36 results about "Biphenylamine" patented technology

The invention discloses a method for constructing a dual-mode sensor through smartphone-assisted surface molecular imprinting for detecting diphenyl phosphate and application of the dual-mode sensor, and belongs to the technical fields of biochemical analysis, functional nano materials and life science. In synthesis, solubility and selectivity of a target object and photo-initiation efficiency in a polymerization process are optimized, and diphenyl phosphate molecularly imprinted nano-enzyme MIPs is rapidly prepared through a molecular imprinting technology; in the detection, H2O2 and 3, 3, 5, 5-tetramethyl benzidine TMB are catalyzed by peroxidase-like activity of Fe and N-CDs to generate a chromogenic reaction and an inner filter effect of oxTMB is used for inhibiting a fluorescence signal, dual-signal cross validation is realized in cooperation with a smart phone, and the colorimetric-fluorescence sensor for detecting diphenyl phosphate is constructed. The sensor has specific recognition selectivity and binding affinity of diphenyl phosphate, is simple to operate and low in cost, can realize sensitive detection of diphenyl phosphate in a wide linear range, has the detection limit as low as 16 pg / mL, and is suitable for field analysis of trace DPhP in a complex water environment.

The invention discloses a method for detecting aflatoxin B1 in coffee based on colorimetric and photo-thermal dual modes of MXene (at) Pt nano-enzyme, which comprises the following steps: etching Ti3AlC2 by using LiF and HCl to obtain MXene, synthesizing platinum nano-particle modified MXene nano-enzyme (MXene (at) Pt) by using dopamine carbon dots and sodium borohydride as reducing agents and adopting an in-situ reduction technology, and detecting aflatoxin B1 in coffee by using the MXene (at) Pt nano-enzyme (MXene (at) Pt nano-enzyme (MXene (at) Pt nano-enzyme (MXene (at) Pt nano-enzyme (MXene (at) Pt). The MXene (at) Pt shows near-infrared light stimulation enhanced peroxidase-like activity and photo-thermal performance and can catalyze blue deepening and temperature rising of a substrate 3, 3 ', 5, 5'-tetramethyl benzidine (TMB), when aflatoxin B1 exists, POD-like activity of MXene (at) Pt nano-enzyme is inhibited, and colorimetric and temperature signals are reduced; a method for detecting the AFB1 by the colorimetric temperature dual-mode sensor is established, and the method has the characteristics of high sensitivity, strong specificity, simplicity and rapidness in operation and the like.

This application relates to a terphenylamine skeleton compound, its preparation method, and its application, belonging to the field of chemical synthesis technology. The preparation method of the terphenylamine skeleton compound of this application includes the following steps: dissolving 2,4,6-triphenylaniline with thiazole-4-carboxaldehyde or thiophene-3-carboxaldehyde in a solvent, conducting a reductive amination reaction under reducing agent conditions, quenching, extraction, washing, concentration to remove solvent, and purification to obtain the terphenylamine skeleton compound. This application provides a simple and mild synthetic method for the natural active products 5'-phenyl-N-(thiazol-4-ylmethyl)-[1,1':3',1''-terphenyl]-2'-amine and 5'-phenyl-N-(thiophene-3-ylmethyl)-[1,1':3',1''-terphenyl]-2'-amine, which can only be extracted from the secondary metabolites of the marine fungus Aspergillus sp. Furthermore, this method utilizes widely available raw materials, which is beneficial for large-scale industrial production of these natural active products.

A dichroic bis-azo biphenyl dye of the following formula:The substituents R1, R2, R3, R4 are alkyl (CnH2n+1) or alkenyl (CnH2n−1) groups with n=1-18. At least one substituent among R1R2R3R4 is different from the other substituents. A benzidine-free method of making a dichroic bis-azo biphenyl dye is provided in which the biphenyl portion of the dye is formed from different first and second mono-azo dyes by a cross-coupling reaction, which may be a Suzuki reaction. A polarizer is formed from a photoaligned layer of the bis-azo biphenyl dye on a substrate and exhibits a dichroic ratio of at least 40. Chemical modification of the photoaligned bis-azo biphenyl dye layer creates a broad-band thin film polarizer with low light scattering and high thermal and photo tolerances.

A resin composition contains a polyimide precursor and a solvent. The polyimide precursor is a copolymer of a tetracarboxylic dianhydride component and a diamine component containing pyromellitic dianhydride and 3,3',4,4'-biphenyltetracarboxylic dianhydride as tetracarboxylic dianhydride components and 2,2'-bis(trifluoromethyl)benzidine as a diamine component. The weight average molecular weight of the polyimide precursor is 260,000-1,000,000, and the concentration of the polyimide precursor in the resin composition is 5-20 mass%.

The invention relates to the technical field of harmful substance detection, in particular to a three-channel colorimetric sensor for simultaneously detecting aflatoxin and a precursor thereof as well as a preparation method and application of the three-channel colorimetric sensor. According to the method, COFFe / NiP-Ph is utilized for catalyzing 3, 3 ', 5, 5'-tetramethylbenzidine (TMB) to be oxidized to generate blue oxTMB, o-phenylenediamine (OPD) is utilized for generating yellow oxOPD, and then the aflatoxin and the precursor thereof are detected through a three-channel colorimetric sensor. Purple ox4-AT is generated by using a mixture of N-ethyl-N-(3-sulfopropyl)-3-methylaniline sodium and 4-aminoantipyrine (4-AT), so that the colorimetric response is realized in a short time. The preparation method of the COFFe / NiP-Ph nano enzyme comprises the following steps: 1, a synthesis process of Fe-TAPP; 2, synthesis of Ni-TAPP is carried out; and 3, synthesizing the iron / nickel porphyrin covalent organic framework. The colorimetric sensor can be prepared into a detection reagent or a kit so as to realize qualitative and quantitative detection of aflatoxin and a precursor thereof in a sample to be detected. The detection method is simple and convenient to operate, and complex pretreatment on a to-be-detected sample is not needed; the detection cost is low, the detection is quick, and the requirement on a detection instrument is low.

The invention relates to a preparation method of furan-containing polybenzimidazole (PBI), in particular to a method for preparing furan-containing polybenzimidazole (PBI) by using bio-based furandicarboxylic acid (FDCA) as a diacid monomer instead of a traditional petroleum-based monomer and by using specific aromatic tetramine including 3, 3 ', 5'-tetracarboxylic acid (FDCA) as a diacid monomer. The novel polybenzimidazole polymer is synthesized by the following steps of: reacting 3, 3 '-diaminobenzidine, 3, 3', 4, 4 '-tetraamino diphenyl ether or 3, 3', 4, 4 '-tetraamino diphenyl sulfone at 150-160 DEG C for 2-4 hours under the protection of nitrogen in the presence of an ionic liquid solvent and a dehydrating agent phosphorus pentoxide, and reacting at 165-215 DEG C for 4-30 hours. The invention solves the problems of high processing difficulty, high cost and fossil raw material dependence of the traditional petroleum-based PBI.

The application discloses a method for colorimetric and photothermal dual-mode detection of aflatoxin B1 in coffee based on MXene@Pt nanozyme, wherein MXene is obtained by etching Ti3AlC2 with LiF and HCl, dopamine carbon dots and sodium borohydride are used as reducing agents, and in-situ reduction technology is adopted to synthesize MXene nanozyme modified with platinum nanoparticles (MXene@Pt). The MXene@Pt shows peroxidase-like activity and photothermal performance enhanced by near-infrared light stimulation, can catalyze the blue deepening of the substrate 3,3',5,5'-tetramethylbenzidine (TMB) and temperature rise, and when aflatoxin B1 exists, the POD-like activity of the MXene@Pt nanozyme is inhibited, and the colorimetric and temperature signals are reduced. The colorimetric and temperature dual-mode sensor detection method for AFB1 is established, and the method has the characteristics of high sensitivity, strong specificity, simple operation, rapidness and the like.

The invention relates to the technical field of wastewater treatment, and discloses a wastewater treatment adsorbent and a preparation method thereof.Acrylic acid, acrylamide and 4-vinylbenzaldehyde dihydroxybenzidine Schiff base are subjected to cross-linking polymerization to obtain a hydrogel-based wastewater treatment adsorbent, a large number of benzene rings are introduced into a hydrogel skeleton, and the hydrogel-based wastewater treatment adsorbent is prepared. The rigidity of the hydrogel is enhanced, and the tensile strength and the mechanical property are improved. The hydrogel-based wastewater treatment adsorbent contains a plurality of o-hydroxyl Schiff base structures and can form a coordination effect with metal ions such as lead, the adsorption performance of the hydrogel on the metal ions such as lead is improved, meanwhile, phenolic hydroxyl groups in the hydrogel, phenolic hydroxyl groups of phenol and N atoms of 4-vinyl imidazole can form hydrogen bonds and other interactions, and the adsorption performance of the hydrogel on the metal ions such as lead is improved. A synergistic adsorption effect is achieved with carboxyl and amido bonds in the hydrogel, so that the adsorption strength of metal ions and organic pollutants in the hydrogel is remarkably enhanced, and a higher removal rate is shown.

This invention provides a multilayer polyimide film with excellent heat resistance, low dielectric loss tangent, and dimensional stability. The multilayer polyimide film comprises a heat-resistant polyimide layer and a heat-fusion polyimide layer laminated on one or both sides; the heat-resistant polyimide is obtained from a tetracarboxylic acid component containing more than 75 mol% of 3,3',4,4'-biphenyltetracarboxylic dianhydride (s-BPDA) and less than 25 mol% of pyromellitic dianhydride (PMDA), and a diamine component containing 70 mol% to 95 mol% of p-phenylenediamine and 5 mol% to 30 mol% of 2,2'-dimethylbenzidine; the heat-fusion polyimide is obtained from a tetracarboxylic acid component containing 10 mol% to 60 mol% of s-BPDA and 40 mol% to 90 mol% of PMDA, and a diamine component containing more than 50 mol% of 2,2-bis[4-(4-aminophenoxy)phenyl]propane.

The invention discloses pigment yellow 83 and a preparation method thereof, and relates to the technical field of pigments, in the pigment yellow 83, 3, 3 '-dichlorobenzidine is taken as a diazo component and is coupled with acetyl-4-chloro-2, 5-dimethoxyaniline, and modified rosin prepared by copolymerization of rosin, monoethyl maleate and cetyl alcohol is introduced in the later stage of reaction; and then mixing with calcium chloride and other raw materials. Carboxyl and long-chain alkyl are introduced into the modified rosin, so that hydrophilic-hydrophobic balance of the surface of the pigment is realized, and compatibility and dispersion stability with a coating system are enhanced; the calcium chloride can promote the pigment to be separated out from a water phase to form solid particles and can be further combined with carboxyl in the modified rosin, so that particle aggregation is inhibited, and the solubility of the modified rosin in pigment molecules is improved. The pigment yellow 83 has the advantages of being good in hydrophobic performance, coloring strength and dispersing performance.

The invention relates to the technical field of ternary organic solar cells, in particular to a high-efficiency ternary organic solar cell active layer and a preparation method thereof.A modular monomer library containing a p-benzoquinone-benzidine structure is constructed, the monomer library comprises three monomers M1, M2 and M3, third components P1, P2 and P3 are synthesized through functional group regulation and control and a one-step polymerization process, and the third components P1, P2 and P3 are synthesized through a one-step polymerization process; a ternary blending active material for constructing an intermediate coating of a device is prepared, in a final assembly structure of the device, the upper layer is PNDIT-F3N, the middle layer is a ternary active layer obtained by blending P1, P2, P3, D18 and L8-BO, and the lower layer is PEDOT: PSS. Through structural regulation and control of a dynamic adjustable monomer library, one-step synthesis of three differentiated third components is realized, and the preparation process is simple and convenient. Complex modification or noble metal catalysts are not needed, so that the cost is reduced.

The application discloses a diphenylamine-based organic solvent composite nanofiltration membrane and a preparation method thereof, and belongs to the technical field of separation membranes. The diphenylamine-based organic solvent composite nanofiltration membrane is prepared by the following steps: taking polyacrylonitrile or polyimide ultrafiltration membrane as a base film, removing a surface pore preserving agent, immersing in an aqueous solution containing a 2,2'-diphenylamine-based compound, then immersing in an organic solution containing a polybasic acid chloride to perform an interfacial polymerization reaction, and finally performing a heat crosslinking post-treatment to obtain the composite nanofiltration membrane. The prepared composite nanofiltration membrane has an about 8 times flux increase compared with a traditional polyamide membrane due to the introduction of the rigid twistable monomer diphenylamine-based compound, and the selectivity of the prepared composite nanofiltration membrane to organic small molecule dyes is not obviously reduced. Meanwhile, the prepared composite nanofiltration membrane has high stability in tests of various polar solvents, and therefore has high economic value in separation of organic solvent systems in the industry.

The invention belongs to the technical field of oil exploitation, and particularly relates to an oil-displacing agent for improving the recovery efficiency and a preparation method and application thereof. The preparation method comprises the following steps: adding 5-aminoisophthalic acid, first DMF (Dimethyl Formamide) and triethylamine into a reactor, cooling, slowly dropwise adding first malonyl chloride, and continuously reacting; dissolving benzidine disulfonic acid in second DMF, dropwise adding into the reactor, and continuously reacting; dropwise adding second malonyl chloride into the reactor, and continuously reacting; dissolving fatty amine in third DMF, dropwise adding into the reactor, and continuously reacting; and carrying out heating dissolution, cooling, solid precipitation, centrifugation and drying so as to obtain the product oil-displacing agent. The oil-displacing agent disclosed by the invention has the characteristics of high interfacial activity, good emulsifying effect and strong anti-shearing capability.

A chlorine detection test paper includes a carrier and a chlorine detection substance provided on the carrier, wherein the chlorine detection substance contain a color developer which includes one or more of DPD, tetramethylbenzidine, syringaldehyde azine, and vanillin azine.

This invention belongs to the field of nanocomposite materials technology, specifically disclosing a cobalt / boron / nitrogen co-doped carbon nanosphere membrane modification material, its preparation method, and its application. The preparation method includes the following steps: S1, adding 3,3'-diaminobenzidine, Pluronic F-127, cobalt source, zinc borate, and p-benzoquinone sequentially to an ethanol solution in proportion, reacting, filtering, and washing to obtain a brown solid; S2, drying the brown solid obtained in S1, and then subjecting it to pyrolysis to obtain the Co@BNG-CNSs membrane modification material. This invention, using the aforementioned cobalt / boron / nitrogen co-doped carbon nanosphere membrane modification material, its preparation method, and its application, constructs a high-speed electron transport channel from the metal core to the reaction interface, greatly accelerating the liquid-liquid and liquid-solid conversion kinetics of LiPSs, ultimately achieving long-term cycle stability and extended lifespan of lithium-sulfur batteries.

The application discloses a Hg 2+ and Cd 2+ differential detection and adsorption removal method, and a zinc-based metal organic framework loaded with silver nanoparticles (ZIF-AgNPs) is prepared by an in-situ reduction method, has oxidase-like activity, and can catalyze color development of 3,3',5,5'-tetramethylbenzidine (TMB). 2+ or Cd 2+ can destroy the ZIF structure and inhibit the activity, and makes the system fade. By utilizing the differential response of the two ions to pH, a multi-channel colorimetric array is constructed, and machine learning is combined to realize classification identification and quantitative detection of the two ions. Meanwhile, the material can efficiently adsorb and remove heavy metal ions in water through coordination, integrates visual detection, intelligent identification and adsorption, and can be widely applied to the fields of environmental monitoring, food safety detection and heavy metal pollution treatment.

The invention discloses a beta-keto-enamine magnetic covalent organic framework as well as a preparation method and application thereof, and the beta-keto-enamine magnetic covalent organic framework is prepared by the following steps: preparing a magnetic material from NH2-Fe3O4, trialdehyde phloroglucinol, benzidine and the like as raw materials, carrying out sealing and heating reaction under a vacuum condition by using pyrrolidine as a catalyst, washing the obtained precipitate, and carrying out Soxhlet extraction and drying to obtain the beta-keto-enamine magnetic covalent organic framework. The beta-keto-enamine magnetic covalent organic framework material is highly crystallized, the specific surface area and the porosity are greatly improved, and the adsorption performance of polycyclic aromatic hydrocarbon in edible vegetable oil can be greatly improved by using the beta-keto-enamine magnetic covalent organic framework material as a magnetic solid-phase adsorbent, so that the detection recovery rate is improved; the beta-keto-enamine magnetic covalent organic framework material disclosed by the invention can still maintain relatively high adsorption performance after being recycled for multiple times, and shows good stability and recycling performance.

The invention relates to a novel polybenzimidazole (PBI) polymer and a preparation method thereof. In particular provides an aromatic diacid monomer 5, 5 '-(9, 9'-spirobifluorene-2, 7-diyl) bipicolinic acid containing a pyridine and spirobifluorene twisted structure, and the structural formula of the aromatic diacid monomer 5, 5 '-(9, 9'-spirobifluorene-2, 7-diyl) bipicolinic acid is as follows: the monomer and aromatic tetramine (such as 3, 3 '-diaminobenzidine) are subjected to polycondensation in polyphosphoric acid (PO is greater than or equal to 85%) to obtain a PBI polymer with a main chain containing the pyridine and spirobifluorene twisted structure. The polymer is completely dissolved in NMP, DMSO and DMF, keeps high thermal stability, solves the problem of poor processability of traditional PBI, and is suitable for fuel cell proton exchange membranes and high-temperature-resistant engineering materials.

A polyimide film and a method for producing the same, said polyimide film containing a polyimide resin having: a structure derived from an acid component, said structure containing a structure derived from a pyromellitic acid derivative and a structure derived from a 3,3',4,4'-biphenyltetracarboxylic acid derivative; and a structure derived from an amine component, said structure containing a structure derived from a 2,2'-bis(trifluoromethyl) benzidine derivative, wherein the yellowness index (15 μｍ film thickness equivalent), the haze, the 1% weight loss temperature, the average coefficient of linear expansion between 50°C and 200°C, and the tensile elongation, are within specific ranges.

The invention discloses a Prussian blue nano-enzyme based on a molecular imprinting technology, a preparation method of the Prussian blue nano-enzyme and application of the Prussian blue nano-enzyme to detection of small extracellular vesicles. The nano enzyme disclosed by the invention can be used for effectively enriching small extracellular vesicles (sEVs) and simultaneously realizing the detection of three proteins, namely CD20, CD19 and PD-L1. The Fe3O4-coated TiO2 magnetic beads are combined with phosphate groups in the sEVs phospholipid bilayer, and effective separation of the Fe3O4-coated TiO2 magnetic beads and a complex sample is achieved under the action of an external magnetic field. The molecularly imprinted nano enzyme PB-MIP-PEG has excellent peroxidase activity, and shows specific binding capacity to 3, 3 ', 5, 5'-tetramethyl benzidine (TMB), so that the catalytic efficiency is enhanced, and non-specific adsorption is reduced.

The application discloses a covalent organic framework material, a solid-phase microextraction probe and a preparation method and application thereof, and relates to the technical field of material preparation and component detection. The application adopts 3,3'-dihydroxydiphenylamine and 1,3,6,8-tetra(4-formaldehyde phenyl) perylene as synthetic monomers, and synthesizes Py-DHBD-COF through a solvothermal method. The synthetic material is coated on the surface of an acid-etched stainless steel wire through polyacrylonitrile glue, and a solid-phase microextraction probe modified with a Py-DHBD-COF coating is prepared. The Py-DHBD-COF coating forms hydrogen bonds, pi-pi stacking and hydrophobic interaction with psychotropic drugs through its pi conjugated system, imine bonds and hydroxyl groups, so that efficient and selective adsorption of various psychotropic drugs is realized. In combination with HPLC-MS / MS technology, the probe shows high sensitivity, a wide linear range and good precision in the detection of three kinds of psychotropic drugs.

The invention relates to the technical field of curing agent preparation, in particular to a preparation method of a heat-resistant polyamide epoxy curing agent, which comprises the following steps: S1, under the protection of inert gas, adding epoxy resin and 3-aminopropyltrimethoxysilane into absolute ethyl alcohol, reacting, then adding methacryloxypropyltrimethoxysilane and ammonia water, heating, reacting, and cooling to room temperature to obtain epoxy resin; modified epoxy resin is obtained; s2, adding benzidine into glacial acetic acid, then adding the modified epoxy resin obtained in the step S1, and reacting to obtain an intermediate; and S3, reacting the intermediate obtained in the step S2 with organic amine to obtain the polyamide epoxy curing agent. The polyamide epoxy curing agent prepared by the invention has good heat resistance, and the flexibility of epoxy resin obtained by curing is not influenced.

The application provides a polyimide adhesive film, a preparation method and application thereof. The polyimide adhesive film comprises the following components in parts by weight: 100 parts of a polyimide resin matrix; and, based on 100 parts of the polyimide resin matrix, 50-80 parts of a copolymer modifier, wherein the copolymer modifier comprises one or more of an epoxy-based diamine, p-aminoaniline, p-hydroxyaniline, allyl bisphenol A and hyperbranched siloxane; 4-35 parts of a toughening agent; and 40-100 parts of a special resin, wherein the special resin has a thermal decomposition temperature greater than or equal to 250 DEG C. The polyimide adhesive film has excellent bonding strength and anti-creep capacity at high temperatures, and can reduce the cost of the polyimide adhesive film.

The invention provides a colorimetric / photo-thermal dual-mode sensor, a preparation method thereof and application of the colorimetric / photo-thermal dual-mode sensor in hydrogen peroxide detection. The colorimetric / photo-thermal dual-mode sensor comprises a metal organic framework (PDA at Fe / Zr-MOF) with the surface wrapped with polydopamine and a chromogenic substrate 3, 3 ', 5, 5'-tetramethyl benzidine (TMB); when hydrogen peroxide exists in a system, the PDA at Fe / Zr-MOF can catalyze colorless TMB to be oxidized into blue ox TMB, an ultraviolet absorption peak is generated at 652 nm, strong photo-thermal conversion is achieved under irradiation of 808 nm infrared laser, and a colorimetric / photo-thermal dual-mode sensor can be formed. According to the invention, the excellent catalytic ability of the nano-enzyme and the photo-thermal conversion characteristic of PDA are integrated in one system, so that high-sensitivity hydrogen peroxide detection is realized.

This invention relates to a multi-color electrochromic device and its fabrication method. The multi-color electrochromic device has a five-layer structure, consisting of a first ITO conductive glass, a first electrochromic layer, an electrolyte layer, a second electrochromic layer, and a second ITO conductive glass. The first electrochromic layer comprises surfactant I and poly(3,4-ethylenedioxythiophene); the second electrochromic layer comprises surfactant II and a polytetraphenylbenzidine derivative. By utilizing the color characteristics exhibited when the first and second electrochromic layers undergo redox reactions at different voltages, the electrochromic device achieves multiple color transitions from transparent to blue, black, and green, ultimately returning to transparent. This device can be widely used in applications such as solar panels for new energy vehicles and smart photochromic glasses.

The application discloses a preparation method of a branched sulfonated polyimide film, which comprises the following steps: preparing 1,3,5-tri(4-naphthoxy-1,8-dioic acid) benzene trianhydride, using the 1,3,5-tri(4-naphthoxy-1,8-dioic acid) benzene trianhydride as raw material, and adding 4,4'-diamino diphenyl, 2,2'-disulfonic acid benzidine, triethylamine and benzoic acid to obtain a triethylamine salt type branched sulfonated polyimide film; soaking the triethylamine salt type branched sulfonated polyimide film in anhydrous ethanol, then soaking the triethylamine salt type branched sulfonated polyimide film in a sulfuric acid aqueous solution, and then washing the triethylamine salt type branched sulfonated polyimide film with deionized water to obtain a branched sulfonated polyimide film, and storing the branched sulfonated polyimide film. The branched sulfonated polyimide film prepared by the application has good performance and is suitable for a full vanadium redox flow battery.

This invention provides a colorimetric / photothermal dual-mode sensor, its preparation method, and its application in hydrogen peroxide detection. The colorimetric / photothermal dual-mode sensor comprises a metal-organic framework (PDA@Fe / Zr-MOF) coated with polydopamine and a chromogenic substrate 3,3',5,5'-tetramethylbenzidine (TMB). In the presence of hydrogen peroxide, the PDA@Fe / Zr-MOF catalyzes the oxidation of colorless TMB to blue ox TMB, producing an ultraviolet absorption peak at 652 nm and exhibiting strong photothermal conversion under 808 nm infrared laser irradiation, thus constituting a colorimetric / photothermal dual-mode sensor. This invention integrates the excellent catalytic ability of nanozymes with the photothermal conversion characteristics of PDA into a single system, achieving highly sensitive hydrogen peroxide detection.