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

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 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.

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 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 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.

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 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.