46 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 relates to a diatomic catalyst for detecting carbosulfan pesticide residue and a preparation method, and belongs to the technical field of food safety detection. According to the invention, a reducing sulfide generated by breaking a nitrogen-sulfur (N-S) bond of carbosulfan under an acidic condition is used as a specific substance. The reductive sulfide not only can prevent bimetal active sites in the diatomic catalyst, but also consumes hydroxyl radicals generated by catalyzing hydrogen peroxide (H2O2), and the sensing switch enzyme formed by a dual enzyme inhibition mechanism causes the enzyme substrate 3, 4-dihydroxyl-3, 4-dione to be converted into the diatomic catalyst, so that the catalytic activity of the diatomic catalyst is improved. The blue color of the 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) gradually becomes light along with the increase of the concentration of carbosulfan, sensitive visual detection is implemented, and after a blue product is read by using an ultraviolet spectrophotometer, the absorbance value generated by an ultraviolet absorption spectrum at 654 nm is linearly dependent on carbosulfan. The prepared diatomic catalyst effectively improves the detection sensitivity of the carbosulfan pesticide residue, and has good popularization and application prospects.

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 present invention discloses the use of a copper-iron bimetallic oxide in the colorimetric detection of hexavalent chromium. The present invention utilizes a coprecipitation method to synthesize the copper-iron bimetallic oxide in a single step. This inexpensive and readily available copper-iron bimetallic oxide can highly selectively catalyze the Cr(VI) and 3,3',5,5'-tetramethylbenzidine (TMB) system to produce a visual blue color. Within a certain concentration range, the depth of the blue color is proportional to the Cr(VI) concentration, thus establishing a new colorimetric method for the detection of Cr(VI). In this system, the linear range for Cr(VI) detection is 0.3 μmol / L to 26 μmol / L, with a detection limit of 0.17 μmol / L. The system can be used for the detection and analysis of Cr(VI) in the environment and food.

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 invention relates to a cross-linked polyimide aerogel and a normal pressure drying preparation method thereof, and the preparation method comprises the following steps: taking 2, 2 '-dimethyl benzidine and 3, 3', 4, 4 '-biphenyl tetracarboxylic dianhydride as raw materials, cross-linking through 1, 3, 5-tri (4-aminophenoxy) benzene to prepare cross-linked polyimide, and drying under a normal pressure condition to obtain the cross-linked polyimide aerogel. The production difficulty of the cross-linked polyimide aerogel can be reduced, and a new thought is provided for preparation of the cross-linked polyimide aerogel.

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.

This invention provides an energy-storing, luminescent phase-change hot-melt road marking material and its preparation method, made from the following raw materials: C5 petroleum resin, glass microspheres, silane coupling agent, polyoxymethylene, polyoxyethylene, sodium sulfate, multi-walled carbon nanotubes, expanded graphite, oligomeric dopamine, isophorone diisocyanate, tetraethylenepentamine, perhydropolysilazane, N,N,N',N'-tetramethylbenzidine, 2,8-bis(diphenylphospho)dibenzo[b,d]thiophene, silica aerogel powder, nano-titanium dioxide powder, calcium carbonate powder, barite powder, lauric acid, palmitic acid, hexadecyltrimethylammonium bromide, polyethylene glycol octylphenyl ether, dioctyl phthalate, and acetic acid. While ensuring the visibility and durability of the road markings, this invention reduces high-temperature deformation and low-temperature cracking of the hot-melt road markings, minimizes the propagation of internal cracks, increases the service life of the hot-melt road markings, and reduces maintenance and repainting costs.

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.

The invention provides a donor-acceptor type covalent organic framework material B-COF photocatalyst and application thereof in synthesis of benzonitrile derivatives, and belongs to the technical field of catalytic chemistry. The B-COF can be prepared through solvothermal condensation of 2, 4, 6-triformyl phloroglucinol and a benzidine derivative, and is characterized in that a [100] crystal face diffraction peak appears at a position where 2theta is equal to 3.46 degrees in XRD (X-Ray Diffraction). The material can efficiently catalyze conversion from aromatic aldoxime to a benzonitrile derivative under light irradiation, and the thermal stability of the material is obviously superior to that of a traditional photocatalyst. According to the B-COF photocatalyst and the catalytic system thereof developed by the invention, the efficiency and the selectivity of photocatalytic organic conversion reaction are remarkably improved, and a new technical scheme is provided for developing an environment-friendly and sustainable chemical synthesis method.

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.

The present invention provides a yttrium-based metal-organic framework material with selective fluorescence recognition for nitrofurazone, and its preparation method and application. The preparation method of the yttrium-based metal-organic framework material of the present invention includes the steps of: fully mixing and dispersing yttrium nitrate, tris(3'-F-4-carboxybiphenyl)amine, N,N-dimethylformamide, methanol, acetic acid and water evenly; carrying out a solvothermal reaction, and then filtering, washing and drying to obtain the yttrium-based metal-organic framework material. The yttrium-based metal-organic framework material obtained in the present invention has high sensitivity and selective recognition for nitrofurazone, and has potential application value in fluorescence recognition. The yttrium-based metal-organic framework material of the present invention has excellent photothermal stability and solvent stability, and its fluorescence effect is strong. The present invention uses polymethyl methacrylate and the yttrium-based metal-organic framework material to prepare a more convenient and rapid detection film, which can be used for visual and simple detection.

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 present invention discloses a preparation method of a poly-Schiff base-nickelocene composite material, comprising the following steps: (1) respectively adding 3,3'-diaminobenzidine, 4,4'-biphenyldicarboxaldehyde, and nickelocene to anhydrous ethanol to form an anhydrous ethanol solution of 3,3'-diaminobenzidine, an anhydrous ethanol suspension of 4,4'-biphenyldicarboxaldehyde, and an anhydrous ethanol solution of nickelocene; (2) adding the anhydrous ethanol suspension of 4,4'-biphenyldicarboxaldehyde to the anhydrous ethanol solution of 3,3'-diaminobenzidine, adding the anhydrous ethanol solution of nickelocene thereto before generating a precipitate, and stirring for 5-6 hours; (3) filtering by suction, washing with anhydrous ethanol, and drying the obtained precipitate to obtain the poly-Schiff base-nickelocene composite material. The poly-Schiff base-nickelocene composite material prepared by the present invention has a large specific surface area, good electrical conductivity and chemical stability.

The application relates to a kind of amidoxime porous organic polymer and its preparation method and application, and relates to heavy metal adsorption technical field, solve the problem that the specific adsorption selectivity of heavy metal adsorption material in prior art to heavy metal is insufficient, adsorption capacity is small, it is difficult to realize the efficient enrichment and rapid removal of heavy metal ions, and the problem that the development of specific adsorption group in prior art is in technical blank.The present application is by adding sodium nitrite aqueous solution to diphenylamine solution to carry out diazotization reaction, then adding ethyl acetate solution containing 4-hydroxyphenyl acetonitrile and triethylamine to carry out diazo coupling interfacial polymerization reaction, to obtain cyanogen-rich porous organic polymer material;The obtained material is immersed in methanol solution containing hydroxylamine hydrochloride and trimethylamine to carry out post-amidoxime modification, to obtain heavy metal adsorption material.The present application effectively improves the adsorption efficiency and specific recognition adsorption capacity of heavy metal adsorption material, and can be applied to the field of water heavy metal pollution treatment.

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.