413 results about "Ring-opening polymerization" patented technology

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.

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 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 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 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 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 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 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.

The invention belongs to the technical field of fine chemical synthesis, belongs to a nonionic short fluorine chain surfactant, and relates to a preparation method of a fluorinated polyether surfactant. The preparation method comprises the following steps: reacting trimethylolethane with a hydrogen bromide acetic acid solution to prepare an intermediate 1; reacting the intermediate 1 in an alkaline environment without an organic solvent to prepare an intermediate 2; reacting the intermediate 2 with pentafluoropropanol under the action of potassium hydroxide and a catalyst 1 to prepare a fluorinated monomer; finally, the fluorinated monomer is subjected to ring opening polymerization under the action of an initiator and a catalyst 2, and the fluorinated polyether type surfactant is prepared. The method has the advantages of easily available raw materials, mild reaction conditions, simple synthesis, low cost, high yield and short fluorine chain of the product, can replace a long-chain fluorine-containing surfactant which is difficult to degrade, and can be used as an additive in the fields of photoresists, coatings, adhesives and the like. The surface tension can be obviously reduced, the surface defects of a coating can be reduced, and the appearance can be improved by adding a very small amount of the surface tension reducing agent.

The present invention relates to a bismuth-containing catalyst of formula (R1)2-(R2)-(Bi)3+ (I), wherein (R1)2- is a dianion of formula (II*), wherein A is unsubstituted or at least monosubstituted linear C3-30-alkylene, wherein at least two not adjacent CH2 groups of C3-30-alkylene are replaced by a heteroatom independently selected from the group consisting of O, S, 5 NH, N-C1-30-alkyl, N-C6-14-aryl and N-C7-30-aralkyl, wherein alkyl and aryl fragments of N-C1-30-alkyl, N-C6-14-aryl, N-C7-30-aralkyl may at least be monosubstituted by hydroxyl, halogen, -CF3, NH2, -NH-C1-6-alkyl, -NH- phenyl, -N(C1-6-alkyl)2, -N(phenyl)2, -SH, -S-C1-6-alkyl, -S-phenyl, -O-C1-6-alkyl or -O-phenyl, to process for the preparation of the bismuth containing catalyst, to a process for the preparation of a compound, oligomer or polymer comprising at least one urethane group using the bismuth-containing catalyst, to a composition comprising (i) at least one monoalcohol (B1) or polyol (B2), (ii) at least one polyisocyanate (A) and (iii) the bismuth-containing catalyst, to a coating or adhesive layer formed from the composition on a substrate, to a foam formed from the composition, and to the use of the bismuth-containing catalyst in for preparing compounds, oligomers or polymers comprising a urethane group, as esterification and transesterification catalyst and as catalyst for ring-opening polymerizations of lactones and epoxides.

The application discloses a modified polyurethane water-based functional coating and a preparation process thereof, and belongs to the technical field of water-based functional coatings. In the application, N,N-dimethylethanolamine is used as a blocking agent to block the isocyanate prepolymer, so that a latent type blocked isocyanate water-based polyurethane emulsion is prepared; lactide monomers, epoxy group grafted modified nano silicon dioxide and amino functionalized light stabilizer microcapsules are added into the emulsion; curing is carried out by using a two-stage process, that is, after preheating and water removal and film formation, 130-150 DEG C baking is carried out to trigger the deblocking of the DMEA blocked isocyanate, and the tertiary amine groups in the deblocked DMEA molecules immediately initiate the ring-opening polymerization of the premixed lactide monomers in the system in situ to generate polylactic acid segments which are chemically grafted to the crosslinked network. The application realizes the synchronous linkage of crosslinking and curing and polymer toughening, and the obtained coating has the characteristics of high crosslinking density, excellent flexibility and low internal stress.

The invention relates to a P-N synergistic chitosan bio-based flame retardant and a preparation method thereof.The preparation method comprises the steps that chitosan is heated and dissolved in an acetic acid solution, nitrogen is introduced, an initiator is added, then a DOPO derivative with double bonds at the tail end, MDO and AA are added for a polymerization reaction, and the flame retardant is prepared. An environment-friendly biological material chitosan is used as a base material, a DOPO derivative with a P-N flame retardant property and a terminal double bond is firstly prepared, then the DOPO derivative, degradable MDO formed through ring opening polymerization and acrylic acid are jointly subjected to graft polymerization on the surface of the chitosan, and a formed macromolecular polymer chain has high flame retardance and can be degraded into a low-molecular structure; the chitosan-based macromolecule containing PCL and PAA chain segments has a biological environmental protection property, and when the chitosan-based macromolecule containing PCL and PAA chain segments is added into degradable plastics such as PLA, the chitosan-based macromolecule can also achieve good compatibility with plastic particles, so that the degradable plastics can be endowed with certain flame retardant property, and meanwhile, the chitosan-based macromolecule has good compatibility with the plastic particles, so that the degradation rate can be kept unaffected.

The invention discloses a high-thermal-conductivity self-adhesion thermal interface material and a preparation method thereof, and is characterized in that polylipoic acid (polyTA) formed by high-temperature ring opening polymerization of lipoic acid (LA) is used as a dynamic reversible polymer matrix, the dynamic reversible polymer matrix has the characteristics of recoverability, self-healing and adhesion due to the inherent dynamic property of disulfide bonds, a spherical thermal conductive filler is modified by a polyphenol compound, and the high-thermal-conductivity self-adhesion thermal interface material is prepared. Polyhydroxy functional groups are given, the surface energy is reduced, meanwhile, certain viscosity is achieved, polyethylene glycol diacrylate is added to serve as a stabilizer, ferric iron salt is evenly stirred and mixed, the reaction time is controlled, and a stable cross-linked network system is constructed. Hydroxyl groups on the surface of the polyphenol-decorated heat-conducting filler and carboxyl groups in polylipoic acid are subjected to esterification reaction, and meanwhile, Fe < 3 + > and the carboxyl groups in the polylipoic acid form supramolecular coordination, so that uniform dispersion and stable bonding of the filler in a matrix are realized, the interface thermal resistance is remarkably reduced, and a continuous heat-conducting passage is formed. The preparation method of the thermal interface material is simple in process, and the thermal interface material has high thermal conductivity and self-adhesion, has soft elasticity and is suitable for various application fields needing efficient thermal conduction and interface thermal management.

The invention discloses a biodegradable polypeptide-based circularly-polarized room-temperature phosphorescent material and a preparation method thereof, and relates to the technical field of photo-electromagnetic functional polymer materials. According to the invention, L-type or D-type glutamic acid-N-carboxyl anhydride is used as a monomer, and a small molecule initiator containing a phosphorescent element is adopted to initiate ring-opening polymerization to form chiral polypeptide; based on the chiral polypeptide, the biodegradable polypeptide-based circularly polarized room-temperature phosphorescent material is prepared through high-temperature drop casting and annealing treatment. The material prepared by the invention has excellent circular polarization room temperature phosphorescence performance and complete biodegradability, has wide application prospects in the fields of information encryption, biological probes, environment-friendly optical devices and the like, and realizes cooperation and unification of a high-performance photoelectric function and green sustainable development.

The invention provides a rubber composition, seam allowance glue as well as a preparation method and application of the seam allowance glue. The rubber composition comprises natural rubber, butadiene rubber, modified polypropylene oxide, an inorganic filler, an anti-aging agent and a vulcanizing agent, the modified polypropylene oxide is obtained by carrying out ring-opening polymerization reaction on propylene oxide and a modified monomer, and the modified monomer is a C4-C8 organic compound containing one epoxy group and at least one alkenyl group. Double bonds in a side chain of the modified polypropylene oxide can react with unsaturated double bonds in natural rubber and butadiene rubber in the vulcanization process to form a more compact and stable three-dimensional cross-linked network structure, and meanwhile, the modified polypropylene oxide also contains a large number of saturated-C-O-bonds, so that when the modified polypropylene oxide is introduced into a rubber molecular chain, the molecular weight of the rubber is reduced, and the service life of the rubber is prolonged. On one hand, the resistance of a rubber molecular chain to oxidation reaction can be improved, and the thermo-oxidative aging resistance and the ozone aging resistance are improved; on the other hand, the rigidity of rubber molecular chains can be increased, and the thermal stability and mechanical properties are enhanced.

The invention provides a degradable fiber temporary plugging agent and a preparation method thereof, and belongs to the technical field of oil-gas field development. The temporary plugging agent is composed of polylactic acid-polyurethane block copolymer fibers, and the preparation method of the temporary plugging agent comprises the steps that S1, lactide and an initiator containing dihydroxyl are subjected to ring opening polymerization under the action of a first catalyst, and a hydroxyl-terminated prepolymer is formed; s2, reacting the prepolymer with diisocyanate under the action of a second catalyst to synthesize a polylactic acid-polyurethane block copolymer; s3, preparing fibers through a melt spinning or electrostatic spinning process; the degradation rate and the mechanical property of the fiber can be regulated and controlled by regulating and controlling the initiator type, the diisocyanate type, the isocyanato index R value and the catalyst dosage, so that the fiber is suitable for the wide-temperature-range reservoir conditions of 45-120 DEG C, and the technical problems of contradiction between the strength and the degradability, narrow temperature adaptability, secondary damage to the reservoir and the like of a traditional temporary plugging agent are effectively solved.

The invention relates to the technical field of lithium ion batteries, and discloses a disulfide bond dynamic network binder for a silicon-based negative electrode plate, and a preparation method and application thereof, and the preparation method comprises the following steps: carrying out ring opening polymerization on lipoic acid and derivatives thereof, and reacting with a functional monomer containing carbon-carbon double bonds capable of free radical polymerization to obtain a disulfide bond dynamic network binder; the binder containing the disulfide bond dynamic network structure is obtained; the functional monomer is a cross-linking / film-forming monomer or a mixture of the cross-linking / film-forming monomer and a monomer carrying a functional side group; according to the binder disclosed by the invention, reversible network reconstruction is realized through disulfide bond exchange, high binding power and pulverization resistance are considered, continuity of a conductive / ion channel can be maintained, surface resistance of a pole piece is reduced, and cycling stability and rate capability are improved. No additional solvent is added in the whole process, the process is simple, cost is low, and the method is suitable for continuous large-scale production.

The invention discloses phenolic modified silicone oil as well as a preparation method and application thereof. The phenolic group modified silicone oil comprises end hydrogen-containing silicone oil, hydroxyl acrylate, tetramethyl cyclotetrasiloxane and alkene phenol, wherein the molar ratio of the hydrogen group to the hydroxyl acrylate to the tetramethyl cyclotetrasiloxane to the alkene phenol in the end hydrogen-containing silicone oil is 1: (2.1-2.3): (3-5): (3.3-6.5); carrying out hydrosilylation on the end hydrogen-containing silicone oil and hydroxyl acrylate to obtain hydroxyl silicone oil; the preparation method comprises the following steps: carrying out ring opening polymerization on hydroxyl silicone oil and tetramethylcyclotetrasiloxane to obtain side hydrogen modified hydroxyl silicone oil; and carrying out hydrosilylation on the side hydrogen modified hydroxyl silicone oil and alkene phenol to prepare the phenolic group modified silicone oil. The reaction activity of the phenolic modified silicone oil can be effectively improved, good chemical bonding of the phenolic modified silicone oil and a polymer matrix is achieved, and then the hydrophobicity and oxidation resistance of the material are improved.

The application provides a method for preparing phenyl silicone rubber raw rubber by one-pot method, comprising the following steps: (1) adding a siloxane ring body and an end-capping agent to prepare a premix; (2) adding a catalyst to the premix obtained in step (1) to perform a first-stage ring-opening polymerization reaction, and continuously adding a cocatalyst to perform a second-stage ring-opening polymerization reaction; (3) adding a neutralizing agent to the ring-opening polymerization product of step (2) to continuously react to obtain phenyl silicone rubber raw rubber. The ring-opening polymerization reaction is completed in 3-6 hours, further, no gas is released at high temperature, and no adverse effect on the mechanical properties of the silicone rubber is caused. The ring-opening polymerization reaction is carried out by means of drum inert gas and short-range vacuum polymerization technology throughout the whole process, the content of hydroxyl groups can be effectively controlled, and the product distribution width is greatly improved.

Methods for coating electrodes, particularly anodes, more particularly lithium anodes in batteries. The coating material obtained by the methods, involves the ring-opening polymerization of dioxolane (DOL) monomers in presence of suitable polymerization initiators, crosslinkers and optional further additives. The so-obtained coating material displays advantageous features such as fast lithium ions diffusion and high conductivity, high elastic modulus blocking dendrite formation, high flexibility, scalability, controllable thickness of the coating material and homogeneity on the anode surface. The corresponding electrochemical cells and / or batteries comprising the coating material, are characterized by improved stability during the cell / battery cycling.

The application discloses a kind of in-situ gel preparation methods, belong to lithium metal battery technical field.The method introduces trace initiator to make 1,3-dioxolane DOL in electrolyte occur ring-opening polymerization reaction, by forming DOL crosslinking in advance, realize liquid ether-based electrolyte in-situ solidification on the surface of lithium negative electrode.After forming gel phase, inject electrolyte in soft pack battery of gel phase, construct gel phase@liquid phase two-phase system.By controlling the ratio of electrolyte and poly-DOL, realize the gradient solidification of ether-based electrolyte in battery, adjust the mechanical properties of gel electrolyte.There is intermolecular interaction between poly-DOL and lithium salt anion, significantly improve the ionic conductivity and lithium ion transference number of gel electrolyte, the in-situ gel phase formed has good interface compatibility with lithium negative electrode, and the growth of lithium dendrite is inhibited.This in-situ gel preparation method is low in cost and easy to operate, and is a simple method to realize high capacity and high cycle stability of lithium metal battery.

The application discloses a kind of deformation-resistant thermoplastic composite material and preparation method thereof, belong to high polymer composite material preparation technical field, to solve the existing thermoplastic composite material under high load prone to creep, fiber infiltration is insufficient and the problems such as insufficient part size stability.The application uses cyclic butylene terephthalate oligomer as low-viscosity precursor, introduces bifunctional catalytic crosslinking agent, and carries out in-situ reactive molding with glass fiber reinforcement.The method utilizes the low melt viscosity of cyclic butylene terephthalate oligomer, realizes the sufficient infiltration of fiber reinforcement before polymerization and viscosity increase, and constructs a covalent crosslinking network containing dynamic ester exchange bond in-situ during ring-opening polymerization.The obtained composite material has low porosity and good interface bonding, and significantly improves the anti-creep performance and dimensional stability while maintaining the toughness of thermoplastic materials.

The invention relates to the technical field of nylon resin, and particularly provides nylon resin and a preparation method thereof. The preparation method comprises the following steps: adding a lactam monomer, an end-capping reagent, a catalyst and water into a polymerization reactor for ring-opening polymerization, and releasing pressure to normal pressure; the polymerization reactor is purged until the water content of the purged gas is smaller than 500 ppm, then an antioxidant is added, for example, the sum of the mass ratio of the end-capping reagent to the catalyst to the lactam monomer is not larger than 0.0045, the mass ratio of the lactam monomer to the antioxidant is 1: (0.0001-0.005), and otherwise, the mass ratio of the end-capping reagent to the catalyst to the antioxidant is 1: (0.0001-0.002); vacuumizing, discharging after staying, and dicing; the obtained nylon resin has few impurities, a yellow value as low as-8 to-6, molecular weight distribution of 4-5, high notch impact strength, strong toughness and excellent low temperature resistance, and can be used for automobile oil pipes and gas transportation pipelines in cold regions.

The invention discloses a gallic acid-based cationic photodynamic antibacterial agent with sterilizing, anti-infection and wound healing promoting effects and a preparation method thereof, and belongs to the technical field of antibacterial agent synthetic chemistry. The cationic photodynamic antibacterial agent EY-QEGDM-MG is prepared by taking a natural compound gallic acid as a raw material and carrying out ring opening polymerization and quaternization reaction with photosensitizer eosin EY and ethylene glycol diglycidyl ether (EGDE), and the polymer shows an excellent antibacterial effect on escherichia coli and multi-drug-resistant MRSA germs under the action of illumination, and can be used for preparing a cationic photodynamic antibacterial agent EY-QEGDM-MG. The polymer has good blood compatibility and cell compatibility, in addition, the polymer can kill bacteria around infected wounds and can rapidly promote wound healing, and therefore the polymer can provide a new method for photodynamic antibacterial agents for treating the infected wounds in hospitals.