126 results about "Atom-transfer radical-polymerization" patented technology

The invention discloses deep eutectic gel polymer electrolyte as well as preparation and application thereof, belongs to the technical field of battery electrolyte, solves the problems of low thermal stability, low ionic conductivity and poor mechanical property in the prior art, and comprises a bimetallic salt-eutectic solvent and a polymer chain which are dynamically crosslinked and constructed, the bimetallic salt-eutectic solvent comprises lithium ions, heterogeneous metal salt and Lewis base, and the polymer chain is formed by free radical polymerization, atom transfer radical polymerization (ATRP) or reversible addition-fragmentation chain transfer radical polymerization (RAFT). According to the invention, the deep eutectic solvent is introduced as a reaction solution, so that the organic gel monomer is subjected to photopolymerization or thermal polymerization in the solution, the elongation at break can reach more than 500%, the organic gel has excellent mechanical stretchability, a polymer network is formed by utilizing a long-chain molecular formula of a polymer chain, the deep eutectic solution is wrapped in the polymer network, and the organic gel has excellent thermal stability; and the good ionic conductivity of the electrolyte is ensured.

The invention discloses a cellulose coated diaphragm and a preparation method thereof in the field of lithium ion batteries, the diaphragm comprises alpha-cellulose pulp, a cellulose grafted phenylboronic acid-co-oligomeric ethylene oxide copolymer, a thermal response star zwitterionic polymer and nano aluminum oxide, and an N-methylmorpholine-N-oxide aqueous solution is adopted as a solvent system. The preparation method comprises the following steps: firstly synthesizing a cellulose grafted copolymer with dynamic borate bonds through atom transfer radical polymerization, then preparing a star polymer with thermal response arms and zwitter-ion terminals by taking cyclodextrin as a core, and finally mixing all the components to prepare coating slurry. And the composite diaphragm is prepared through the processes of coating, phase conversion, ultraviolet curing and drying. The diaphragm combines the thermal stability and lyophilic property of cellulose, forms a dynamic self-adaptive interface layer through the synergistic effect of two functional compounds, has the advantages of active safety protection, dendritic crystal inhibition, long cycle life and the like, and remarkably improves the comprehensive performance of the lithium ion battery.

The application belongs to the technical field of membrane separation materials, and discloses an ultrahydrophilic oil-water separation membrane, a preparation method and application thereof, and comprises the following steps: 2-(2-bromoisobutyryloxy)ethyl methacrylate monomers are prepared from 2-hydroxyethyl methacrylate and 2-bromoisobutyryl bromide, and a polymer with an atom transfer radical polymerization initiator is prepared through a free radical polymerization reaction; the polymer with the atom transfer radical polymerization initiator and polyacrylonitrile are dissolved into a solvent, and a PAN / P(AN-g-BIEM) blended membrane is prepared through a non-solvent induced phase separation method; and a hydrophilic polymer brush is grafted to the surface of the PAN / P(AN-g-BIEM) blended membrane to obtain the ultrahydrophilic oil-water separation membrane; the ultrahydrophilic oil-water separation membrane prepared by the application has a high separation flux, excellent oil-water separation efficiency and separation performance for different oil-in-water emulsions.

The invention relates to the technical field of catalysts, in particular to a graphene-based desulfurization catalyst and a preparation method thereof. Graphene oxide is used as a carrier, an initiating group is introduced firstly, a short-brush amphoteric polymer gradient modification layer and a long-brush amphoteric polymer gradient modification layer are sequentially constructed through atom transfer radical polymerization, ammonium molybdate-urea complex deposition is fused, and uniform nucleation of a metal precursor is achieved. Two-stage vulcanization is adopted in the preparation process, the crystallization process of a precursor is controlled step by step at different temperatures, and the size and dispersity of a molybdenum disulfide sheet layer are optimized. The catalyst is high in conversion rate under a hydrodesulfurization model system, low in total sulfur of discharged materials, and excellent in activity retention rate after multiple cycles. The method can be widely applied to the field of fuel oil deep desulfurization, and the efficient and environment-friendly industrial catalysis requirement is met.

The invention relates to the technical field of microsphere modification, in particular to a surface-functionalized microsphere and a modification method thereof.The modification method of the surface-functionalized microsphere comprises the steps that a microsphere solution obtained by mixing a microsphere with double-bond olefin on the surface and an organic solvent is mixed with molecules containing alkenyl functional groups and an azo initiator; and carrying out addition reaction to obtain the surface functionalized microspheres. Functional groups on the surfaces of the microspheres are modified by adopting an atom transfer radical polymerization method, double-bond olefin externally hung on the surfaces of the microspheres and molecules containing alkenyl functional groups are utilized, the molecules containing the alkenyl functional groups and the double-bond olefin on the surfaces of the microspheres can be subjected to an addition reaction under the action of an azo initiator, and the functional group molecules are grafted to the surfaces of the microspheres, so that the microspheres are prepared. The surfaces of the microspheres are modified into functional groups with different contents and different lengths. According to the method, the surface groups of the microspheres can be uniformly modified, and the surfaces of the microspheres can be modified into different numbers of functional groups and functional molecules with different chain lengths.

The invention relates to the technical field of papermaking and food packaging materials, in particular to a preparation method of full-degradable plastic-substituted high-strength food packaging paper. Preparing a fiber layer by taking plant fiber as a base material; the preparation method comprises the following steps: grafting a methyl methacrylate-butyl acrylate block copolymer on nano-cellulose through an atom transfer radical polymerization technology to prepare enhanced nano-cellulose; dialdehyde starch rich in aldehyde groups and chitosan are subjected to a Schiff base reaction to form a dynamic cross-linked network, polylactic acid microspheres modified by beta-cyclodextrin are introduced to serve as supramolecular enhancement units, and functional coating liquid is prepared; and finally, coating the functional coating liquid on the fiber layer, and drying, cross-linking and curing to obtain a finished product. Through cooperation of chemical grafting, dynamic covalent bonds and supramolecular action, the packaging paper is endowed with extremely high strength and toughness and excellent oil and moisture resistance and heat sealability, meanwhile, it is ensured that the packaging paper can be completely biodegraded in the natural environment, and functional replacement of traditional plastic packaging is successfully achieved.

The invention belongs to the technical field of lithium battery negative electrode interface modification, and discloses a multifunctional two-dimensional hybrid polymer artificial SEI membrane and a preparation method and application thereof. Comprising a compound as shown in a formula I, a polymer brush is grafted on the surface of brominated graphene oxide through atom transfer radical polymerization (ATRP), monomers of the polymer brush are carboxyl-containing monomers and fluorine-containing monomers, and the artificial SEI membrane is constructed through spin coating and membrane forming. The multifunctional artificial SEI film provided by the invention has the structural and functional characteristics of two-dimensional graphene oxide and in-situ reaction type macromolecules, the mechanical property of the film can be remarkably improved by an accumulated two-dimensional skeleton, the Young modulus can reach 3.7 GPa, the growth of lithium dendrites is inhibited, and the performance of the film is improved. Functional groups (carboxyl and fluoro) in the hybrid polymer brush and lithium metal are subjected to in-situ chemical reaction, so that the electrode interface stability and the lithium deposition uniformity are improved, and the hybrid polymer brush has wide application prospects in the field of lithium batteries.

The invention discloses a full-biodegradable bag and a preparation method thereof in the technical field of biodegradable materials.According to the full-biodegradable bag, polylactic acid and poly (butylene adipate-co-terephthalate) serve as matrixes, and performance optimization is achieved by adding a specially-made nanofiber interpenetrating network compatibilizer and a star-shaped structure bio-based plasticizer; wherein the nanofiber interpenetrating network compatibilizer is prepared by grafting polylactic acid and poly (butylene adipate-co-terephthalate) chain segments on cellulose nanofibers through an atom transfer radical polymerization technology, and the star-shaped structure bio-based plasticizer is prepared through ring opening polymerization and melt grafting technologies. In addition, the formula also comprises a maleimide modified lignin filler, an ethylene bis stearamide lubricant and an antioxidant. Through the synergistic effect of the two specially-made modified compounds, the compatibility of all the components is remarkably improved, the preparation process is simple and reliable and suitable for industrial production, and the problem of white pollution of traditional plastic products can be effectively solved.

The application discloses a crystalline hyperbranched multi-arm copolymer, a self-supporting graphene film and a preparation and application thereof. The crystalline hyperbranched multi-arm copolymer is prepared by the following method: a hyperbranched macromolecular initiator is obtained by using an alpha-diimine palladium catalyst to catalyze ethylene and a bromine-containing functional monomer in a one-step "chain removal" copolymerization in a water-free grade solvent; and then the hyperbranched macromolecular initiator is used to initiate atom transfer radical polymerization of an acrylate functional monomer to obtain the crystalline hyperbranched multi-arm copolymer. The crystalline hyperbranched multi-arm copolymer, graphite powder and a solvent are mixed in proportion, graphene initial dispersion liquid is obtained through ultrasonic and centrifugal separation, and then the self-supporting graphene film is obtained through filtration, elution and drying in sequence. The application provides an application of the self-supporting graphene film as an electrothermal film, and the self-supporting graphene film has excellent electrothermal performance and mechanical strength.

The invention relates to a PVP-b-PMMA (Polyvinyl Pyrrolidone-b-Polymethyl Methacrylate) block polymer, a preparation method thereof and an ultrafiltration membrane. The PVP-b-PMMA block polymer is prepared from the following raw materials: N-vinyl pyrrolidone and methyl methacrylate according to a mass ratio of 1 to (0.3 to 4); the preparation method of the PVP-b-PMMA block polymer comprises the following step: carrying out atom transfer radical polymerization on N-vinyl pyrrolidone and methyl methacrylate to obtain the PVP-b-PMMA block polymer. According to the preparation method disclosed by the invention, the PVP-b-PMMA block polymer with excellent performance is prepared by designing the mass ratio of the raw materials of N-vinyl pyrrolidone (NVP) and methyl methacrylate (MMA) for preparing the PVP-b-PMMA block polymer. The filtering membrane prepared from the PVP-b-PMMA block polymer can realize the synergistic improvement of high flux, retention rate, pollution resistance and stability.

The application discloses a preparation method and application method of a high-performance optical fiber coating modified by polymer grafted carbon nanotubes, and the preparation method comprises the following steps: pre-treating carbon nanotubes to obtain brominated carbon nanotubes; performing grafting treatment on the brominated carbon nanotubes through photocatalytic atom transfer radical polymerization to obtain polymer grafted functionalized carbon nanotubes; and mixing the polymer grafted functionalized carbon nanotubes with a prepolymer, an active diluent and a photoinitiator to obtain the required high-performance optical fiber coating. The carbon nanotubes are grafted with polyacrylate polymer chains on the surface, which can improve the dispersibility of the carbon nanotubes in the coating system, ensure the long-term stability and functional effectiveness of the carbon nanotubes in the coating, overcome the problems of poor compatibility and uneven dispersion of existing carbon-based composite coatings, improve the mechanical properties and thermal stability of the optical fiber coating, enhance the bonding strength between the coating and the optical fiber, and provide a new perspective for the preparation of high-performance optical fiber coatings.

The application discloses a preparation method of a yacht special high-adhesion anti-fouling paint, which comprises the following steps: preparing an anti-fouling paint resin by atom transfer radical polymerization of a catechol monomer containing an unsaturated double bond, an acrylic ester monomer containing an epoxy group, a silane acrylate monomer and an acrylic monomer, and mixing the resin with an amino-modified pigment, an anti-fouling agent and the like to obtain the anti-fouling paint. Compared with traditional anti-fouling paint, the catechol structure contained in the application can form a strong interaction with various substrates, greatly increasing the adhesion of the paint and avoiding the paint from falling off when the yacht is sailing at a high speed. The amino-modified pigment can be uniformly dispersed in the paint by reacting with the epoxy group of the resin matrix, avoiding the color deviation caused by pigment deposition or falling off, and enabling the yacht to keep a bright paint color for a long time. The amino group reacts with the epoxy group to form a cross-linking structure, increasing the hardness of the coating and resisting the impact of water flow and silt during the sailing of the yacht.

A graphite-phase carbon nitride composite material covalently modified with a polymethyl methacrylate polymer containing a porphyrin group at its end, and a preparation method thereof, belong to the technical field of nonlinear optical materials. The composite material is characterized by being formed by covalently modifying graphite-phase carbon nitride with polymethyl methacrylate containing a porphyrin group at its end. The preparation method comprises first preparing polymethyl methacrylate containing a porphyrin group at its end by atom transfer radical polymerization, and then covalently linking the polymethyl methacrylate with a graphite-phase carbon nitride covalently modified with benzyl alcohol to prepare a graphite-phase carbon nitride composite material covalently modified with polymethyl methacrylate containing a porphyrin group at its end. The composite material is a nonlinear optical material. This method can produce a composite material with excellent nonlinear optical properties, and the nonlinear optical properties of the composite material can be controlled by varying the polymer of the porphyrin polymer.

The present application relates to the preparation field of organic polymer monolithic column, in particular to a kind of double-continuous supermacroporous cellulose / polystyrene composite monolithic column and its preparation method and application.Firstly, O / W Pickering emulsion is prepared using modified cellulose nanocrystal (CNC), and Janus CNC-PS with single side grafted polystyrene (PS) polymer brush is prepared by electron activation regeneration-atom transfer radical polymerization (AGET-ATRP) reaction system, and double-continuous phase emulsion gel (Bijel) is prepared by one-step stirring method using Janus CNC-PS with different HLB values as stabilizer.Then, double-continuous supermacroporous cellulose / polystyrene composite monolithic column is obtained by in-situ active polymerization through AGET-ATRP reaction using Janus CNC-PS as macromolecular initiator and Bijel as emulsion template.The obtained monolithic column has uniform skeleton structure, double-continuous skeleton and pore, high mechanical strength, and the unmodified side of CNC covers the outer surface of skeleton, so that the pore surface has hydrophilicity and is easy to modify.The monolithic column effectively overcomes the defects of current polymer monolithic column, such as poor biocompatibility, low mechanical strength and low specific surface area, and has great application potential in the field of enzyme and cell immobilization and biomacromolecule separation and analysis.

The invention discloses a waterproof antibacterial moisture-conducting home textile fabric and a preparation method thereof, and belongs to the field of textile fabric processing, the waterproof antibacterial moisture-conducting home textile fabric sequentially comprises a waterproof antibacterial outer layer, a sweat-absorbing middle layer and an antibacterial inner layer from top to bottom, and the waterproof antibacterial outer layer, the sweat-absorbing middle layer and the antibacterial inner layer are connected together in a laminated mode; the waterproof and antibacterial outer layer is used for preparing waterproof and antibacterial silicon dioxide nano particles through a method of initiating atom transfer radical polymerization on the surface, then the waterproof and antibacterial silicon dioxide nano particles are polymerized on the surface of the cotton fabric, the sweat-absorbing middle layer is composed of regenerated cellulose fibers with sweat-absorbing columns, and the antibacterial inner layer is formed by weaving bamboo fibers and milk protein fibers. The home textile fabric has excellent waterproof, antibacterial and moisture-conducting properties, and the washing resistance and the strength of the home textile fabric are basically not affected.

The provided is a PMMA (polymethylmethacrylate) and borax doped copolymer synthesized by using atom transfer radical polymerization (ATRP) method, and uses of this copolymer. The steps of the method include: filling an Atmos-Bag with argon gas; and weighing of Tetra-n-butylammonium Bromide, Copper Bromide, Borax Decahydrate, Methyl Methacrylate, Pentamethyldiethylenetriamine, Ethyl 2-bromoisobutyrate chemicals with a precision scale in the Atmos-Bag.

The present invention provides a thermoresponsive amphiphilic triblock polymer, a preparation method, an application thereof, and a drug-loaded micelle. A thermoresponsive amphiphilic triblock polymer P(PFPHM9-b-DMAA-b-PEGMA is prepared by using activators regenerated by electron transfer for atom transfer radical polymerization (ARGET ATRP). 360 ) The thermoresponsive amphiphilic triblock polymer P(PFPHM9-b-DMAA-b-PEGMA 360 ) has temperature sensitivity and a low critical micelle concentration, and has no biological toxicity, and can be used as a drug carrier for doxorubicin. The P(PFPHM9-b-DMAA-b-PEGMA 360 ) of the present invention can effectively encapsulate DOX, thereby obtaining a thermoresponsive amphiphilic triblock polymer drug-loaded micelle. The drug-loaded micelle has a slow drug release at 37°C, which is beneficial to the circulation of the drug in the body, reduces the dosage of the drug and the side effects of the drug on the human body, while the drug is rapidly released at 42°C, which is beneficial to acting on the patient position in a short time and reducing the treatment time.

The invention discloses a hyperbranched structure grafting-based shrinkage reducing agent for UHPC (Ultra High Performance Concrete), a preparation method of the shrinkage reducing agent and a preparation method of a polycarboxylate superplasticizer. Two types of shrinkage reducing monomers are compounded and then polymerized with modified cyclodextrin through an ATRP (Atom Transfer Radical Polymerization) method to generate the shrinkage reducing agent which is adaptive to UHPC (Ultra High Performance Polycarbonate) and has the functions of regulating and controlling surface tension and keeping internal humidity. The preparation process is simple, convenient and easy to control, the cost is low, the product property is stable, on the premise of ensuring the mechanical property of the concrete, the shrinkage rate of the concrete can be stably reduced for a long time, the cracking resistance of the concrete is improved, the durability of the concrete is improved, and the application requirements of UHPC under more complex working conditions are promoted.

The application belongs to the technical field of separation resin, and relates to a zwitterionic ion exchange resin and a preparation method and application thereof. The zwitterionic ion exchange resin is obtained by introducing chloromethylated polystyrene resin into monomer 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonate and monomer methacryloyloxyethyl trimethyl ammonium chloride through an atom transfer radical polymerization reaction. The exposed quaternary ammonium salt groups on the 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonate and the methacryloyloxyethyl trimethyl ammonium chloride in the zwitterionic ion exchange resin can improve the separation rate of acid and sugar; meanwhile, the sulfonate groups on the 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonate in the resin can effectively weaken the sulfuric acid tailing phenomenon.

The invention discloses a preparation method of cationic polyacrylamide for an oil field in the field of oilfield chemical agents, which comprises the following steps: firstly, preparing a carbon dioxide response type star polymer modified material which is synthesized by taking ethylenediamine as a core through four-step reaction: firstly, reacting with a brominating reagent to form a four-arm initiator; carrying out atom transfer radical polymerization on the star-shaped polymer, dimethylaminoethyl acrylate and hexafluorobutyl acrylate to construct a star-shaped skeleton; then carrying out inclusion modification with hydroxypropyl beta cyclodextrin through host-guest interaction; and finally, performing double crosslinking through zinc ion coordination and etherification reaction to obtain the modified material. The modified material, acrylamide, a cationic monomer and an auxiliary monomer are dissolved in water, a two-stage polymerization process of low-temperature pre-polymerization and high-temperature post-polymerization is performed, and granulation, drying and crushing are performed to obtain a final product. The polyacrylamide prepared by the method shows excellent tackifying performance and temperature-resistant and salt-resistant performance in oil field application, and is especially suitable for tertiary oil recovery operation under high-temperature and high-salt oil reservoir conditions.

The invention relates to the technical field of papermaking, in particular to a preparation method of ultrathin high-strength paper-based adhesive tape base paper. The preparation method comprises the following steps: mixing softwood pulp and hardwood pulp, forming base paper by adopting a double-net dehydration process, and forming a covalent cross-linked network in a paper sheet by adopting a cellulose reactive coupling agent with an o-benzoquinone structure and a multi-sulfydryl compound based on a sulfydryl-benzoquinone click chemistry and interface supramolecular assembly multi-bonding enhancement system; meanwhile, a dual intelligent enhancement system based on a biomacromolecule self-assembly body and a dynamic metal coordination network is established, and dynamic reversible crosslinking is constructed through a polyelectrolyte compound and a Fe < 3 + >-tannic acid coordination network; a multifunctional surface treatment technology combining a zwitterionic polymer brush and bionic in-situ mineralization is developed, a sulphobetaine methacrylate polymer brush grows through a surface-initiated atom transfer radical polymerization method, amorphous silicon dioxide is induced to be mineralized, and the adhesive tape body paper prepared through the method is high in strength.

The present invention discloses a hyperbranched multi-arm reversible cross-linked resin, its preparation, and application as an adhesive. The preparation method of the hyperbranched multi-arm reversible cross-linked resin comprises: step 1, using an α-diimine palladium catalyst to catalyze the copolymerization of ethylene and a reversible cross-linking functional monomer A shown in formula I based on a "chain walking" mechanism to obtain a hyperbranched polyethylene reversible cross-linking agent; step 2, using 2-bromoisobutyryl bromide as an initiator, and using ordinary monomers and a reversible cross-linking functional monomer B shown in formula IV as comonomers, and synthesizing a linear reversible cross-linked polymer by atom transfer radical polymerization; step 3, cross-linking the hyperbranched polyethylene reversible cross-linking agent and the linear reversible cross-linked polymer in a solvent to obtain a hyperbranched multi-arm reversible cross-linked resin. The present invention provides the application of the hyperbranched multi-arm reversible cross-linked resin as an adhesive, which has excellent bonding properties and recyclability and is suitable for large-scale application. #imgabs0##imgabs1#

The application belongs to the field of gas separation membrane preparation, and discloses a polyimide hollow fiber membrane with a polyionic liquid side chain structure and a preparation method and application thereof. The polyimide hollow fiber membrane with the polyionic liquid side chain structure comprises an aromatic polyimide main chain containing alkyl and a vinyl polyionic liquid side chain. The polyionic liquid fragment is fixed on the aromatic polyimide main chain by using an atom transfer radical polymerization reaction, and the active H on the imidazole ring in the polyionic liquid has a strong interaction with CO2 and other polar gases, so that high selective and rapid transportation of CO2 can be realized, and the permeation performance of the membrane to CO2 and other polar gases is improved. The obtained hollow fiber membrane has good heat resistance and mechanical properties, can treat flue gas at a high temperature and a high pressure, and improves production efficiency.

The invention discloses a preparation and application method of a dual-responsiveness perfume microcapsule for cigarettes, which adopts a simple, low-cost and high-efficiency electron transfer catalytic regeneration atom transfer radical polymerization (ARGET ATPR) method, takes natural plant essential oil as a core material, takes modified chitosan derivatives and polymethylacrylic acid N, N-dimethylaminoethyl ester (PDMAEMA) as wall materials, and adopts a one-step method to prepare the dual-responsiveness perfume microcapsule for the cigarettes. The prepared plant essential oil loaded perfume microcapsule is uniform in shape and size, compact in structure, high in mechanical strength, large in perfume loading amount, high in encapsulation efficiency, high in stability in a normal-temperature environment and long in perfume retention time, and can quickly respond and release weak acid gas generated by cigarette combustion and in a high-temperature environment; the spice microcapsule is added into cigarette tobacco shreds in a spraying or direct mixing mode, the sensory quality of cigarettes can be remarkably improved during combustion, offensive odor is reduced, irritation is reduced, aftertaste is improved, the cigarettes are endowed with unique plant source characteristic aroma, and smoking experience is richer and more diversified.

The invention relates to a quartz harmonic oscillator surface metallization method based on an atom transfer radical polymerization method. The method comprises the following steps: firstly, carrying out surface cleaning and hydroxylation on a quartz substrate; then immersing the quartz substrate into a toluene solution of (3-aminopropyl) triethoxysilane, continuously reacting, immersing the quartz substrate into anhydrous tetrahydrofuran or dichloromethane, and adding an acid absorbent for reacting; mixing the quartz substrate with a monomer with a metal coordination functional group, a catalyst, a ligand and a solvent, and carrying out polymerization reaction; after polymerization, immersing the quartz substrate into a metal salt solution for metal ion adsorption; and taking out, cleaning, reducing and annealing to obtain a pure quartz surface metal layer. According to the method, the absolutely uniform polymer template can be formed on a workpiece with a complex three-dimensional curved surface macroscopically through microcosmic quartz surface modification of the polymer and a dipping-metal reduction method, then uniform atomic layer scale metal deposition is achieved, and extremely high uniformity and shape preserving performance are achieved.

The invention discloses an aggregation-induced emission photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of preparation of compounds. The structural formula of the aggregation-induced emission photocatalyst is as shown in formula I, wherein R1 is F or Cl; r2 is a diphenylamino group, a substituted diphenylamino group, a triphenylamino group or a substituted triphenylamino group; and R3 is Br, a substituted diphenylamino group, a triphenylamino group or a substituted triphenylamino group. The photocatalyst has visible light absorption, aggregation enhanced luminescence and reduction activity. According to the preparation method, a 4, 7-dibromobenzothiadiazole derivative and aromatic amine are subjected to Buchwald or Suzuki reaction, and the condition is mild. The catalyst is used for metal-free light-operated atom transfer radical polymerization, can efficiently catalyze the polymerization of acrylate monomers under the irradiation of a blue light or green light LED with a low dosage of 5-100 ppm, realizes high conversion rate, narrow distribution and block synthesis, is suitable for an aqueous phase system, and has good biocompatibility and large-scale prospects.

The invention provides a preparation method of a negatively charged polytetrafluoroethylene membrane, the negatively charged polytetrafluoroethylene membrane and application of the negatively charged polytetrafluoroethylene membrane, and relates to the technical field of membrane materials. The preparation method of the negatively charged polytetrafluoroethylene membrane comprises the following steps: putting a polytetrafluoroethylene membrane into an alcohol solution containing a siloxane coupling agent, and carrying out first soaking treatment; placing the treated polytetrafluoroethylene film in an acidic aqueous solution, and carrying out secondary soaking treatment to complete hydrolysis primary dehydration condensation; carrying out drying treatment on the treated polytetrafluoroethylene film to finish deep dehydration condensation; the preparation method comprises the following steps: bonding an atom transfer radical polymerization initiation site on the surface of a polytetrafluoroethylene membrane, activating a regenerated catalyst through electron transfer, carrying out atom transfer radical polymerization reaction, and grafting a negatively charged hydrophilic monomer on the surface of the polytetrafluoroethylene membrane with the initiation site to obtain the negatively charged polytetrafluoroethylene membrane. The negatively charged polytetrafluoroethylene membrane disclosed by the invention has excellent hydrophilicity and charge long-term effect.

The present invention relates to the field of anti-icing coatings, and in particular to a highly hydrophobic composite anti-icing coating, comprising the following raw materials in parts by weight: 65-75 parts of a block polymer, 5-8 parts of a photothermal filler, 4-6 parts of hydrophobic nano-silica, 8-10 parts of an isocyanate curing agent, 0.5-1.2 parts of a defoaming agent, 0.8-1.4 parts of a leveling agent, and 15-18 parts of ethyl acetate. The block polymer having a fluorosilicon segment is prepared by an atom transfer radical polymerization method, and the block polymer is used as a matrix resin, and a photothermal filler wrapped in polydopamine is added. This solves the problems of poor weather resistance of the anti-icing coating and poor compatibility of the photothermal filler with the matrix resin, and the anti-icing coating has a good photothermal effect, thereby achieving a good anti-icing effect.

The invention provides a preparation method of polyacrylonitrile carbon fibers, and belongs to the technical field of carbon fiber manufacturing. The preparation method of the polyacrylonitrile carbon fiber comprises the following steps: S1, providing a polyol compound, and then reacting a halogenating reagent with the polyol compound to enable at least part of hydroxyl in the polyol compound to be halogenated so as to obtain an initiator; s2, performing atom transfer radical polymerization reaction on an initiator, an acrylonitrile monomer and a catalyst in a solvent to obtain a polyacrylonitrile spinning solution; s3, carrying out spinning treatment on the polyacrylonitrile spinning solution to obtain a polyacrylonitrile precursor; s4, carrying out pre-oxidation treatment on the polyacrylonitrile precursor to obtain a polyacrylonitrile pre-oxidized fiber; s5, carbonizing the polyacrylonitrile pre-oxidized fibers to obtain polyacrylonitrile carbon fibers, and by means of the preparation method, the high-quality polyacrylonitrile pre-oxidized fibers which are high in pre-oxidation degree and few in skin-core layering defect can be prepared in the pre-oxidation stage.

The invention relates to the field of oilfield chemistry, and discloses a zwitterionic polymerization grafted graphene oxide blocking agent and a water-based drilling fluid, a preparation method of zwitterionic polymerization grafted graphene oxide comprises the following steps: after ultrasonic dispersion of graphene oxide, reacting with a silane coupling agent-absolute ethyl alcohol mixed solution to prepare aminated graphene oxide; dispersing the brominated graphene oxide in methylbenzene and reacting with a surface initiator to obtain brominated graphene oxide; and under the protection of nitrogen, in a deionized water / dimethyl sulfoxide mixed solvent, atom transfer radical polymerization is carried out by using a ligand, a zwitterionic monomer and a catalyst, and finally, zwitterionic polymerization grafted graphene oxide is obtained through dialysis. The composite material has excellent plugging performance under the conditions of high temperature and high salinity, can effectively solve the problem of plugging failure of high-performance plugging anti-sloughing water-based drilling fluid, and provides a novel drilling fluid system support for drilling and development of resources such as shale gas and natural gas.