for TTX enrichment, and can be repeatedly used and recycled.

The invention provides a body temperature stimulating shape memory hydrogel for hemangioma embolization, a preparation method and applications thereof. The preparation method comprises: carrying out cross-linking polymerization on acrylonitrile, acrylamide and polyethylene glycol dimethacrylate in dimethyl sulfoxide under the initiation of free radical, soaking the obtained organogel in a 25 DEG Cphosphate buffer solution, respectively soaking in a barium chloride aqueous solution and a sodium sulfate aqueous solution, depositing the barium sulfate into the gel network, and re-soaking in PBSto remove impurities so as to obtain the body temperature stimulating shape memory hydrogel spring ring for hemangioma embolization. According to the present invention, the preparation method is simple, wherein the hydrogel-based embolization spring ring is firstly prepared so as to improve the defects of low filling rate and easy re-smoothing of the commercial metal spring ring; the body temperature is the stimulation source of the shape memory effect so as to achieve the bio-friendly advantage; the modulus of the hydrogel at a normal temperature is high so as to be pushed directly; and through the in situ deposition of barium sulfate, the gel can be subjected to X-ray developing, and retains the shape memory effect.

The invention discloses a polyurethane / epoxy resin blend with shape memory, self-repairing and recyclability functions and a preparation method thereof. The polyurethane / epoxy resin blend is a homogeneous blend of polyurethane and epoxy resin or a two-phase phase separation blend formed by mixing the polyurethane and the epoxy resin and then performing crosslinking and curing with a curing agent,wherein the polyurethane is a linear polyurethane material containing a disulfide bond in the main chain, the epoxy resin is an epoxy resin pre-polymer with a side group containing a furan ring, and the curing agent contains a maleimide group. The preparation method of the polyurethane / epoxy resin homogeneous blend is as follows: dissolving the polyurethane and the epoxy resin pre-polymer in an organic solvent, performing stirring and blending at a temperature of 60-80 DEG C, and performing drying at a temperature of 60-80 DEG C after uniform stirring to obtain the blend. The shape memory, self-repairing and recovery characteristics of a polyurethane material are improved by a blending method, mechanical properties of polyurethane are enhanced at room temperature, and recyclability of thepolyurethane at high temperature is not affected.

The invention belongs to the technical field of functional materials, and particularly relates to a multi-response shape memory polyurethane material which comprises the components in percentage by mass: 6.0-10.0% of thermoplastic polyurethane, 0.5-1.0% of acrylic crosslinking resin, 0.1-1.0% of a nano reinforcing material, 0.2-1.0% of a nano conductive material, 0.1-0.6% of an organic antibacterial material, and the balance being a solvent based on 100% of total mass of the multi-response shape memory polyurethane. Through the modification and enhancement effects of the components on the polyurethane material, the polyurethane material not only has an excellent shape memory function and response performance to stimulation of water, pH and electricity, but also has good conductivity and antibacterial performance, so that the stimulation response range of the shape memory polyurethane material is expanded, the shape memory polyurethane material has a multi-response shape memory function, meets the application requirements of a multifunctional flexible sensor, and widens the application range of the shape memory polyurethane material.

The invention discloses a biodegradable cryogel dressing as well as a preparation method and application thereof, and belongs to the technical field of biomedical materials. Amino compounds are selected as main components, and the selected amino compounds have good biocompatibility and can be degraded in organisms. Therefore, the amidation reaction of amino and carboxyl in the amino compound is catalyzed by EDC hydrochloride and NHS to form a basic network structure of the cryogel. The cryogel dressing is holes communicating with each other in a free state, compared with the cryogel dressing in a shape free state, the cryogel dressing in a shape fixed state is a collapsed and closed hole, but a cryogel dressing sample still keeps an undamaged network structure. The preparation method disclosed by the invention is simple and low in cost, the biodegradable cryogel dressing is easy to carry and biodegradable, and the prepared cryogel dressing can be used for quickly stopping bleeding andhas huge potential in serving as a novel hemostatic for promoting wound healing.