42results about How to "Mechanical properties can be adjusted" patented technology

A biodegradable and bioactive medical tissue adhesive with high bilcompatibility and adjustable mechanical strength and degradating speed for adhering soft tissue and hard tissue is prepared from the liquid phase (hydroxyethyl methylacrylate ring- opening polymerized cycloester type macro-molecular monomer), the alcohol type compound (biodegradable cross-linking agent, vinylpyrrolidone, N,N-dimethyl p- tolueneamine, or hydroquinone), and the solid phase (encapsulated natural powder, pore-forming agent, and benzoly peroxide) through mixing.

The invention belongs to the technical field of preparation of heat conduction materials, and discloses a preparation method of a heat-conducting gasket with high normal heat conductivity and high elasticity. The preparation method comprises the following steps: (1) with a graphite film or a graphene film as a filler, carrying out plasma modification to obtain a first modified graphite film or graphene film; (2) hydroxylating the first modified graphite film or graphene film, and grafting a hydrolyzed coupling agent to obtain a second modified graphite film or graphene film; (3) coating the surface of the second modified graphite film or graphene film with polyolefin, carrying out pre-curing treatment, and conducting stacking by adopting a laminating process to obtain a graphite film or graphene film/polyolefin multi-layer composite structure formed body; and (4) after hot-pressing treatment, conducting cutting along a direction vertical to the upper surface and the lower surface of the multi-layer composite structure formed body to obtain the heat-conducting gasket. The obtained heat-conducting gasket is good in heat-conducting property, and when a filler content reaches 94.3%, the heat conductivity of the gasket reaches 726.1 W/(m.K).

The invention discloses a multilayer gradient biofilm and a preparation method thereof. The biofilm is prepared by electrospinning and then processes such as drying, cross-linking, and sterilization.The nanofiber biofilm has a gradient change in composition and structure, and the biofilm having a gradient structure is constructed by changing the ratio of gelatin to polycaprolactone. The mechanical properties and degradation behavior can be controlled, and the upper and lower layers of the biofilm are provided with the function of synchronously guiding soft and hard tissue regeneration. The gradient biofilm has controllable mechanical properties, degradation behavior and good biocompatibility, can simultaneously induce soft and hard tissue regeneration, and has application prospects in guiding tissue regeneration.

The invention discloses drug loading biological activity glass complex calcium phosphate bone cement and application thereof. According to the invention, drug loading biological activity glass microspheres are added into the calcium phosphate bone cement, the in vivo degradation rate of the biological activity glass microspheres is relatively high, a porous structure inside the calcium phosphate bone cement can be adjusted, a bone-like apatite layer can be formed on the surface of each biological activity glass microsphere, and the drug loading biological activity glass complex calcium phosphate bone cement has good biological activity; and simultaneously, loaded drugs are released while the biological activity glass microspheres are degraded, so that the bone cement has the effects of bone remodeling and drug therapy; and the cell proliferation is promoted by using strontium-doped octacalcium phosphate modified alpha-TCP bone cement. The calcium phosphate bone cement has moderate timeof coagulation, is good in syringeability, mechanical strength and biocompatibility, and meets clinic requirements of bone repair.

The invention discloses a preparation method of chitosan/sodium alginate composite hydrogel, which comprises the following steps: mixing a chitosan water solution and a sodium alginate water solutionto obtain a mixed solution, adding a photoinitiator into the mixed solution, and conducting irradiating under ultraviolet light to obtain the chitosan/sodium alginate composite hydrogel. By adding sodium alginate, the brittleness of the chitosan hydrogel can be improved by utilizing sodium alginate with good plasticity and toughness, and the mechanical property of the gel is optimized; and the mechanical property of the hydrogel can be regulated and controlled by controlling the mixing ratio of the chitosan aqueous solution to the sodium alginate aqueous solution, and the breaking strength ofchitosan can be increased from 2 MPa to 6 MPa to the maximum extent. Meanwhile, the prepared chitosan/sodium alginate composite hydrogel has the antibacterial property of chitosan and the biological activity of sodium alginate. The hydrogel is loaded on the surface or inside an implant, and is expected to be widely applied to the fields of antibacterial dressings and drug controlled release.

The invention discloses an electric pulse treatment method for improving the defect or structure state of selective laser melting additive manufacturing titanium alloy, and belongs to the technical field of additive manufacturing material optimization. The method is characterized in that the additive manufacturing titanium alloy is subjected to electric pulse treatment, and the defect or the structure state of the titanium alloy is improved to a certain extent, wherein in the treatment process of optimizing the structure state of the titanium alloy through the electric pulse, the electric pulse discharging waveform is a damping wave, the discharging period is 400 ns, and the treatment voltage and the treatment frequency are 6 kV-1 times, 7 kV -1 times, 7.5 kV -1 times, 8 kV -1 times and 8.5 kV -1 times correspondingly; and in the treatment process of optimizing the defect state of the titanium alloy through the electric pulse, the electric pulse discharge waveform is a damping wave, the discharging period is 400 ns, and the treatment voltage and treatment frequency are 3.5 kV-3 times. The electric pulse treatment method can be used for research and application of defect and structure optimization of the additive manufacturing titanium alloy.

The invention discloses recyclable cellulose-based conductive self-repairing eutectic gel as well as a preparation method and application thereof. The cellulose-based conductive self-repairing eutectic gel based on the imine bond and hydrogen bond reversible network is constructed by adopting polyvinyl alcohol (PVA), dialdehyde carboxymethyl cellulose (DCMC) and gelatin as raw materials, mixing and reacting with a deep eutectic solvent (DES) and utilizing a freeze drying or directional freezing-unfreezing and freeze drying method. Compared with the existing conductive gel, the eutectic gel disclosed by the invention has the characteristics of good mechanical property, anisotropic structure, self-repairing property, freezing resistance, adhesion, reproducible raw materials, low production cost, recyclability, environment friendliness and the like. When the device is used for a sensor, the change condition of strain, the change condition of temperature and humidity and the change of breathing speed and mode can be visually observed.

The invention provides a woven reinforced degradable polyurethane elastomer artificial blood vessel and a preparation method thereof. The inner layer of the artificial blood vessel adopts activated H2N-PEG-COOH, heparin and (Mpa)-GGGGGREDV polypeptide to treat a C-PEEUU-NH2 electrospun nanofiber tubular stent to obtain a C-PEEUU-PEG-Hep/REDV tubular stent, the middle layer adopts a woven reinforced layer of nanofiber yarns woven by dissolving and mixing one or more master batches of PLGA, PDO and PGA according to a mass ratio, and the outer layer is a macroporous layer prepared by thermally induced phase separation. The woven reinforced degradable polyurethane elastomer artificial blood vessel provided by the invention can be used for tissue regeneration and construction of cardiovascularand cerebrovascular diseases, the preparation method is simple and efficient, the price is low, and the prepared artificial blood vessel has resilience, compliance, bursting strength and biocompatibility matched with autologous vascular tissues. The artificial blood vessel has no hypersensitivity to a human body in a transplantation operation, has affinity with blood and peripheral tissues in thehuman body, and has a good application prospect in repair operations of cardiology surgery, nephrology surgery and brain surgery.

The invention relates to a high-toughness and low-resistivity silver-gold alloy bonding wire. The high-toughness and low-resistivity silver-gold alloy bonding wire is prepared from the alloy components in percentage by weight: 80%-100.0% of Ag, 0%-20.0% of Au, and 0%-0.01% of two or more of Ce, Cu, Pd, Be, Mg and Ca which are minute in content. According to the high-toughness and low-resistivity silver-gold alloy bonding wire, the fracturing load is larger than 10 cN, meanwhile the elongation is larger than 18%, the mechanical property is adjustable and controllable, and the resistivity is smaller than 1.8 [mu]omega.cm; and the using cost of the silver-gold alloy bonding wire is lowered by 80% or above compared with the material cost of an existing bonding alloy wire, the mechanical property, the electrical property, oxidation resistance and the bonding property are excellent, and thus the high-toughness and low-resistivity silver-gold alloy bonding wire can be widely applied to the field of packaging.

The invention provides a three-dimensional multistage highly-ordered hydroxyapatite super-long nanowire fiberboard-mud structure composite material, a preparation method and application thereof. The composite material is formed by assembling ordered structure macroscale fiber and organic matters, wherein the ordered structure macroscale fiber is formed by taking hydroxyapatite super-long nanowiresas the inorganic unit, the content of the hydroxyapatite super-long nanowire is 60-90wt.%, and the content of the organic matters is 10-40wt.%.

The invention discloses 3-azidomethyl-3-methyloxetane-tetrahydrofuran energetic copolyether with an alternating multi-block structure and a synthesis method thereof. The structural formula of the alternating multi-block energetic adhesive is shown as (I) in the specification, wherein m is equal to 1-5, n is equal to 1-4, k is equal to 1-10, and m, n and k are integers. The synthesis process comprises the following step of: by taking polytetrahydrofuran (PTHF) and a 3-azidomethyl-3-methyloxetane homopolymer (PAMMO) as raw materials and KOH as a catalyst, carrying out a Williamson ether synthesis method to obtain the alternate multi-block azido energetic adhesive. The synthesis method is simple, and the alternating multi-block AMMO-THF energetic adhesive has an adjustable microscopic sequence structure and can endow a material with relatively good mechanical properties and processability.

The invention provides a composite plasticizer used for a CL-20-based cast PBX explosive, and preparation method thereof. The composite plasticizer contains an ester compound and liquid paraffin; the general formula of the ether compound is shown in the description, and R1 and R2 in the formula are respectively selected from C6-C12 linear or branched alkyl groups. The composite plasticizer comprises, by weight, 1-99% and preferably 20-80% of the ether compound, and 1-99% and preferably 20-80% of the liquid paraffin. The composite plasticizer has the advantages of good intersolubility with HTPB, low water content, high purity, high combustion heat and good vacuum stability, and the CL-20-based cast PBX explosive applying the composite plasticizer has the advantages of high solid content, adjustable mechanical performances, good usability, short preparation time and low energy consumption.

The invention relates to a light-responsive and anti-freezing elastic gel fiber and a preparation method thereof. The light-responsive and anti-freezing elastic gel fiber is prepared from 0.01-1 partof ferrous chloride, 0.005-2.5 parts of citric acid, 0.1-3 parts of an acrylamide-sodium acrylate random copolymer and 1-10 parts of a solvent. The prepared elastic gel fiber has the advantages of flexible stretchability, light response, adjustable modulus, freeze resistance, a simple preparation method and the like, and therefore the prepared elastic gel fiber has the potential for large-scale preparation and broad application prospects.

The invention belongs to the technical field of composite materials, and particularly relates to an absorbable self-reinforced composite material and preparation thereof. In particular to a composite material obtained by mixing magnesium or alloy powder thereof with biological ceramic powder and absorbable polyester powder and preparation thereof, which are obtained by physical and mechanical mixing, the preparation process is simple, the efficiency is high, and the yield can be realized. And the obtained composite material can be used for preparing medical devices with corresponding shapes by means of mould pressing, machining and the like.

The invention discloses a preparation method of a wear-resistant polyimide film, which comprises the following steps: in an inert gas atmosphere, adding a mixed filler into an aromatic diamine solution, uniformly mixing, adding aromatic dianhydride, and reacting to obtain an intermediate material; defoaming the intermediate material, coating the surface of a substrate with the defoamed intermediate material, and carrying out imidization and demolding to obtain a wear-resistant polyimide film; wherein the mixed filler is molybdenum disulfide, nano polytetrafluoroethylene, modified carbon nanotubes and a silane coupling agent. The invention also discloses a wear-resistant polyimide film which is prepared according to the preparation method of the wear-resistant polyimide film. The wear-resistant polyimide film has good wear resistance and good mechanical properties.

The invention provides a porous fluid as well as a preparation method and application thereof. The preparation method comprises the steps that: 2-methylimidazole and N-(3-azide)-N, N-dioctyl-N-methyl ammonium bromide are dissolved in an organic solvent, under the protection of inert gas, COR and PMDETA are added, stirring is conducted for 8-14 h at the room temperature, and a crude product A is obtained; the crude product A is purified and dried to obtain a substance A; the substance A, PEGS and an ethanol solution are mixed, a reaction is performed at 60-80 DEG C for 8-14 hours, and dialyzing is performed for 60-80 hours to obtain an ionic liquid for later use; and nano-scale MOFs are dispersed in an ethanol solution, then the ionic liquid obtained in S2 is added, uniform mixing is performed, shaking is performed for 8-14 hours, the solvent is removed, and drying is performed to obtain the porous fluid. The porous fluid provided by the invention has both flowability and porosity, and has a wide application prospect.