260 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.

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 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 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 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 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.

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 beta-ketimine type binuclear aluminum complex and a preparation method thereof. The binuclear aluminum complex can be used for catalyzing ring opening polymerization of caprolactone, lactide, glycolide, valerolactone, butyrolactone or ethylene carbonate. The invention further discloses a preparation method and application of the binuclear aluminum complex. The preparation method is simple, the reaction condition is mild, the prepared beta-ketimine type binuclear aluminum complex is used as a catalyst, the catalytic activity is high, the stability is good, the service life is long, the molecular weight distribution of the obtained polymerization product is narrow, and the beta-ketimine type binuclear aluminum complex can be well applied to the ring-opening polymerization reaction of cyclic ester.

This invention relates to an electrolyte for lithium-ion batteries or lithium metal batteries, a method for preparing the electrolyte, and a lithium battery. The electrolyte comprises a lithium salt, an organic solvent, and functional additives, wherein the functional additives include aluminum alkoxide compounds. A battery containing the additives is also provided. Based on the discovery that ethylene carbonate (EC) degrades battery thermal safety under high-temperature thermal abuse conditions, aluminum isopropoxide is innovatively introduced as a functional additive. This additive is stable at room temperature, but under high-temperature thermal abuse scenarios, it can act as a Lewis acid catalyst, specifically catalyzing the ring-opening polymerization reaction of EC in the electrolyte to generate polymer segments. Compared with existing technologies, the electrolyte provided by this invention effectively improves the high-temperature storage performance and thermal shock resistance of the battery without sacrificing its room-temperature electrochemical performance.

Symmetric Star Poly(Substituted Glycolide) Homopolymers and Their Surface Properties The invention include the synthesis, thin film formation, surface properties, and comprehensive analysis of star-shaped well-defined symmetric poly(substituted glycolide) (s-PSG) homopolymers, which are alternatives to polylactides and polyglycolides. Four-armed symmetric poly(L-diisopropyl glycolide) (4s-PLDIPG) and poly(L-diisobutyl glycolide) (4s-PLDIBG) prepared by ring opening polymerization (ROP) under melt conditions with tin (II) 2- ethylhexanoate catalyst and pentaerythritol initiator exhibited high conversions (92-98%) and desirable PDI values (1.23-1.49). The NMR data of all s-PSGs showed that the methylene peaks of pentaerythritol were shifted, proving that polymerization took place in all arms. The molecular weights (Mn NMR, Mw GPC, Mn GPC) of s-PSGs determined by NMR and GPC data were consistent with the theoretical values. By increasing the side chain length of s-PSG homopolymers, there was a consistent increase in the water contact angles and surface roughness values of the thin films, whereas the surface free energy diminished.

The invention discloses an alcohol-resistant cosmetic packaging shell material based on polylactic acid modification and a preparation method thereof, and belongs to the technical field of packaging material preparation. The polylactic acid modified alcohol-resistant cosmetic packaging shell material is used for solving the technical problem that in the prior art, the alcohol resistance and the mechanical property of a cosmetic packaging shell material need to be further improved. Comprising the following components in parts by weight: 65-85 parts of alcohol-resistant modified polylactic acid, 10-15 parts of polylactic acid modified sepiolite, 3-5 parts of a fluorosilicone epoxy compatilizer and 1-3 parts of an auxiliary material. Polylactic acid is used as a matrix, ring opening polymerization is initiated through 2-chloro-N-(2-hydroxyethyl)-acetamide, polyether amine is grafted, alcohol-resistant modified polylactic acid is prepared, sepiolite is acidified and grafted with polylactic acid to improve interfacial compatibility, a fluorosilicone epoxy compatilizer is prepared for synergistic modification, all the components are premixed and subjected to twin-screw melt extrusion, and the composite material is prepared. The cosmetic packaging shell material with alcohol resistance and mechanical property is prepared.

The invention relates to an in-situ polymerization cross-linked battery adhesive as well as a preparation method and application thereof, and belongs to the technical field of electrode materials. The technical problems that a traditional linear adhesive is low in mechanical strength, poor in high-temperature stability and prone to swelling in electrolyte, and an existing crosslinking technology is complex in process and incompatible with an existing production line are solved. The invention provides an adhesive. A polyamino compound and polyethylene glycol with multiple epoxy end groups are spontaneously subjected to a ring-opening polymerization reaction through amino groups and epoxy groups, and a three-dimensional cross-linked polyether-amine network structure is formed in situ. The method is simple in process and compatible with a conventional electrode drying process. A cross-linked network formed by the adhesive endows the electrode with excellent mechanical strength and stripping resistance, and active substances can be effectively inhibited from falling off; and meanwhile, the high thermal stability and the insolubility in electrolyte are realized, so that the cycle life and the safety of lithium ion, sodium ion and potassium ion batteries are remarkably prolonged, and the safety of the lithium ion, sodium ion and potassium ion batteries is remarkably improved.

The present invention relates to the technical field of fine chemical synthesis. Disclosed is a method for synthesizing bisphenol A polyether. In the synthesis method, bisphenol A is used as an initiator, and a composite catalyst consisting of a carbonate, an amine compound, and an organic phosphine is used to catalyze a ring-opening polymerization reaction of an alkylene oxide, thereby obtaining a bisphenol A polyether having a low hydroxyl value and a light color. The problems in the prior art that a product is prone to isomerization and decomposition under the action of a strong base catalyst, and that the color of the product darkens are effectively solved.

The invention discloses a method for accurately synthesizing epoxy polysiloxane with controllable epoxy content by efficiently catalyzing ring-opening polymerization of cyclosiloxane monomers by adopting an organic phosphazene base catalyst. A siloxane copolymer with controllable epoxy siloxane group content can be accurately synthesized at 10-50 DEG C. The invention also discloses a preparation method of the epoxy polysiloxane with controllable epoxy content. The polymer preparation method has the obvious advantages that the polymerization process is simple, the polymerization efficiency is high, the reaction temperature is mild, polysiloxane containing methyl, ethyl, phenyl and vinyl side groups can be prepared, and the polymer preparation method has very high practical application value.

The invention belongs to the technical field of epoxy resin curing agents, and provides a multi-element random copolymer latent epoxy resin curing agent and a preparation method thereof. The preparation method comprises the following steps: in a nitrogen atmosphere, mixing a hydroxyl-containing acrylate monomer, a vinyl-containing oxygen ring-containing monomer, a ring-opening monomer, an initiator and a solvent, and reacting to obtain a reaction solution; precipitating the reaction solution; the ring-opening monomer is a tertiary amine-containing acrylamide monomer or an imidazolyl-containing monomer. The ring-opening monomer can quickly initiate the ring-opening polymerization reaction of an epoxy group at high temperature, so that the curing rate is increased; the hydroxyl-containing acrylate monomer forms an intramolecular hydrogen bond network, so that the reaction activity at normal temperature is reduced, and the storage stability is improved; the vinyl-containing oxygen-ring-containing monomer enhances the intermolecular interaction with the epoxy resin, and improves the dispersibility and compatibility; through the collaborative design strategy of multiple functional groups, the optimal balance of the curing system among the storage stability, the compatibility and the reaction activity is realized.

The invention belongs to the technical field of cable preparation, and relates to a high-strength coal cutter optical fiber flexible cable and a preparation method thereof. The high-strength optical fiber flexible cable for the coal mining machine sequentially comprises an outer sheath, a middle coating layer, a shielding layer, an insulating layer and a cable core from outside to inside. The outer sheath is prepared from the following raw materials in parts by weight: 90 to 100 parts of modified polyurethane, 10 to 15 parts of polyvinyl chloride, 18 to 25 parts of modified filler, 0.3 to 0.5 part of antioxidant and 0.3 to 0.5 part of lubricant. The modified polyurethane is prepared by carrying out ring opening polymerization on cyclosiloxane to generate a hydroxyl-terminated polysiloxane monomer, and carrying out dehydration condensation polymerization on the hydroxyl-terminated polysiloxane monomer and a monomer containing multiple hydrogen bonds. The modified filler is prepared by the following steps: preparing nickel-coated zirconium oxide particles by a heterogeneous precipitation-thermal reduction method, and then preparing a sol-gel silicon dioxide coating layer. The prepared high-strength coal cutter optical fiber flexible cable has excellent wear resistance and toughness.

The present invention relates to the use of alkali metal phenolic compounds of formula (I) or (II) as catalysts in the ring-opening polymerization of heterocycles such as cyclic esters, ethers and carbonates for the industrial production of biodegradable polymers. The present invention also relates to polymerization processes using these compounds.

The invention discloses a polyether network gel electrolyte and a preparation method, and relates to the technical field of lithium batteries. The polyether network gel electrolyte comprises a high-molecular compound, a Z-coated H composite flame retardant for a polymerization supporting layer and a modified precursor. Two monomers are subjected to ring opening polymerization under the action of a cross-linking agent to form a cross-linked polyether network framework, then the cross-linked polyether network framework is compounded with phosphonitrilic chloride trimer to obtain a Z-at-H composite flame retardant for a precursor, then the Z-at-H composite flame retardant for the precursor and a basic raw material are prepared into a modified precursor, and the modified precursor is prepared into the flame retardant. And finally, carrying out electrostatic spinning on the modified precursor, the polymerization supporting layer and a high-molecular compound by using a Z-H composite flame retardant. The polyether network gel electrolyte prepared by the invention not only can improve the ionic conductivity of the electrolyte, but also has good cycle stability and flame retardant property.

The invention belongs to the field of functional polymers, and particularly relates to a high-toughness, repairable and recoverable epoxy vitrimer and a preparation method thereof.The epoxy vitrimer is obtained through a ring-opening polymerization reaction of dithiodiphenyl diglycidyl ether, bisphenol A diglycidyl ether and isocyanuric acid tris [2-(3-mercaptopropionyloxy) ethyl ester] at the temperature ranging from the room temperature to 100 DEG C. The epoxy vitrimer has the advantages that the epoxy vitrimer is high in toughness, can be repaired and recoverable, and can be recycled; after being completely cured, the high-toughness characteristic is shown, the tensile strength is not lower than 40 MPa, and the elongation at break is not lower than 140%. Meanwhile, the epoxy vitrimer can realize the characteristics of being repairable and recoverable at a high temperature.

The invention relates to a polymer preparation technology, and discloses a functionalized lactam oligomer, a preparation method and application thereof, a functional polymer and a preparation method thereof. The functionalized lactam oligomer contains a lactam oligomerization unit and a functional unit bonded with the lactam oligomerization unit, and the melting point of the functionalized lactam oligomer is 180-220 DEG C; the preparation method comprises the following steps: reacting a functional agent with lactam under a ring-opening polymerization reaction condition; the functional agent has a functional group capable of bonding with an oligomeric unit of the lactam. The functional polymer contains the functional lactam oligomer, and the functional lactam oligomer is bonded with the chain segment of the polymer. According to the functionalized lactam oligomer, functional groups can be efficiently introduced into polymer chain segments, preparation of the functionalized polymer is achieved, particularly, the dyeing function is uniform in effect and high in stability, the excellent performance of polymer products can be kept, the process is simple, and the cost is low.