661 results about "Ring-opening polymerization" patented technology

The invention relates to a high-voltage-resistant deep eutectic-based in-situ polymerization solid electrolyte as well as preparation and application thereof. The in-situ polymerization solid electrolyte is obtained through an in-situ polymerization reaction of a precursor solution comprising 30-80 wt% of a deep eutectic solution, 10-50 wt% of a polymerizable monomer, 1-30 wt% of an additive and 0.05-10 wt% of an initiator; the deep eutectic solution comprises a lithium salt and a hydrogen bond donor organic solvent; the hydrogen bond donor organic solvent comprises a nitrile solvent and a non-nitrile solvent; the polymerizable monomer comprises a monomer for free radical-initiated polymerization or ring-opening polymerization; the additive comprises lithium nitrate and fluoroethylene carbonate. The high-voltage-resistant in-situ polymerization solid electrolyte formed by in-situ compounding of an organic framework formed by in-situ polymerization of a deep eutectic solution, an additive and a monomer has the excellent characteristics of wide electrochemical window, high ionic conductivity, high mechanical strength, good flame retardance, wide-temperature applicability and the like, and can be suitable for a high-voltage system of 4.6 V or above; the solid-solid contact problem of a solid-state battery interface is effectively solved, and the side reaction between the electrolyte and the lithium metal negative electrode is reduced.

The invention discloses a high-cold-resistance environment-friendly PVC decorative material and application thereof, belongs to the technical field of PVC preparation, and is used for solving the technical problem that the low temperature resistance and the environmental protection property of a PVC material in the prior art need to be further improved. The high-cold-resistance environment-friendly PVC decorative material specifically comprises the following raw materials in parts by weight: 80-100 parts of composite PVC, 8-10 parts of a bio-based plasticizer and 6-10 parts of an auxiliary additive; the preparation method comprises the following steps: modifying montmorillonite by using a silane coupling agent, loading magnesium hydroxide to prepare a composite filler, carrying out ring-opening polymerization, amine end capping and oxidation on cyclotrisiloxane to generate a low-temperature-resistant agent containing an epoxy group, introducing trimethoxysilane into PVC through sulfydryl substitution, carrying out hydrolytic condensation to form a Si-O-Si cross-linked network, and covalently binding the Si-O-Si cross-linked network with the filler and the low-temperature-resistant agent to obtain the low-temperature-resistant PVC composite material. And reacting the epoxidized soybean oil with glycine, and carrying out calcium coordination to generate a bio-based plasticizer, thereby finally preparing the PVC decorative material.

The invention discloses a macromolecular antibacterial agent, an antibacterial nylon material as well as a preparation method and application thereof, and relates to the technical field of antibacterial macromolecular materials. According to the invention, lysine is used as a raw material, the polymer antibacterial agent is prepared through reactions such as dehydration ring formation and re-ring opening polymerization, the polymer antibacterial agent has the characteristics of high safety, biodegradability and good biocompatibility, and has the same polyamide main chain structure as nylon, the polymer antibacterial agent and nylon have good compatibility, and the polymer antibacterial agent and nylon 6 are fused and blended to form a nylon 6 sample. Through amide exchange reaction and hydrogen bond interaction between the macromolecular antibacterial agent and nylon 6 molecular chains, the antibacterial nylon material with excellent mechanical property and lasting and stable antibacterial effect is prepared, and the requirements of people for safety and environmental friendliness are met. The prepared antibacterial nylon material can be applied to antibacterial products such as textiles, daily necessities and packaging materials. Meanwhile, the macromolecular antibacterial agent and the antibacterial nylon material are simple in preparation process, low in raw material cost and suitable for industrial production.

The invention relates to the technical field of polyurethane synthesis, and discloses a polyurethane prepolymer and composition based on supramolecular weaving crosslinking and a preparation method of the polyurethane prepolymer, and a cross-linking agent in the polyurethane prepolymer comprises a compound as shown in a formula I and organic copper salt; the molar ratio of the compound as shown in the formula I to the organic copper salt is 1: (1.8-3); the organic copper salt is selected from copper tetraacetonitrile tetrafluoroborate and / or copper tetraacetonitrile hexafluorophosphate. According to the invention, the dynamic nature of a mechanical interlocking supramolecular structure is utilized, and a polymer with a topological structure is woven through an ectopic ring-opening polymerization strategy. The woven polymer can be used as a cross-linking agent of a polyurethane composition, can endow the polyurethane composition with relatively high mechanical property and good tensile property at the same time, and greatly improves the tensile toughness of polyurethane. # imgabs0 #

The invention belongs to the technical field of polyurethane, and particularly relates to a low-swelling-rate hydrophilic polyurethane sponge composite material as well as a preparation method and application thereof. The low-swelling-rate hydrophilic polyurethane sponge composite material is prepared from a component A and a component B according to the mass ratio of 100: (50-55), and the component A comprises the following raw materials: a foaming agent, wollastonite powder, an antibacterial agent, emulsifying wax and a polyether type cross-linking agent; the component B comprises polyether ester polyol and toluene diisocynate; the polyether type cross-linking agent is prepared by taking triethanolamine as an initiator and carrying out ring-opening polymerization reaction with EO; the polyether ester polyol is prepared by taking polyethylene glycol, diethylene glycol, trimethylolpropane and adipic acid as raw materials through esterification reaction. The hydrophilic polyurethane sponge prepared from the composite material is good in hydrophilicity, high in aperture ratio, fine and smooth in foam hole, low in swelling ratio and excellent in mechanical property.

The invention discloses a self-adaptive light-dimming temperature-control polyurethane protective film and a preparation method thereof, and relates to the technical field of high polymer materials. When the self-adaptive light-dimming temperature-control polyurethane protective film is prepared, castor oil reacts with sulfhydrylated thiosemicarbazone to prepare modified castor oil; the preparation method comprises the following steps: carrying out ring opening polymerization on flame-retardant cyclotetrasiloxane and tetramethyl cyclotetrasiloxane to prepare a siloxane oligomer; enabling vanadium pentoxide, oxalic acid and tungstic acid to react to prepare tungsten-doped vanadium dioxide; the preparation method comprises the following steps: carrying out a reaction on tungsten-doped vanadium dioxide and allyltriethoxysilane to prepare modified vanadium dioxide; uniformly mixing castor oil, modified castor oil, siloxane oligomer, isophorone diisocyanate and copper chloride, pouring the mixture into a mold, and performing curing molding, so as to obtain the self-adaptive light-dimming temperature-control polyurethane protective film. The self-adaptive light-dimming temperature-control polyurethane protective film prepared by the invention has excellent flame retardance, tensile strength and self-adaptive light-dimming temperature-control performance.

The invention belongs to the technical field of polyfluorosiloxane synthesis, and provides a low-by-product polyfluorosiloxane controllable synthesis method which comprises the following steps: carrying out anionic ring opening polymerization on D3F by adopting a binary organic catalytic system, weakening the strong nucleophilicity of an active center based on hydrogen-bond interaction and steric effect, and inhibiting the occurrence of chain back-biting side reaction, so as to obtain the low-by-product polyfluorosiloxane. The polyfluorosiloxane with low content of by-product DnF (n is greater than or equal to 4), controllable structure and narrow molecular weight distribution is prepared. The polyfluorosiloxane with low byproduct content is catalyzed by the binary organic catalyst, the synthesis method is simple, the operation is convenient, the reaction condition is mild, the catalyst has good stability, large-scale production is easy, and further development of the polyfluorosiloxane in the field of high-end and harsh oil-resistant sealing materials can be promoted.

The invention relates to the technical field of lithium battery electrolytes, in particular to a preparation method of a polyether-based solid electrolyte and application of the polyether-based solid electrolyte in electrochemical devices such as lithium metal batteries. The polyether-based solid electrolyte material comprises a porous polymer skeleton, a cyclic ether monomer, a copper-based compound, a lithium salt and a plasticizing additive. The preparation method comprises the following steps: loading a copper-based compound into a porous polymer skeleton, adding cyclic ether, lithium salt and the like to carry out in-situ ring opening polymerization, cooperatively constructing a polyether-porous polymer skeleton three-dimensional network structure, and improving the mechanical strength of the electrolyte. Wherein the copper-based compound widens the chain spacing of the porous polymer, and is convenient for the cyclic ether monomer to penetrate into the skeleton; meanwhile, the in-situ ring-opening polymerization of the cyclic ether promotes the close contact between the electrolyte and an electrode, the interface impedance is reduced, and the ionic conductivity is improved. The polyether-based solid electrolyte prepared by the invention can promote stable circulation of a lithium metal battery.

The invention discloses a halogen-free flame-retardant benzoxazine-epoxy / aramid fiber composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material is obtained by heating and curing main chain type phosphorus-containing benzoxazine, epoxy resin and aramid fiber according to the mass fraction ratio of (1%-50%): (40%-70%): (30%-70%); the main chain type phosphorus-containing benzoxazine is prepared by carrying out Mannich condensation reaction on phosphorus-containing diamine, bisphenol and paraformaldehyde according to the molar ratio of 1: 1: (4.1-4.4). According to the prepared composite material, main chain type phosphorus-containing benzoxazine modified epoxy resin serves as a matrix, the matrix and aramid fibers are subjected to heating curing to prepare the composite material, benzoxazine is crosslinked with the aramid fibers and the epoxy resin when subjected to ring opening polymerization, the interface bonding performance between the aramid fibers and the epoxy resin can be remarkably improved, and the composite material can be used for preparing the aramid fibers and the epoxy resin. The mechanical property of the composite material can be effectively improved; meanwhile, benzoxazine contains phosphorus, so that the flame retardant property of the composite material can be improved, and the application field of the aramid fiber composite material is expanded.

According to the lithium battery and the preparation method thereof provided by the invention, dual mechanisms of free radical polymerization and ring-opening polymerization are combined, a stable double-crosslinking structure gel electrolyte constructed by two polymers can be obtained in an in-situ polymerization process, and the mechanical strength and the thermal stability are improved; by regulating and controlling the ratio of an epoxy monomer to an acrylate monomer, firstly, room-temperature ring-opening polymerization is performed, so that part of in-situ gel is formed before formation, smooth formation of a gel interface is ensured, the first coulombic efficiency of the battery is not influenced, and meanwhile, the dosage of the acrylate monomer and a corresponding thermal initiator is reduced; high-temperature treatment is carried out after formation, so that the interface aging of the battery is stable, the cycle life of the battery is prolonged, the acrylate monomers are polymerized, the high temperature continues to promote the polymerization of the residual epoxy monomers, the polymerization conversion rate is favorably increased, and the high-pressure resistance and oxidative decomposition resistance of the gel electrolyte are improved.

The invention discloses incombustible water-based aerosol spray paint and a preparation method thereof, and relates to the technical field of spray paint. When the non-combustible water-based aerosol spray paint is prepared, firstly, p-(triethoxysilyl) acetophenone reacts with trimethylchlorosilane, and then the reaction product and tetramethyl tetravinyl cyclotetrasiloxane are subjected to ring opening polymerization to obtain modified polysiloxane; grafting epoxy resin with 4-vinyl-methyl benzoate, reacting with modified polysiloxane to obtain modified epoxy resin, and emulsifying to obtain a modified epoxy resin emulsion; secondly, reacting the silicon dioxide subjected to acylating chlorination with 4-hydroxy-2, 2, 6, 6-tetramethylpiperidine nitroxide free radicals, reacting with 3-(3-thienyl) propionaldehyde, and reacting with thiophene and 3-vinyl thiophene to obtain modified silicon dioxide; and finally, mixing the modified epoxy resin emulsion, pure water, the modified silicon dioxide, a curing agent and a photoinitiator to prepare the incombustible water-based aerosol spray paint.

The invention belongs to the technical field of composite pipes, and relates to a polytetrafluoroethylene and soluble polytetrafluoroethylene composite pipe as well as a processing method and application thereof. The preparation method comprises the following steps: firstly, carrying out ring opening polymerization on D3F and blocking by using an amino-containing silane coupling agent to prepare amino-terminated fluorosilicone oil, and taking the amino-terminated fluorosilicone oil as a lubricating agent for compounding and processing PTFE and PFA. The amino-terminated fluorosilicone oil contains a CF3 chain segment which has excellent compatibility with PTFE or PFA, and meanwhile, the cross-linking agent is added to form a chemical bond and a cross-linked structure with amino at the tail end of the lubricant, so that the wear resistance, tensile strength, permeability resistance and high-temperature creep resistance of the PTFE and PFA composite pipe can be improved, and the PTFE and PFA composite pipe can adapt to a long-term high-temperature working environment.

The invention provides biomass daidzein-based high-performance light-cured solder resist ink and a preparation method thereof, and the preparation method comprises the following steps: carrying out ring-opening polymerization reaction modification on daidzein diglycidyl ether and acrylic acid, and finally carrying out esterification reaction with unsaturated anhydride to obtain biomass daidzein-based alkali-soluble light-cured resin. According to the technical scheme, daidzein derivative daidzein with liquid crystal characteristics is adopted as a main body structure, then daidzein diglycidyl ether is synthesized through epichlorohydrin, and then the alkali-soluble light-cured resin is synthesized and prepared through grafting acrylic acid and unsaturated anhydride. And a cured film formed by curing the high-performance light-cured solder resist ink formed by compounding the high-performance light-cured solder resist ink with daidzein diglycidyl ether has the advantages and characteristics of high heat resistance and high toughness.

The invention provides a ring-opening polymerization method of N-carboxyl intracyclic anhydride, which comprises the following step: by taking N-carboxyl intracyclic anhydride as a monomer and taking dendritic macromolecular polyamide-amine (PAMAM) as an initiator, carrying out ring-opening polymerization reaction to obtain an amino acid polymer. According to the technical scheme provided by the invention, beta-folding of N-carboxyl intracyclic anhydride monomers (including N-carboxyl intracyclic anhydride with beta-folding tendency) during ring opening polymerization can be effectively avoided, and a product with alpha-helical configuration is obtained. Therefore, the reaction rate of ring-opening polymerization of the N-carboxyl anhydride is obviously accelerated; the molecular weight of the formed polymer is controllable, and the molecular weight distribution is more uniform; the strategy of irreversible chemical modification on the N-carboxyl intracyclic anhydride monomer is avoided, and the chemical nature of the N-carboxyl intracyclic anhydride residue is retained to the greatest extent; the whole reaction process is simple, monomer raw materials are easy to obtain, and the method is very suitable for large-scale popularization and application.

The invention discloses a preparation method of an epoxy resin-based high-electrical-strength composite insulating material. The preparation method comprises the following steps: carrying out ring opening polymerization on 100 parts by weight of epoxy resin matrix and 0.5-10 parts by weight of fluorine-containing epoxy monomer under the action of 0.1-1 part by weight of catalyst to generate fluorine-containing modified epoxy resin; then carrying out a curing reaction with 30-50 parts by weight of a fluorine-containing aromatic amine curing agent to form a high-crosslinking-density network structure; then blending with 2-4 parts by weight of nano filler; and finally, carrying out vacuum degassing, injecting into a mold, and carrying out pre-curing and post-curing to obtain the material. According to the method, the fluorine-containing monomer and the curing agent are introduced, and the nano filler is combined, so that the electrical strength, the aging resistance and the long-term stability of the composite insulating material are remarkably improved, and the composite insulating material has a wide application prospect in the fields of power transmission, electronic packaging, aerospace and the like.

The invention discloses a continuous aramid fiber reinforced epoxy resin composite material and a preparation method thereof, and belongs to the technical field of composite materials. The composite material is obtained by heating and curing continuous aramid fibers modified by a benzoxazine-containing waterborne polyurethane emulsion sizing agent and epoxy resin, the waterborne polyurethane emulsion sizing agent containing benzoxazine is prepared from diisocyanate, long-chain diol, 2, 2-dimethylolpropionic acid, dihydric alcohol containing benzoxazine and triethylamine according to the molar ratio of 1: (0.1 to 0.5): (0.1 to 0.3): (0.3 to 0.4): (0.1 to 0.3) through reaction. The benzoxazine-containing waterborne polyurethane sizing agent is used for modifying the aramid fibers, and benzoxazine is crosslinked with the aramid fibers and the epoxy resin during ring opening polymerization, so that the interface bonding property between the aramid fibers and the epoxy resin can be remarkably improved, and the mechanical property of the composite material can be effectively improved; the application field of the aramid fiber composite material is expanded.

The invention discloses an EGCG preparation with ultrahigh stability and an efficient anti-aging effect and a preparation method and application thereof. EGCG is firstly entrapped by a polymer wall material, and then the polymer wall material and a cross-linking agent containing two boric acid groups are subjected to an esterification reaction to obtain the EGCG preparation; the mass ratio of the polymer wall material to the cross-linking agent is 1: (0.5-2.0); the polymer wall material has amphipathy, and is obtained by performing ring-opening polymerization reaction on a polymeric monomer epsilon-caprolactone to obtain polycaprolactone, performing bromination reaction to obtain brominated polycaprolactone, and performing atom transfer radical polymerization reaction on a polymeric monomer poly (ethylene glycol) methacrylate. According to the invention, boric acid ester bonds are generated through a cross-linking reaction, and EGCG is firmly wrapped by a unique net structure of the boric acid ester bonds, so that the EGCG has better stability; in addition, in a high reactive oxygen species (ROS) environment, EGCG can be efficiently released, and then the efficient antioxidant effect is achieved.

The present invention provides a mechanically interlocking epoxy resin polymer, a preparation method, and an application thereof. The raw materials for preparing the mechanically interlocking epoxy resin polymer include pillar aromatic hydrocarbon daisy chain polyurethane, epoxy resin, and a crosslinking agent. In the present invention, the pillar aromatic hydrocarbon daisy chain polyurethane, epoxy resin, and crosslinking agent are ring-opening polymerized to form a mechanically interlocking polymer containing a daisy chain. The crosslinking agent crosslinks the polymer containing the daisy chain into a network. The prepared mechanically interlocking epoxy resin polymer has dynamic properties, which mainly come from the host-guest recognition effect of the pillar aromatic hydrocarbon and triazole. This dynamic property can improve the mechanical properties and energy dissipation of traditional epoxy resins, allowing the epoxy resin to withstand greater stress, enhancing its toughness, and promoting maximum elongation and ductility without sacrificing the mechanical strength of the polymer.

The invention discloses a quasi-solid electrolyte and a preparation method thereof, a battery and an electric device. The preparation method comprises the following steps: mixing electrolyte salt with a carbonic ester solvent to prepare a basic electrolyte; a diluent and an initiator are added into the basic electrolyte for a reaction, and a quasi-solid electrolyte is prepared; the diluent comprises a cyclic monomer diluent capable of being subjected to ring opening polymerization, and the mass ratio of the diluent to the initiator to the basic electrolyte is (30-70): (0.1-0.5): (30-70) in sequence. In the preparation process of the quasi-solid electrolyte, a precursor solution containing a local high-concentration solvation structure is formed, and the quasi-solid electrolyte which is low in impedance, high in ionic conductivity, excellent in high-rate performance and good in safety performance is prepared by utilizing an in-situ polymerization technology. The quasi-solid electrolyte prepared by the invention is assembled into a battery, has excellent charge-discharge performance, shows excellent cycle stability under a high-rate condition, and is low in economic cost and high in practicability.

The invention belongs to the technical field of chemical power sources and energy storage, and particularly discloses a high-safety sodium ion battery electrolyte and a battery, and the electrolyte comprises a sodium salt, a carbonate solvent and polycyclic siloxane. When a negative electrode-electrolyte interface layer is decomposed, a fresh hard carbon surface is exposed, and the temperature of the battery also reaches a ring opening temperature, so that a three-membered ring or four-membered ring siloxane monomer is subjected to ring opening polymerization to generate a passivation layer covering the hard carbon surface, the negative electrode-electrolyte interface layer is protected, heat release side reaction of a negative electrode and electrolyte is inhibited, and the service life of the battery is prolonged. The three-membered ring or four-membered ring siloxane generates SiO2 at high temperature, and further development of thermal runaway is prevented; the stability of the negative electrode-electrolyte interface layer of the sodium-ion battery and the safety of the battery can be improved at the same time, and other prior art cannot give consideration to the stability; according to the invention, the damaged negative electrode-electrolyte interface layer can be repaired in real time, and thermal runaway can be inhibited.

The invention relates to the technical field of wire and cable insulating materials, and provides a room-temperature self-crosslinking flame-retardant insulating material and a preparation method thereof.The preparation method comprises the steps that a magnetic metal hydroxide flame retardant is prepared through a sol-gel method, and modified vinyl silane is prepared through a ring-opening polymerization reaction; the preparation method comprises the following steps: performing ordered grafting granulation on polyolefin resin, a magnetic metal hydroxide flame retardant and modified vinyl silane to prepare matrix granules; and blending the matrix granules with the catalytic granules, carrying out extrusion molding on the blended granules, and standing at room temperature to obtain the room-temperature self-crosslinking flame-retardant insulating material. According to the room-temperature self-crosslinking flame-retardant insulated cable and the preparation method thereof, the flame retardant property can be improved, the crosslinking efficiency and cost can be optimized, and the mechanical property and the insulating property can be optimized.

The invention provides a gel electrolyte with a controllable polymerization degree, a preparation method of the gel electrolyte, a semi-solid lithium ion secondary battery and a preparation method of the semi-solid lithium ion secondary battery, and relates to the technical field of lithium ion batteries. Raw materials for preparing the gel electrolyte comprise a cyclic ether monomer, an initiator and a polymerization inhibitor; the cyclic ether monomer is subjected to ring opening polymerization to obtain an ether polymer; the polymerization inhibitor is an inorganic lithium salt, and the polymerization degree of the gel electrolyte is determined by the dosage of the polymerization inhibitor and the dosage of the initiator. The gel electrolyte provided by the invention has the fluidity advantage of a liquid electrolyte and the flexibility advantage of a solid polymer electrolyte, and is beneficial to maintaining a stable contact interface between the electrolyte and an electrode, reducing interface impedance and improving ion transmission.

The invention discloses a polymer solid electrolyte, a lithium ion battery and a preparation method. The polymer solid electrolyte comprises a polymer electrolyte, a lithium salt and an additive, the lithium salt initiates the polymer electrolyte to perform in-situ polymerization; the polymer electrolyte is poly (1, 3-dioxolame) obtained by ring opening polymerization of 1, 3-dioxolame. The in-situ polymerization high-concentration salt polymer solid electrolyte has good interface contact with an electrode, so that ion transmission at an interface is optimized; due to poor fluidity of the polymer, a construction site of a solid-state inter-electrolyte phase (SEI) is moved from the surface of an electrode particle to an electrode / electrolyte interface, and the volume change rate is far smaller than that of the surface of the particle, so that the SEI is essentially prevented from bearing huge stress of volume expansion.

The present invention relates to a process to manufacture lignin-based polyols (LBP) by ring opening polymerization (ROP) of oxiranes in the presence of lignin and in an organic solvent or mixture thereof using acidic catalysts. The LBP are suitable to manufacture polyurethanes, polycarbonates and polyesters.

The invention relates to a preparation method of a high molecular weight poly (alkyl oxalate) homopolymer and copolymer, and belongs to the technical field of polymer synthesis. According to the method disclosed by the invention, bulk chemical oxalic acid diester and aliphatic diol are used as raw materials, and a process route of synthesizing an oxalic acid alkyl ester oligomer through polycondensation, preparing an oxalic acid alkyl cyclic lactone monomer through controllable depolymerization and preparing poly (oxalic acid alkyl ester) through ring opening polymerization of the oxalic acid alkyl cyclic lactone monomer is adopted, so that oligomeric oxalic acid alkyl ester can be prepared through polycondensation; a controllable depolymerization process is adopted to efficiently prepare a high-purity alkyl oxalate cyclic lactone monomer, and a high-efficiency catalyst is adopted to realize controllable ring opening polymerization of the alkyl oxalate cyclic lactone monomer to prepare a high-molecular-weight poly (alkyl oxalate) homopolymer. In the ring-opening polymerization process, a chain structure and a sequence structure of a polymer are adjusted by adopting a copolymerization means to prepare the high-molecular-weight poly (alkyl oxalate) copolymer, so that controllable preparation of oxalate-based polyesters with different structures and properties is realized, and the use requirements of different application scenes can be met.

The invention discloses vinyl fluorine-containing polysiloxane and a preparation method thereof, and relates to the technical field of organic silicon materials. According to the invention, high-activity fluorine-containing potassium hydroxide silanolate is used as a catalyst to realize high-efficiency catalysis; d3F serves as a main monomer, D3Vi serves as a comonomer, deionized water is introduced for the first time to serve as a retarder, and implosion is effectively inhibited; vinyl dimethyl ethyoxyl silane is used as an end-capping reagent for the first time, end group vinylation is synchronously realized, and end group and side chain divinyl polysiloxane is prepared; through cooperation of ring-opening polymerization and condensation polymerization, the reaction process is mild and controllable, the product viscosity is controllable, the crosslinking activity is high, and the application range is remarkably widened.

The invention discloses a gelatinized and / or micronized nucleoside drug and a preparation method thereof, and belongs to the technical field of drugs. The preparation method comprises the following steps: mixing lipoic acid, a nucleoside drug and an esterification catalyst, carrying out a grafting reaction in a reaction solvent to obtain a lipoic acid grafted nucleoside drug, dispersing the lipoic acid grafted nucleoside drug in an organic solvent to obtain a dispersion liquid, dropwise adding the dispersion liquid into hot water, and carrying out ring opening polymerization to obtain the lipoic acid grafted nucleoside drug. The nucleoside drug nanogel, nanoparticle or nanofiber is obtained, and the structure and performance improvement based on the drug itself is realized. The gelated and / or micronized nucleoside medicine prepared by the invention has obviously improved scavenging rates of DPPH free radicals and ABTS free radicals, and the method can improve the oxidation resistance of the nucleoside medicine and has the characteristic of improving the stability and functionality of the medicine.

The invention provides a polyoxyalkylene ether macromonomer, a preparation method and application of the polyoxyalkylene ether macromonomer in preparation of a polycarboxylate superplasticizer, the polyoxyalkylene ether macromonomer is obtained by performing ring-opening polymerization reaction on an initiator and an alkylene oxide monomer under the action of a deprotonation reagent, and the initiator is allyl mercaptan or methyl and phenyl substituted allyl mercaptan. The polycarboxylate superplasticizer is obtained by free radical copolymerization reaction of an acid monomer and the polyoxyalkylene ether macromonomer under the action of an initiator and a reducing agent. Allyl sulfide is easy to generate uniform cracking of carbon-sulfur bonds in the polymerization process, polyoxyalkylene ether sulfydryl free radicals are generated, chain transfer is achieved, in the chain transfer process of the polyoxyalkylene ether macromonomer, a transferred chain still retains terminal double bonds and can participate in polymerization again, and the polyoxyalkylene ether macromonomer has a good polymerization effect. Therefore, polycarboxylic acid synthesized by using the polyoxyalkylene ether macromonomer has a certain branched topological structure, and cement paste dispersed by the polyoxyalkylene ether macromonomer has better workability.

The invention provides a lipoic acid-based nano-enzyme and a preparation method and application thereof, firstly, lipoic acid is dissolved in an organic solvent by utilizing the amphipathy of the lipoic acid and is self-assembled in water to form a nano-aggregate, and then ring opening polymerization of the lipoic acid is initiated by ultraviolet irradiation to obtain stable lipoic acid nano-particles, namely the lipoic acid-based nano-enzyme. The lipoic acid-based nano-enzyme has the beneficial effects that the preparation method of the lipoic acid-based nano-enzyme prepared by the method is simple, the lipoic acid-based nano-enzyme has stable particle size, good active oxygen scavenging ability and blood brain barrier crossing ability, and in addition, a cavity in the nano-enzyme is suitable for loading hydrophobic bioactive factors and drugs, so that the lipoic acid-based nano-enzyme has a good application prospect. Rich carboxyl groups on the surface of the nano-enzyme can be complexed with various ions, and the nano-enzyme can be applied to treatment of inflammation diseases caused by hypoxia or ischemia and the like and brain drug delivery.

The invention discloses a boron-modified polybenzoxazine aerogel flame-retardant heat-insulating material and a preparation method thereof, and aims to solve the problems that the existing polybenzoxazine aerogel flame-retardant heat-insulating material is low in flame retardance, high in heat conductivity, unsafe and not environment-friendly in preparation process and the like. The preparation method of the flame-retardant heat-insulating material comprises the following steps: dissolving an alcohol-soluble benzoxazine monomer in an alcohol solvent, adding a boron compound into the alcohol solvent to modify benzoxazine, pouring the reaction solvent into a hydrothermal reaction kettle by adopting a solvothermal method, heating together, performing ring opening polymerization on the benzoxazine monomer at the temperature of 100-160 DEG C to prepare boron modified polybenzoxazine initial state gel, and preparing the boron modified polybenzoxazine initial state gel into the flame-retardant heat-insulating material. And then performing aging, solvent replacement and normal-temperature and normal-pressure drying operation. The production process is simple, the preparation process is environment-friendly and low in cost, solvents participating in the reaction are low in toxicity, and safety and environment friendliness can be achieved; the prepared thermal insulation material has the advantages of small density, low thermal conductivity, limit oxygen index greater than 29, and good thermal insulation effect.