7 results about "N-n-propylacrylamide" patented technology

This invention relates to the field of polymer materials technology and provides a high-performance PVDF ultrafiltration membrane and its preparation method, comprising the following steps: dissolving PVDF in a solvent, adding ethyl 2-bromoisobutyrate, CuBr / tris-(2-dimethylaminoethyl)amine and N-isopropylacrylamide for reaction; subsequently adding polyethylene glycol methacrylate, heating and reacting, followed by precipitation and drying to obtain a triblock copolymer; mixing the triblock copolymer with PVDF, adding it to a mixed solvent containing ionic liquid, dissolving and degassing to obtain a casting solution; casting the casting solution onto a substrate, coating it using a temperature-controlled doctor blade, then immersing the substrate in a coagulation bath, and after coagulation, washing and drying to obtain the PVDF ultrafiltration membrane. The ultrafiltration membrane has high flux and good retention rate, and also exhibits good temperature-sensitive response performance.

This invention discloses a low-temperature antifreeze and crack-resistant concrete and its preparation method, belonging to the field of concrete technology. The concrete comprises the following components: cementitious materials, sand, crushed stone, temperature-responsive modified bamboo aggregate, water-reducing agent, water, succinic anhydride, fucoidan, and rock wool fiber. The preparation method of the temperature-responsive modified bamboo aggregate is as follows: S1. N-isopropylacrylamide and dodecyl acrylate are dissolved in a solvent, and initiator one is added to carry out a polymerization reaction. After separation, a copolymer of N-isopropylacrylamide monomer is obtained; S2. The copolymer of N-isopropylacrylamide monomer is dissolved in a calcium citrate aqueous solution and stirred evenly to obtain a copolymer of N-isopropylacrylamide aqueous solution; S3. Bamboo aggregate, copolymer of N-isopropylacrylamide aqueous solution, crosslinking agent, and initiator two are mixed and reacted at 40-50℃ for 4-5 hours to obtain the final product. This invention improves the low-temperature crack resistance of concrete through the synergistic effect of succinic anhydride, fucoidan, temperature-responsive modified bamboo aggregate, and rock wool fiber.

This invention discloses a temperature-responsive hydrogel with a low critical solution temperature 37°C higher than physiological temperature. It is formed by the polymerization reaction of comonomers N-isopropylacrylamide, 1-pyrene methacrylate, and acrylic acid with a crosslinking agent initiated by a free radical initiator. This invention further provides an enzyme-carrying hydrogel prepared from the aforementioned temperature-responsive hydrogel and a carbon nanotube-enzyme-carrying hydrogel composite material. The carbon nanotube-enzyme-carrying hydrogel composite material of this invention is in a swollen state at physiological temperature, and its reversible swelling-contraction changes, regulated by near-infrared light, dynamically regulate the catalytic activity of biological enzymes. Furthermore, carbon nanotubes possess excellent conductivity, and changes in the microgel morphology promote electron transfer within the three-dimensional conductive framework of the composite material, thereby enhancing the electrochemical response. The carbon nanotube-enzyme-carrying hydrogel composite material of this invention can be used to construct intelligent sensors suitable for in vivo controlled analysis.

This invention belongs to the technical field of thermoelectric materials and functional polymer materials, specifically relating to a thermoelectric hydrogel based on the synergistic enhancement of zwitterionic and polar solvents, its method, and applications. The thermoelectric hydrogel is obtained by polymerizing a precursor solution to form a gel matrix, followed by immersion in an immersion solution to introduce a potassium ferrocyanide / potassium ferrocyanide redox couple. The precursor solution is prepared by mixing acrylamide, N-isopropylacrylamide, dimethyl sulfoxide, N,N-dimethylformamide, 1-ethyl-3-methylimidazolium tetrafluoroborate, the zwitterionic monomer [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide, the crosslinking agent N,N'-methylenebisacrylamide, a photoinitiator, and deionized water. This invention prepares a thermoelectric hydrogel with high mechanical strength, high ductility, and a high Seebeck coefficient, and also exhibits good temperature resistance.

The application discloses a kind of high-efficiency histidine-rich protein separation chromatography materials P (NIPAM-co-AAc)-PAMAM@Cu and preparation method thereof, belong to functional polymer chromatography material technical field;Its preparation method includes the following steps: with azobisdimethyl isobutyronitrile (AIBN) as initiator, N,N-methylene bisacrylamide (MBA) is used as crosslinking agent, N-isopropyl acrylamide (NIPAM) and acrylic acid (AAc) are used as monomer, polyamidoamine (PAMAM) is used as function group, prepare P (NIPAM-co-AAc)-PAMAM hydrogel, after chelation with copper nitrate, finally the chromatography material P (NIPAM-co-AAc)-PAMAM@Cu is prepared.The chromatography material prepared by the application, under certain conditions, the equilibrium adsorption capacity of BHb, BSA, Lyz is 646.23mg / g, 108.33mg / g and 56.24mg / g respectively, has the advantages of large adsorption capacity and high selectivity for histidine-rich protein;And the chromatography material has good separation performance and cyclic regeneration, provides a new way for the separation and purification of histidine-rich protein.

This invention provides a multifunctional seawater-resistant dressing and its preparation method. The dressing comprises, from bottom to top, a hemostatic and absorbent layer, an antibacterial layer, a waterproof self-adhesive layer, and a release layer. The hemostatic and absorbent layer is prepared from raw materials including a hemostatic agent, N-isopropylacrylamide, acrylic acid, and a crosslinking agent. The antibacterial layer is formed by electrospinning bismuth tungstate / silver bromide heterojunction nanoparticles and a polymer solution, with a material-to-liquid ratio of bismuth tungstate / silver bromide heterojunction nanoparticles to the polymer solution of 5:1 mg / mL. The dressing prepared by this invention effectively prevents seawater immersion and exhibits excellent hemostatic and antibacterial effects.

The application provides a polymer microsphere for profile control and flooding and a preparation method thereof. The preparation method comprises the following steps: preparing a first aqueous phase mixed solution by mixing acrylamide, N-isopropyl acrylamide and nanocellulose subjected to TEMPO oxidation modification; mixing an oil phase solvent and an emulsifier to obtain an oil phase solution; mixing a crosslinking agent, an initiator and the first aqueous phase mixed solution to obtain a second aqueous phase mixed solution; adding the second aqueous phase mixed solution into the oil phase solution, stirring at a first rotating speed for a first time, and then reacting under the condition of stirring at a second rotating speed for a second time to obtain a reacted emulsion system; and drying and forming the reacted emulsion system to obtain the polymer microsphere. The polymer microsphere for profile control and flooding is prepared by the preparation method. The polymer microsphere is a novel profile control agent, has good temperature resistance and salt resistance, has rigidity and flexibility, can enter the inside of an oil layer, and has good application in the field of profile control and water plugging.