553 results about "Ring-opening polymerization" patented technology

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 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 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 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 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 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 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 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 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.

The invention relates to the field of silicone hydrogel materials, in particular to a contact lens silicone hydrogel material with good flexibility and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out cation ring opening polymerization under 350-370 nm UV light to form a prepolymer A containing unreacted epoxy groups and vinyl; and then mixing the prepolymer A with an amido-containing hydrophilic monomer, a free radical cross-linking agent and a photothermal initiator, and carrying out second-stage polymerization under 380-410 nm UV light to form a three-dimensional network structure with an ether bond flexible interface and C-C bond strength. The method breaks through the phase separation bottleneck of traditional single-stage polymerization, the phase separation size is reduced, and the optical transparency and stability are improved. Through chemical bridging of an epoxy group and an amide group, molecular-level bonding of a siloxane phase and a water phase is realized, and flexibility and wearing comfort are improved. By introducing the flexible chain segment regulator, the flexibility of the molecular chain is enhanced, the modulus is reduced, and meanwhile, high oxygen permeability and low protein adsorbability are kept.

The invention provides a preparation method of a single-ended vinyl hyperbranched polyether macromonomer, which can be applied to the technical field of hyperbranched polyether synthesis. The method comprises the following steps: carrying out ring-opening polymerization reaction on any one of an epoxy group-containing vinyl monomer, a hydroxyl group-containing vinyl monomer or a carboxyl group-containing vinyl monomer and glycidol in the presence of a catalyst and a polymerization inhibitor to form the single-ended vinyl hyperbranched polyether macromonomer with an amino group, ester group or ether group structure. The invention also provides a single-ended vinyl hyperbranched polyether macromonomer product.

The invention discloses a fluorine release film for a high-viscosity silica gel protective film of an AF glass screen and a preparation method of the fluorine release film, and belongs to the technical field of unsaturated polyester, raw materials are uniformly mixed and coated on a PET base material, during high-temperature heat preservation, part of double bonds on a modified release agent and a modified filler can react with silicon-hydrogen bonds on hydrogen-containing silicone oil under the action of chloroplatinic acid, so that the fluorine release film is formed. The modified filler and the modified release agent are grafted by residual double bonds on the modified filler and the modified release agent under the action of 2, 4, 6-trimethylbenzoyl-diphenyl phosphine oxide through ultraviolet irradiation, so that the modified filler is more thoroughly contacted with polymer molecules, a stable conductive grid can be formed during raw material curing, and the conductivity of the conductive grid is improved. Meanwhile, under the action of triphenyl sulfonium hexafluorophosphate, an expanding monomer DB-TOSU is subjected to double-ring-opening polymerization to form bicyclic acetal, the bicyclic acetal is converted into carbonyl and hydroxyl, and the carbonyl and hydroxyl are matched with a polyhedral oligomeric silsesquioxane structure on the modified filler, so that the smoothness of the surface of the release film is ensured.

The invention discloses a preparation method of antibacterial modified polylactic acid for a packaging material, and belongs to the technical field of functional modification of polylactic acid.The preparation method comprises the steps that an antibacterial barrier type polylactic acid composite material is prepared through ring opening polymerization of an initiator, grafting of antibacterial molecules and blending of montmorillonite, a chlorine-terminated initiator is generated from ethanolamine and chloroacetyl chloride, and the antibacterial modified polylactic acid is prepared; the preparation method comprises the following steps: initiating ring-opening polymerization of L-lactide to form polylactic acid with terminal group activity, covalently grafting terminal group chlorine with an antibacterial modifier through nucleophilic substitution, endowing the polylactic acid with antibacterial property, coupling modified montmorillonite with silane through organic intercalation, and then carrying out melt blending with the modified polylactic acid with antibacterial property to form a layered barrier structure and enhance interface bonding. Therefore, the film has the advantages of high barrier property, high tensile strength, excellent antibacterial activity and good degradability.

The invention belongs to the technical field of battery materials, and provides a granulation additive and a manufacturing method of a high-reliability lithium ion battery using the granulation additive. The granulation additive is polyether water-soluble resin obtained by carrying out ring-opening polymerization reaction on an organic compound A under the action of an organic weak base compound B serving as an initiator and a solvent C, the granulation additive has high cohesiveness and good conductivity, and can be used as a flexible binder to be matched with a conventional binder for use. The granulation additive has bonding and granulation effects in a positive electrode granulation process, has the functions of smoothing positive electrode powder particles and improving the uniformity of the positive electrode powder, and can solve the problems of poor bonding force, stability reduction and internal resistance increase under a high-temperature use working condition when only a conventional binder is used by using the granulation additive. And the stability and reliability of the positive electrode and the battery cell are effectively improved.

The invention discloses a method for preparing a high-performance polyalkylene oxide compound through catalyst modification and application of the high-performance polyalkylene oxide compound. An ammonia-calcium catalyst system is modified, an MgAl oxide mesoporous material which can provide an Al active site and can also serve as a carrier is introduced to serve as a cocatalyst, in cooperation with a conventional carrier, the ring-opening polymerization effect of epoxide, especially branched-chain epoxide is improved, full polymerization of branched-chain alkane is achieved, and the high conversion rate of 96% or above is achieved; meanwhile, the molecular weight can be controlled, and the molecular weight can be further increased. Compared with polyoxyethylene, the polyalkylene oxide prepared by the invention has better flexibility and mechanical properties, and can improve the problem that polyoxyethylene is fragile. And meanwhile, the crystallinity of the product is also reduced, and the proportion of an amorphous region is increased. Compared with traditional PEO, in the aspect of solid electrolyte, the crystallinity and the melting point of the PEO are reduced, the ionic conductivity and the mechanical property of the PEO are improved, and the electrochemical performance is improved.

The invention relates to a preparation method of an aliphatic amine polyester ether surfactant and a compound ionic oil-displacing agent thereof, and relates to the technical field of oil field chemicals, the preparation method comprises the following steps: taking aliphatic amine as a raw material, and carrying out ring opening polymerization on the aliphatic amine and ethylene carbonate at a certain temperature under the action of a catalyst to prepare an aliphatic amine polyester ether nonionic surfactant; and compounding the fatty amine polyester ether nonionic surfactant with an anionic surfactant, a cationic surfactant, a phase solvent and water according to a certain proportion to prepare the composite ionic oil displacement agent. The fatty amine polyester ether and the composite ionic oil-displacing agent thereof are superior to a single naphthenic acid amide polyether ester sulfonate anionic oil-displacing agent in the aspects of synergistic effect, stability, salt resistance, hard water resistance, adsorption resistance, interfacial tension stability and binary system oil-displacing performance.

The present invention relates to the technical field of high polymer material synthesis, and discloses an anti-clogging microreactor for high viscosity silicone rubber synthesis, the anti-clogging microreactor comprises a microreactor chip, and the interior of the microreactor chip is provided with a tree-shaped bifurcated microchannel network based on fractal structure design; the invention relates to a continuous preparation method of an anti-clogging microreactor for synthesizing high-viscosity silicone rubber. The continuous preparation method comprises the following steps: S1, precisely metering a methyl cyclosiloxane monomer and a vinyl siloxane monomer, and then inputting the methyl cyclosiloxane monomer and the vinyl siloxane monomer into the microreactor; s2, carrying out a controllable ring-opening polymerization reaction in the microchannel; and S3, quickly terminating the reaction by injecting a terminating agent on line, and controlling the molecular weight and distribution of the polymer. Compared with the prior art, the method has the advantages that the problems that an existing microreactor is prone to blockage and difficult to operate stably for a long time when treating a high-viscosity siloxane polymerization system are solved, meanwhile, the method can achieve accurate control over product quality and continuity and intellectualization of the production process, the production efficiency is remarkably improved, and energy consumption is reduced.

The invention provides a modified nano polysaccharide composite polylactic acid biomedical material as well as a preparation method and application thereof, and belongs to the technical field of biomedical polymer composite materials. Hydrophobic modification is carried out on the surface of the nano polysaccharide by utilizing hydroxyapatite, so that the compatibility of the nano polysaccharide and a matrix can be effectively improved, a good enhancement effect on polylactic acid is achieved, and the polylactic acid has a proper degradation rate. According to the preparation method, polylactic acid is grafted to the surface of hydroxyapatite modified nano polysaccharide in a ring-opening polymerization mode, aggregation of hydroxyapatite can be avoided, the modified nano polysaccharide serving as a nucleating agent plays a positive role in the crystallization process of a polymer matrix, the crystallinity of the composite material is improved, and the performance of the composite material is improved. The mechanical property of the obtained material is further improved.

The invention discloses a high-refractive-index-difference bottle brush block polymer and a synthetic method of a degradable structural color material, and belongs to the technical field of organic polymers. The end group of the high-refractive-index degradable macromonomer is a cycloolefin derivative capable of performing sequential ring-opening metathesis polymerization reaction (ROMP), and the main chain is a degradable polymer prepared by performing ring-opening copolymerization reaction on styrene oxide (SO) and a comonomer. A series of novel degradable cycloolefin macromonomers are designed and synthesized to replace polystyrene and other non-degradable high-refractive-index polymers commonly used in the field, and the macromonomers and a block copolymer brush are synthesized through ring-opening polymerization and ring-opening metathesis polymerization. And an environment-friendly structural color material capable of covering a full visible light wave band is further prepared by utilizing a phase separation mechanism.

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.