17 results about "Tetramethylethylenediamine" patented technology

This invention relates to a method for preparing a broadband absorption hydrogel. The method comprises the following steps: S1, mixing solvent A (N,N-dimethylformamide or acetonitrile) with deionized water to obtain a mixed solvent; S2, adding polyethylene glycol methyl ether acrylate-480 and acryloylmorpholine to the solvent in S1 and dissolving them to obtain a mixed solution; S3, removing dissolved oxygen from the mixed solution in S2, sealing the container, and stirring under ice bath conditions; S4, adding potassium persulfate and N,N,N',N'-tetramethylethylenediamine to the mixed solution after stirring in S3, and sealing the container again; S5, completing the polymerization reaction in the container at 60 °C to obtain the hydrogel. Compared with the prior art, the hydrogel material provided by this invention has improved reflection loss intensity and effective absorption bandwidth performance, thus providing a new perspective for developing highly flexible and efficient electromagnetic wave absorbers.

This invention relates to the field of organic synthesis technology, specifically to a highly efficient and stable Grignard preparation and its green preparation method. By weight, it comprises 8-18 parts of a magnesium source, 40-92 parts of a halogenated hydrocarbon, 150-200 parts of a green solvent, 15-20 parts of ethylene glycol dimethyl ether, and 2.3-3.2 parts of a synergistic stabilizer. The green solvent is 2-methyltetrahydrofuran, or a composite solvent with a weight ratio of 2-methyltetrahydrofuran:methyl tert-butyl ether of 150-160:40-50. The synergistic stabilizer is composed of 1.5-2.0 parts of N,N,N',N'-tetramethylethylenediamine and 0.8-1.2 parts of butylated hydroxytoluene, or composed of 1.5-2.0 parts of N,N,N',N'-tetramethylethylenediamine and 1.0 part of phenothiazine. This invention uses a green solvent system to replace traditional toxic and harmful solvents, and combines it with a solvent recovery process to achieve solvent recycling, which greatly reduces waste emissions and makes the production process safer and more environmentally friendly, in line with the development direction of green chemical industry.

The present invention relates to a composition comprising at least one amine selected from the group consisting of N,N,N',N'-tetramethylethylenediamine, N,N,N',N'- tetramethylpropylenediamine, 1,8-diazabicyclo[5.4.0]undec-7-ene, N,N- dimethylethylenediamine, 4-methylmorpholine, dimethyl-(2-azidoethyl)amine and mixtures thereof; at least one organic solvent selected from the group consisting of acetonitrile, dimethyl isosorbide, acetone, dimethylsulfoxide, and mixtures thereof; and at least one carboxylic, nitrate, or sulfate salt of a transition metal; wherein the transition metal is completely dissolved in the composition. The invention also relates to hypergolic compositions and uses thereof.

This invention relates to DNA-functionalized thermosensitive phase transition polymers, their preparation methods, and applications, belonging to the interdisciplinary field of functional polymers and biomaterials. It aims to solve the technical problems of existing exosome separation methods, such as long processing time, low purity, high cost, and inability to specifically separate exosome subtypes. This invention provides a polymer prepared via free radical polymerization using N-isopropylacrylamide and acrylamide-modified DNA as monomers, and ammonium persulfate and tetramethylethylenediamine as initiators. This polymer exhibits reversible phase transition properties at physiological temperatures and is applied to the separation and detection of exosome subtypes. Specific capture and quantitative analysis are achieved through DNA recognition probes and fluorescently labeled antibodies. The polymer of this invention is simple to operate, quick to prepare, low in cost, and high in purity. It requires only a common centrifuge for non-destructive separation of exosomes and can integrate detection functions, providing technical support for diagnosis and detection.

This invention discloses a methyl β-cyanoethylsiloxane-polyethylene glycol copolymer, its preparation method, and its applications, relating to the fields of polymer materials and electrochemical technology. The preparation method of this copolymer is as follows: tetramethylethylenediamine is reacted with cuprous oxide under an inert atmosphere to obtain a catalyst; methyldichlorosilane and acrylonitrile are dissolved in solvent A, and the catalyst is added to carry out the reaction; polyethylene glycol is added to the reaction solution, and the reaction continues under concentrated sulfuric acid catalysis to obtain a crude product; solvent B is added to the crude product, followed by washing and vacuum drying to obtain the methyl β-cyanoethylsiloxane-polyethylene glycol copolymer. This invention effectively improves the interfacial stability of the electrolyte and the efficiency of interfacial ion transport, thereby enhancing the cycle and rate performance of lithium-ion batteries.

The application discloses a preparation method of a hydrogen peroxide and zinc ion double-response hydrogel precursor, and the method comprises the following steps: firstly, preparing a Fe-MOF suspension, and then mixing the Fe-MOF suspension with a buffer solution of acrylamide and N,N-methylene bisacrylamide, and a solution containing an oxidant and tetramethylethylenediamine to obtain a hydrogel precursor. Then, the hydrogel precursor is dried to obtain a hydrogel. The application further discloses the use of the hydrogel precursor and the hydrogel. According to the preparation method, the reaction time is short, the preparation method is simple, and the method has certain universality. The prepared hydrogel material has good mechanical properties, a large specific surface area, a three-dimensional network structure, good electrical conductivity, and the property of fast response to changes, and can be used in electrochemical sensors, and has wide application prospects in the fields of biological detection, disease diagnosis, food hygiene and the like.

The application relates to the technical field of organic synthesis, in particular to a catalyst for catalytic synthesis of N,N,N',N'-tetramethyl ethylenediamine and a preparation method and application thereof. The copper-nickel-cerium-zirconium catalyst is composed of CuO-NiO-CeO2-ZrO2; wherein the molar ratio of CuO, NiO, CeO2 and ZrO2 is (60-65):(5-25):(10-25):(1-10). The copper-nickel-cerium-zirconium catalyst provided by the application can efficiently catalyze the reaction of dimethylamine and ethylene glycol to prepare N,N,N',N'-tetramethyl ethylenediamine, the conversion rate of ethylene glycol can reach 99%, and the selectivity of N,N,N',N'-tetramethyl ethylenediamine can reach 90%.

The application belongs to the technical field of building materials, and particularly relates to a flexible and wear-resistant cement-based material and a preparation method and application thereof. The flexible and wear-resistant cement-based material comprises the following components in parts by mass: 10-15 parts of acrylamide monomer, 1-3 parts of borate crosslinking monomer, 0.2-0.5 parts of initiator, 150-200 parts of ordinary Portland cement, 100 parts of water, 0.1-0.3 parts of tetramethylethylenediamine, 15-30 parts of silica ash and 0.45-1.6 parts of polycarboxylic acid water reducer. The flexible and wear-resistant cement-based material has excellent wear resistance and elongation at break.

This invention provides an inverted perovskite solar cell, its fabrication method, a perovskite film composition, a crystallizing solvate, an electrical device, and its applications. The method includes: seeding crystals on a substrate with a crystallizing solvate before applying a perovskite precursor solution; the general formula of the crystallizing solvate is A. x PbX4·yDMSO, where A is a cation selected from the following substances: ethylenediamine, butanediamine, heptamethamine, phenylethylamine, piperazine, N,N'-dimethylethylenediamine, N-methylethylenediamine, N,N,N',N'-tetramethylethylenediamine, N,N,N'-trimethylethylenediamine, N,N-dimethylethylenediamine; X is selected from I ‑ ,Br ‑ Cl ‑ x is 1-2; y is 1-3. The PCE of the PSC of this invention reaches 26.13%, FF reaches 86.75%, and after 1000 hours of maximum power point tracking, it maintains 93% of the initial PCE and after 900 hours of isothermal heating at 85°C, it maintains 85% of the initial PCE.

This invention discloses a high-flocculation-strength sludge dewatering flocculant, its preparation method, and its application in sludge treatment, relating to the field of wastewater treatment technology. The flocculant prepared by this invention is composed of acrylamide, vinylphosphonic acid, N-vinylimidazolium copolymer, ferrous tartrate, tetramethylethylenediamine-copper coordinated cyclodextrin inclusion complex, basic magnesium sulfate whiskers, and diethylenetriaminepentamethylphosphonic acid grafted modified chitosan. The flocculant prepared by this invention can effectively form flocs during sludge dewatering, maintain filter cake water flow channels, reduce filtration resistance, improve dewatering efficiency, and trigger polymer chain degradation under reducing conditions, reducing environmental residues. The flocculant provided by this invention is suitable for the dewatering treatment of various types of sludge, including municipal sludge and industrial sludge.

This invention discloses a method for preparing a single-electrode wearable triboelectric nanogenerator based on a flexible hydrogel electrode of MXene. A mixed solution of acrylamide, tannic acid, and sodium alginate is prepared as a precursor solution A. An aqueous solution of MXene nanosheets is prepared as a dispersion solution B. Dispersion solution B is slowly added to precursor solution A. An initiator, ammonium persulfate, a crosslinking agent, N,N'-methylenebisacrylamide, and an accelerator, N,N,N',N'-tetramethylethylenediamine are added sequentially to the mixture. The mixture is then injected into a polytetrafluoroethylene mold, which is placed in an oven to allow it to stand and form a nascent gel. The nascent gel is removed from the mold and immersed in an anhydrous calcium chloride aqueous solution at room temperature to allow the carboxyl groups on the sodium alginate molecular chain to undergo ionic crosslinking with calcium ions in the solution. The gel is then removed from the anhydrous calcium chloride aqueous solution and rinsed to obtain an MXene-PAM-SA-TA composite hydrogel electrode. The surface of the MXene-PAM-SA-TA composite hydrogel electrode is reacted with a benzophenone-modified polydimethylsiloxane friction layer to fabricate a triboelectric nanogenerator.

This invention provides a method for preparing a self-driven flexible blade with antibacterial properties, comprising the following steps: Acrylamide and acrylic acid are taken in a molar ratio of 5:1; potassium persulfate is taken at 1% of the total weight of acrylamide and acrylic acid; a crosslinking agent, N,N,N',N'-tetramethylethylenediamine, sodium polyacrylate, and chitosan are added and mixed evenly in water; a mixture of Ti3C2TxMXene and TiO2 and copper sulfide nanoparticles are added and stirred evenly; after electrospinning, crosslinking is performed with dopamine and then with Fe... 3+ Ionic solutions and Cu 2+ The skin material is obtained by immersion in an ionic solution and then fixed onto the blade substrate material. The flexible blade obtained by this invention can achieve rapid, large-scale reversible self-driven deformation within a narrow temperature range, and also possesses excellent antibacterial properties, achieving inhibition rates of 92% and 94% against Escherichia coli and Staphylococcus aureus, respectively.

The application belongs to the technical field of self-humidifying membrane electrode, and relates to a proton conductive hydrophilic polymer for a self-humidifying membrane electrode and a preparation method and application thereof. The preparation method comprises the following steps: 2-acrylamido-2-methylpropanesulfonic acid, amino or hydroxyl-containing olefin monomer, potassium persulfate, tetramethylethylenediamine and N,N'-methylenebisacrylamide are dissolved in water according to a molar ratio of 1:(0.05-0.15):(0.001-0.004):(0.002-0.01):(0.04-0.14) and uniformly mixed; the mixed solution is reacted at 50-70 DEG C for 6-12 h to obtain a crosslinked polymer; the crosslinked polymer is filtered, washed and dried, and the hydrophilic polymer is obtained; the amino or hydroxyl-containing olefin monomer is at least one of methacrylamide, hydroxyethyl methacrylate and hydroxypropyl methacrylate. The side chain of the hydrophilic polymer is rich in sulfonic acid groups and amino / hydroxyl groups, and the hydrophilic polymer has good hydrophilicity and proton conductivity.

This application belongs to the field of lithium battery technology, and particularly relates to electrolyte films and their preparation methods, and lithium batteries. The method includes: dissolving hexadecylpyridine chloride in deionized water, adding methyltrimethoxysilane, and stirring in ice water to obtain a pyridinesilane solution; adding glacial acetic acid to the pyridinesilane solution and stirring until the silane is hydrolyzed to obtain a precursor solution; adding an oxide electrolyte and BaTiO3 to the precursor solution to obtain a first mixed slurry; adding acetone or dichloromethane to the first mixed slurry to obtain a second mixed slurry; coating the second mixed slurry onto a polytetrafluoroethylene plate and immersing it in an alkaline solution to obtain a film plate, wherein the alkaline solution is formed by dissolving cooled N,N,N',N'-tetramethylethylenediamine in deionized water; subjecting the immersed film plate to vacuum baking, immersing and cleaning with anhydrous ethanol, and then vacuum baking again to obtain an electrolyte film with a skeleton structure; improving ionic conductivity; enhancing flame retardancy, mechanical strength, and the safety of lithium batteries.

The application discloses a kind of porous aerogel-based composite moisture-absorbing materials and its preparation method and application, belong to chemical and environmental technical field.The cellulose, sodium hydroxide, deionized water are mixed to obtain solution A;Methyl methacrylate sulfonic acid sodium, polyacrylamide, deionized water and N, N'-methylene bisacrylamide are mixed uniformly, then heated, ammonium persulfate is added to obtain solution B.A and B are mixed, and tetramethyl ethylenediamine is added to obtain gel precursor, which is pre-frozen, vacuum freeze-dried to obtain CSPA aerogel.CSPA-LiCl aerogel is obtained by immersing it in LiCl solution and freeze-drying again;The surface is repeatedly sprayed with pyrrole-isopropyl alcohol solution and ammonium persulfate solution in turn, and CSPA-LiCl-PPy aerogel is obtained after reaction and freeze-drying.The porous aerogel moisture-absorbing material is used for solar-driven atmospheric water collection.Compared with traditional electrically-driven fresh water collection technology, the solar desorption system significantly reduces energy consumption and operating cost, providing a low-cost, high-efficiency and environmentally friendly fresh water supply solution for arid regions.

This invention discloses a method for preparing a multi-responsive self-healing gel, comprising the following steps: firstly, synthesizing 4-hydroxyazobenzene, the azobenzene crosslinking agent shown in formula (1), and the 3-acrylamidophenylboronic acid functional monomer; then, dissolving β-cyclodextrin and 3-acrylamidophenylboronic acid in an alkaline solution, sequentially adding the compound of formula (1) and the acrylamide monomer, and finally, performing free radical polymerization at room temperature under the action of an oxidation-reduction initiation system composed of ammonium persulfate and tetramethylethylenediamine to obtain the gel. The preparation conditions of this invention are mild and the operation is simple. The resulting gel can undergo reversible gel-sol phase transition under ultraviolet / visible light irradiation, pH changes, or temperature rises and falls, while exhibiting good self-healing properties, sensitive response, and good cycle stability. It has broad application prospects in the fields of drug controlled release, biosensing, and intelligent actuators.

This invention discloses a method for preparing a quaternary ammonium-based hydrogel and its application in removing perchlorate from water, belonging to the field of water quality monitoring and treatment. The method for preparing the quaternary ammonium-based hydrogel includes step S1: dissolving N,N'-methylenebisacrylamide in deionized water, adding 2-(methacryloyloxy)ethyltrimethylammonium chloride, shaking until completely dissolved, and carrying out a cross-linking reaction in water; step S2: adding a catalyst and an initiator sequentially to the resulting dissolved solution, initiating a free radical polymerization reaction by vortexing, and then solidifying at room temperature (25°C) for 24 hours to obtain the quaternary ammonium-based hydrogel. The cross-linking reaction is carried out by cross-linking N,N'-methylenebisacrylamide and 2-(methacryloyloxy)ethyltrimethylammonium chloride in water in a specific ratio. After the cross-linking reaction is completed, tetramethylethylenediamine and potassium persulfate are added sequentially. This adsorbent can efficiently adsorb perchlorate in water.