68 results about "Ether oxygen" patented technology

The present invention provides an ultrathin polyethylene oxide-based carbon capture film, and a preparation method therefor and the use thereof. The ultrathin polyethylene oxide-based carbon capture film is of a three-layer composite structure, successively comprising a polyethylene oxide-based separation layer having a strong CO2 affinity, a modified interface modification layer and a support layer from top to bottom. The separation layer is prepared by carrying out cross-linking reaction of PEO and a silicone rubber monomer, and thus contains a large number of ether oxygen groups preferentially adsorbing CO2, and, by means of the introduction of a silicone rubber chain segment, overcomes the structural defects of high cohesive energy and low permeability of pure PEO films, thus achieving high gas molecule permeability. Aiming at the problem of poor compatibility between the interface modification layer and the separation layer, the surface properties of the interface modification layer are improved by utilizing a simple and controllable UV / O3 treatment method which is easy to scale up, thus achieving uniform and defect-free coating of the ultrathin separation layer. The present invention involves a simple preparation process, can easily realize scale-up preparation, and achieve excellent carbon capture performance.

The invention relates to the technical field of gas separation membrane materials, and discloses a preparation method of a composite membrane, the composite membrane and application of the composite membrane in the field of carbon dioxide separation. The method comprises the following steps: S1, soaking a base membrane in an acyl chloride solution; s2, a product obtained in the step S1 is soaked in a solution containing a diamine monomer and an acid absorbent for interfacial polymerization reaction, the diamine monomer contains ether oxygen chain segments, and the number of ether oxygen bonds is larger than or equal to 2; and S3, drying the product obtained in the step S2. The method comprises the following steps: soaking a base membrane in an acyl chloride solution to uniformly spread acyl chloride on the surface of the base membrane, and then soaking the base membrane in a solution of a diamine monomer rich in ether-oxygen chain segments, so that the acyl chloride and the diamine monomer rich in ether-oxygen chain segments are subjected to interfacial polymerization reaction to obtain the ether-oxygen chain segment-rich polyamide composite membrane with excellent permeability and separation performance.

The invention discloses a low-concentration ether electrolyte adaptive to a high-voltage high-nickel ternary lithium ion battery, a preparation method of the low-concentration ether electrolyte and the lithium ion battery, and relates to the technical field of batteries. The ether electrolyte comprises a solvent and a solute; the solvent comprises an ether solvent, and is specifically at least one of 4-cyano tetrahydropyran, 2-(tetrahydro-2H-pyran-4-yl) acetonitrile, 2-methoxyacetonitrile, 2-ethyoxyl acetonitrile, 3-methoxypropionitrile, 3-ethyoxyl propionitrile, 3-butoxyl propionitrile, ethylene glycol bis (propionitrile) ether and 3-{2-[2-(2-cyano ethyoxyl) ethyoxyl] ethyoxyl} propionitrile. The ether solvent contains cyano groups, the strong electronegativity of the cyano groups enables the cyano groups to be coordinated with transition metal ions in the ternary material, and the cyano groups are preferentially adsorbed at the interface of the positive electrode material, so that the arrangement of solvent molecules at the interface has directivity, the proportion of ether oxygen bonds and carbon hydrogen atoms in double electric layers is reduced, and the performance of the positive electrode material is improved. And the sites which are easy to generate dehydrogenation reaction in the molecules are far away from the high-voltage positive electrode interface which is easy to generate oxidation reaction.

The present invention belongs to the field of polymer materials and provides a method for the high-value recycling of waste nylon. Specifically, nylon recovered from products such as waste fishing nets, textiles, oil pipes, and oil cups is depolymerized by small molecule acids containing ether oxygen bond structures to obtain carboxyl-terminated oligomeric nylon chain segments, which are then further reacted with polyether components to prepare polyetheramide elastomers. The present invention not only broadens the recycling and treatment ideas for waste nylon, reduces environmental pollution caused by nylon waste, but also transforms waste nylon into high-value polyetheramide elastomers. Compared with the current nylon recycling routes and polyetheramide synthesis routes, it has the advantages of simple process flow and equipment, short reaction cycle, and low energy consumption, and the obtained products have excellent comprehensive properties.

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a polymer material for producing hydrogen peroxide through photocatalysis and a preparation method of the polymer material. The preparation method of the polymer material comprises the following steps: carrying out polymerization reaction on a pyridine aldehyde compound and a hydrazide compound with a structure as shown in a formula (1) in the presence of a catalyst and an organic solvent to obtain the polymer material, the pyridine aldehyde compound is selected from 2, 2 '-bipyridine-5, 5'-dicarboxaldehyde and / or 3, 3 '-bipyridine-6, 6'-dicarboxaldehyde. The key point of the invention is that the polymer material is obtained by carrying out polymerization reaction on the pyridine aldehyde compound and the hydrazide compound which have specific structures, and the polymer material has a specific bipyridine structure and a side chain contains an ether oxygen bond, so that the light absorption efficiency of the polymer material can be improved; the polymer material can generate more photon-generated carriers with photocatalytic H2O2 production activity under illumination excitation, so that the yield of photocatalytic H2O2 production can be remarkably improved. # imgabs0 #

The present application provides an electrolyte, a battery and a power utilization device, the electrolyte comprises a solvent and an electrolyte salt dissolved in the solvent, the solvent comprises a first solvent, the first solvent comprises an ether solvent, and in the molecular structure of the ether solvent, the molecular weight of the ether solvent is greater than that of the electrolyte salt. And the alpha-carbon atoms E directly connected with the oxygen atoms on the ether oxygen bond functional groups do not have hydrogen atoms directly connected with the alpha-carbon atoms.

The present invention relates to the technical field of adhesive materials, and in particular to a reusable and high shear strength electrical adhesive tape and a preparation method thereof, which is prepared by using acrylic acid esters or olefin monomers, esters containing methoxy polyethylene glycol, acrylic acid, salts, functional monomers, organic solvents, tackifying resins, etc. In the electrical adhesive tape of the present invention, most of the electrolyte is chemically bonded to the main adhesive molecular chain, and part of the electrolyte is dissociated and complexed by the ether oxygen bond strength in the methoxy polyethylene glycol, rather than the simple physical mixing in the prior art, so that a large amount of electrolyte precipitation is effectively avoided when the electrolyte is energized, and the tape can be reused.

The application provides a fluorinated ether solvent and an electrolyte applied to energy storage batteries, especially lithium metal batteries, and the fluorinated ether solvent has a structure shown in formula I. By introducing at least one fluorine atom at both ends of an ether molecular chain, the fluorinated ether molecule has excellent salt solubility, the introduction of the fluorine atom can effectively reduce the electron cloud density of ether oxygen to improve the oxidation stability of the ether molecule, and excellent cycle stability of the high-voltage lithium metal battery is achieved; meanwhile, the locally strong polar fluorinated end group can interact with the cation of the salt to improve the ionic conductivity of the electrolyte, and the rapid charge-discharge performance of the high-voltage lithium metal battery is improved.

The invention discloses a high-ionic-conductivity polymer electrolyte with strong sodium metal compatibility and a preparation method thereof, and the high-ionic-conductivity polymer electrolyte comprises a three-dimensional cross-linked polymer network formed by free radical polymerization cross-linking of an ether oxygen-containing cross-linking agent or an ether oxygen-containing polymerizable monomer; and, a deep eutectic solvent dispersed in the polymer network; wherein the deep eutectic solvent is formed by at least one sodium salt and at least one hydrogen bond donor and / or hydrogen bond acceptor according to a predetermined molar ratio, and the mass fraction of the deep eutectic solvent in the electrolyte is 50-80 wt%. And high room-temperature sodium ion conductivity is realized while the solid-state / quasi-solid-state safety is maintained. Compared with the traditional PEO-based solid sodium electrolyte, the total ionic conductivity greater than or equal to 2 mS / cm can be realized at room temperature, and is obviously superior to the typical 10 <-5 >-10 <-4 > S.cm <-1 > level; meanwhile, the mechanical strength and the shape retention which are obviously higher than those of a pure gel system are still kept, so that the conductivity and the safety are both considered.

The application relates to the technical field of gas separation membrane materials, and discloses a preparation method of a composite membrane, the composite membrane and application of the composite membrane in the field of carbon dioxide separation. The method comprises the following steps: S1, soaking a base film in an acyl chloride solution; S2, soaking the product obtained in step S1 in a solution containing a diamine monomer and an acid absorbent to perform an interfacial polymerization reaction, wherein the diamine monomer contains an ether oxygen chain segment, and the number of ether oxygen bonds is greater than or equal to 2; and S3, drying the product obtained in step S2. The method is characterized in that the base film is soaked in the acyl chloride solution to uniformly spread the acyl chloride on the surface of the base film, and then the base film is soaked in the solution rich in the ether oxygen chain segment diamine monomer, so that the acyl chloride and the ether oxygen chain segment rich diamine monomer utilize the interfacial polymerization reaction to obtain the ether oxygen chain segment rich polyamide composite membrane which is excellent in permeation performance and separation performance.

Provided is a fluorine-containing ether compound represented by Formula (1). R1—CH2—R2—CH2—R3 (1) R2 represents a perfluoropolyether chain. R1 and R3 represent an end group having one to four polar groups and 1 to 50 carbon atoms. At least one of R1 or R3 represents an end group represented by Formula (2). —O—X—CH(OH)—CH2OH (2) X represents a divalent organic group having 2 to 30 carbon atoms, which may have at least one of one or two polar groups or one to three ether oxygen atoms. X has at least one carbon atom which is not bonded to any of the polar groups and the ether oxygen atoms.

The preparation method comprises the following steps: S1, preparation of a precursor solution: adding a segmented copolymer, a supramolecular monomer, an inorganic filler, a lithium salt system and a cross-linking agent into a DMF / acetone mixed solvent in proportion, and stirring for dissolving to obtain the precursor solution with the solution concentration of 5-15 wt%; s2, gradient volatilization film formation: uniformly coating the precursor solution on the surface of a base material, regulating and controlling the volatilization rate in three sections at the interval of 30-60 DEG C, and forming an electrolyte film with a vertical orientation nano-channel structure at the relative humidity of 30-70%; s3, hot-pressing cross-linking treatment: placing the electrolyte membrane subjected to gradient volatilization molding in a hot press, maintaining for a period of time under the hot-pressing conditions of 100-150 DEG C and 2-10 MPa, carrying out ring-opening cross-linking reaction on anhydride groups in a cross-linking agent and hydroxyl groups and ether oxygen groups in a block copolymer matrix, and controlling the cross-linking density to be 0.5-3 mol / m < 3 >, so as to obtain the electrolyte membrane. And finally obtaining the polymer solid electrolyte membrane with the multi-scale synergistic structure.

A molding compound contains polyether block amide (PEBA) based on a subunit 1 made of at least one linear aliphatic diamine having 5 to 15 C atoms and at least one linear aliphatic or aromatic dicarboxylic acid having 6 to 16 C atoms. The PEBA also contains a subunit 2 made of at least one polyether diol having at least 3 C atoms per ether oxygen and primary OH groups at the chain ends. The sum of the C atoms of diamine and dicarboxylic acid is odd and is 19 or 21, and the number-average molar mass of the subunit 2 is 200 to 900 g / mol. A molded object can be created from the molding compound, which can be a molded part, a film, a bristle, a fiber, or a foam.

The application discloses a gel polymer electrolyte and a preparation method and application thereof. The gel polymer electrolyte comprises monomers, an initiator, a lithium salt and an organic solvent. The monomers are provided with ether oxygen functional groups and carbonyl functional groups capable of conducting Li+. The initiator is selected from one of tin triflate and stannous octoate. The total mass ratio of the initiator and the monomers is 0.1-10:90-99. The mass ratio of the organic solvent and the lithium salt is 2-5:1. The application can realize the stability of the material to lithium metal without using a free radical polymerization mode represented by azobisisobutyronitrile, and can solve the problems of chemical reactions caused by initiator products and side reactions of residual active monomers by adjusting the adding proportion among the monomers, the initiator, the lithium salt and the organic solvent.

This invention provides an inorganic-organic composite solid electrolyte membrane and its preparation method, belonging to the field of solid electrolyte membrane technology. The invention uses anisole and tetrahydrofuran as a mixed solvent to dissolve methyl-terminated PEO. Tetrahydrofuran weakens the interaction between the ether oxygen atoms on the PEO chain and anisole, promoting the dispersion of PEO in the mixed solvent and facilitating the formation of a homogeneous coating slurry. Meanwhile, methyl-terminated polyethylene oxide not only improves the loss of ionic conductivity after the sulfide solid electrolyte is composited with a non-ionic binder, but its methyl termination also inhibits the degradation effect of polyethylene oxide on the sulfide solid electrolyte, better preserving the high-performance characteristics of the sulfide. Furthermore, the addition of Li3PO4 increases the lithium ion transport rate in polyethylene oxide, thereby improving the ionic conductivity of the composite solid electrolyte membrane.

The invention discloses an organic-inorganic hybrid composite diaphragm and a preparation method thereof, and belongs to the field of battery diaphragms. The composite diaphragm comprises a base membrane and an organic-inorganic hybrid coating, the organic-inorganic hybrid coatings are coated on the two sides of the base membrane; the organic-inorganic hybrid coating comprises the following raw materials in parts by mass: 20-30 parts of modified branched polymethyl methacrylate, 10-20 parts of inorganic particles, 3-5 parts of a water-based adhesive, 1-2 parts of a dispersing agent and 40-65 parts of a solvent; and the molecular chain of the modified branched polymethyl methacrylate contains ether oxygen bonds. Modified branched polymethyl methacrylate can effectively prevent inorganic particles from falling off in the circulation process, a composite system is formed, the porosity of the diaphragm is improved, ether oxygen bonds are combined, the ion transmission efficiency is remarkably enhanced, and the performance of the diaphragm is improved by optimizing a physical channel, enhancing interface wettability and dynamically regulating and controlling an ion transmission path. And the rate capability and the cycling stability of the battery when the diaphragm is applied to the lithium ion battery are obviously improved.

The invention belongs to the technical field of gas membrane separation, and discloses a method for customizing nano channels by grafting ether oxygen groups in COFs membrane pores. Phenolic hydroxyl groups of COFs and brominated OE are subjected to a Williamson cross-linking reaction, ether oxygen chains of different lengths and types are introduced to accurately regulate and control the pore size of the COFs membrane, the ether oxygen chains of different lengths occupy the space in pores, a steric effect is formed, large CO2 molecules are prevented from passing through the membrane, and small H2 is allowed to pass through. Meanwhile, the existence of ether bonds greatly enhances the adsorption of CO2, inhibits the diffusion of CO2, realizes the coordinated regulation and control of the steric hindrance effect and dynamic screening in membrane pores, and the introduction of flexible ether oxygen groups does not significantly reduce the permeability of hydrogen under the condition of high-density grafting, thereby realizing the efficient separation of H2 / CO2. The method is simple in preparation process, stable in structure and suitable for most phenolic hydroxyl COFs.

The invention provides a hydroxyl aryl uracil compound and application thereof, the structure of the hydroxyl aryl uracil compound is as shown in formula (I), in the formula (I), R1 and R2 are respectively and independently selected from C1-C4 alkyl, C1-C4 halogenated alkyl and the like; x and Y are respectively and independently selected from hydrogen atoms, halogen atoms and the like; z is selected from oxygen atoms or sulfur atoms; a is selected from-CH or a nitrogen atom; l is selected from a substituted or unsubstituted first group, and the first group is selected from C3-C8 cycloalkyl,-Ra-Rb-,-Rb-Rc-,-Ra-Rb-Rc-or a C2-C20 carbon chain containing 1 to 6 ether oxygen atoms. The hydroxyl aryl uracil compound has the advantages of being high in selectivity, wide in weeding spectrum, low in production cost and the like, weeds are not prone to generating resistance, and particularly has a good control effect on gramineous worst weeds such as goosegrass, barnyard grass and moleplant seeds.

The invention belongs to the technical field of magnetic microspheres, and particularly relates to p-toluenesulfonylated magnetic microspheres and a preparation method thereof. The preparation method comprises the following steps: S1, forming ferroferric oxide magnetic particles from a ferric iron solution at a high temperature; s2, preparing magnetic microspheres after swelling; s3, the magnetic microspheres obtained after swelling in the step S2 are wrapped with 3-glycidyl ether oxypropyl trimethoxy silane, and the wrapped magnetic microspheres are obtained; s4, carrying out ring opening on the wrapped magnetic microspheres obtained in the step S3 under an alkaline condition, and carrying out a reaction with tris (hydroxymethyl) aminomethane to obtain hydroxylated magnetic microspheres; and S5, carrying out a reaction on the hydroxylated magnetic microspheres and paratoluensulfonyl chloride to obtain the paratoluensulfonylated magnetic microspheres. The paratoluensulfonylation magnetic spheres prepared by the method are uniform in particle size and good in magnetic responsiveness, and can meet clinical requirements.

The invention discloses a copper alloy passivation pretreatment pickling activator. The copper alloy passivation pretreatment pickling activator comprises the following components in percentage by weight: 61.0%-63.8% of water, 10.0%-15.0% of citric acid, 10.0%-12% of sulfamic acid, 1.0%-2.0% of tween-20, 2.0%-3.0% of hydrogenated castor oil polyoxyethylene ether-20, 5.0% of glycerin, 0.2% of phenoxyethanol and 3.0%-6.0% of polyethylene glycol-600. The invention relates to mercaptan water system protection. In the formula, a nonionic surfactant with the hydrophilic-lipophilic balance value of 13 or above is selected, the acting force between hydroxyl oxygen or ether oxygen and copper atoms on the surface of the copper alloy is mainly hydrogen bonds, the hydrophilicity is higher than the lipophilicity, a layer of temporary anti-oxidation protective film can be formed on the copper alloy, the protective film can be replaced in a passivation solution, and the anti-oxidation effect is good. By the adoption of the passivation solution, the protective film on the surface can be removed through acid pickling to prepare for next passivation, and meanwhile a temporary protective film capable of being replaced by the passivation solution in the next step can be formed for copper.

The invention discloses a preparation method of a reverse osmosis membrane with high desalination rate and high selectivity, a nonionic surfactant polyethylene glycol monododecyl ether capable of reacting with trimesoyl chloride is introduced into an organic phase, a newly generated monomer has the performance of a surfactant, and a monomolecular layer aggregate can be formed at a two-phase interface; an acyl chloride group in trimesoyl chloride and an ether oxygen group in the new monomer are polar groups, and the amine monomer is promoted to be gathered at a phase interface under the action of high dipole moment; meanwhile, a non-ionic surfactant in the organic phase reacts with trimesoyl chloride to generate a new monomer, so that the reaction of trimesoyl chloride and an amine monomer can be promoted, and the new monomer can react with the amine monomer to fill a low selection region in the separation layer. The preparation method provided by the invention is simple and easy to amplify, does not change the existing reverse osmosis preparation process, and is easy to directly produce on the existing production line.

The present invention discloses a heavy ion microporous membrane for a self-regulated atmosphere fresh-keeping box and a preparation method thereof, relating to the technical field of self-regulated atmosphere membranes. This application uses a polyethylene microporous membrane as a substrate. First, a polydopamine adhesion layer is formed on the membrane surface through a dopamine self-polymerization-crosslinking reaction, thereby improving the hydrophilicity of the membrane surface and preventing pore clogging by nanomaterials. Next, amino polyether is used to form a covalent bond graft modification with polydopamine, and a block polyether-modified silicone oil containing a tertiary amine and an ether oxygen bond is introduced to improve the membrane's selectivity for carbon dioxide. Finally, a nano-inorganic substance is used to form an infiltration layer to improve the membrane surface wettability and avoid inorganic mineral clogging and agglomeration problems. This layered structure not only does not damage the membrane flux and strength, but also improves the overall mechanical strength of the heavy ion microporous membrane.

The invention discloses a reverse catalyst, which is characterized in that a nano metal oxide MO is used as a loading phase and is uniformly loaded on a carrier metal M'to form a nano oxide / metal reverse interface structure, which is recorded as MOx / M ', and x represents the molar ratio of M' to M; wherein the nano metal oxide MO is one of molybdenum oxide, rhenium oxide, tin oxide, yttrium oxide or lanthanide metal oxide, and the carrier metal M'is one of ruthenium, cobalt, platinum, nickel, palladium, copper or silver. The catalyst provided by the invention can promote cracking of C-O bonds in biomass derivative molecules by utilizing strong interface electron interaction between MO and M'and enhancing ether oxygen adsorption on electron-rich interface sites near oxygen vacancies, so as to obtain high-selectivity polyol. The polyhydric alcohol produced by the method is a bio-based polymer monomer, so that the application range of bio-based derivatives is expanded, and the comprehensive utilization of straws is further promoted.

The application discloses an easy-to-clean thermoplastic polyurethane pressure-sensitive adhesive and a preparation method thereof. The easy-to-clean thermoplastic polyurethane pressure-sensitive adhesive comprises the following raw materials in parts by mass: A. polyethylene glycol: 100 parts; B. polyisocyanate: 26-40 parts; C. chain extender: 20-36 parts; D. retarder: 1-2 parts; E. catalyst: 0.1-0.5 parts; F. antioxidant: 0.1-0.5 parts; G. hydrolysis stabilizer: 0.1-0.5 parts; and H. flame retardant: 1-5 parts. The application is prepared from polyethylene glycol, diisocyanate, chain extender and catalyst and the like, and the introduction of a suitable main chain structure and chain extender in the preparation process of the polyurethane pressure-sensitive adhesive can effectively improve the hydrophilicity of the polyurethane pressure-sensitive adhesive. The ether oxygen bond of the polyethylene glycol is easy to bend and fold, and water molecules are easy to form hydrogen bonds with the ether oxygen bond, thereby showing good hydrophilicity. The pressure-sensitive adhesive is particularly suitable for the processing technology of optical elements such as lenses and spectacle lenses.

The fluorine-containing ether compound is a fluorine-containing ether compound represented by the following formula. R < 1 >-CH < 2 >-R < 2 >-(CH < 2 >-OCH < 2 >-CR3R < 4 >-CH < 2 > O-CH < 2 >-R < 2 >) z-CH < 2 >-R < 5 > (z is 1 or 2). And R2 is a perfluoropolyether chain. Each of R1 and R5 represents a terminal group having 1 to 50 carbon atoms and having at least one polar group; r3 and R4 may be the same as or different from each other, each of R3 and R4 is an organic group having 1-5 carbon atoms and bonded to a tetra-substituted carbon atom, and each of R3 and R4 does not include a secondary hydroxyl group and a tertiary hydroxyl group but includes one primary hydroxyl group. The organic group may include an ether oxygen atom between carbon atoms, and the terminal bound to the tetra-substituted carbon atom may be an ether oxygen atom).

An embodiment of this application provides a leveling agent, which is specifically a polypyridine compound, where the polypyridine compound includes a structural unit shown in Formula (I) or a protonated product of the structural unit shown in Formula (I): In Formula (I), R1 and R2 are independently any one of the following: substituted or unsubstituted alkylene, substituted or unsubstituted arylene, substituted or unsubstituted arylene alkyl, substituted or unsubstituted alkylene aryl, alkylene containing an ether oxygen atom, ester, and / or imide, arylene containing an ether oxygen atom, ester, and / or imide, arylene alkyl containing an ether oxygen atom, ester, and / or imide, and alkylene aryl containing an ether oxygen atom, ester, and / or imide; and R3 is any one of groups such as a single bond, substituted or unsubstituted alkylene, substituted or unsubstituted arylene, substituted or unsubstituted arylene alkyl, and substituted or unsubstituted alkylene aryl. The leveling agent facilitates implementation of defect-free high-flatness filling. Embodiments of this application further provide a preparation method for the leveling agent and an application thereof.

The invention discloses a polyvinylidene fluoride hydrophilic microfiltration membrane, which comprises a membrane casting solution, and the membrane casting solution is prepared from the following raw material components: 5 to 20 weight percent of polyvinylidene fluoride (PVDF) powder, 0.1 to 1.0 weight percent of hydrophilic pore-foaming agent, 0.1 to 0.5 weight percent of water-soluble additive, 5 to 20 weight percent of oxygen-containing solvent and the balance of polar solvent, the water-soluble additive is one or more than two of polyethyleneimine (PEI), sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (LAS) and tannic acid (TA); the oxygen-containing solvent is an alcohol ether oxygen-containing solvent and comprises but is not limited to one or more than two of ethylene glycol monomethyl ether (EGME), ethylene glycol monobutyl ether (BCS), diacetone alcohol (DAA), dipropylene glycol methyl ether (DPM) and propylene glycol butyl ether (PNB). By adding the water-soluble additive and the oxygen-containing solvent into the PVDF membrane casting solution, dissolution and dispersion of solute molecules in the membrane casting solution are promoted, and interaction between hydrophilic components and a PVDF substrate is enhanced, so that the membrane forming leveling property and the hydrophilic effect stability of the PVDF hydrophilic microfiltration membrane are improved.

An embodiment of the present disclosure provides a leveling agent, which is specifically a polypyridine compound, where the polypyridine compound includes a structural unit shown in Formula (I) or a protonated product of the structural unit shown in Formula (I):In Formula (I), R1 and R2 are independently any one of the following: substituted or unsubstituted alkylene, substituted or unsubstituted arylene, substituted or unsubstituted arylene alkyl, substituted or unsubstituted alkylene aryl, alkylene containing an ether oxygen atom, ester, and / or imide, arylene containing an ether oxygen atom, ester, and / or imide, arylene alkyl containing an ether oxygen atom, ester, and / or imide, and alkylene aryl containing an ether oxygen atom, ester, and / or imide; and R3 is any one of groups such as a single bond, substituted or unsubstituted alkylene, substituted or unsubstituted arylene, substituted or unsubstituted arylene alkyl, and substituted or unsubstituted alkylene aryl.

The invention provides a copolyimide film as well as a preparation method and application thereof, and belongs to the technical field of polymeric membrane separation. The copolyimide film has a structure as shown in a formula I or a formula II: # imgabs 0 # formula I and # imgabs 1 # formula II, both the formula I and the formula II comprise a part which has a polymerization degree of m and contains an ether oxygen group-loaded dianhydride monomer and a part which has a polymerization degree of n and contains an ether oxygen group-unloaded dianhydride monomer. The obtained copolyimide film is mainly used for gas separation. According to the monomers containing ether oxygen groups among biphenyl units, by adjusting the proper proportion of the part containing the dianhydride monomer loaded with the ether oxygen groups to the part containing the dianhydride monomer unloaded with the ether oxygen groups, the rotary motion among benzene rings is limited, the rigidity and free volume of a polymer chain are improved, and the polymer has higher permeability; and meanwhile, selectivity can be balanced.

The invention relates to the technical field of rechargeable magnesium batteries, and particularly provides a high-safety rechargeable magnesium battery diaphragm for inhibiting magnesium dendrites as well as a preparation method and application of the high-safety rechargeable magnesium battery diaphragm. A high-safety rechargeable magnesium battery diaphragm capable of inhibiting magnesium dendrites is prepared from a first component and a second component through electrostatic spinning, the first component is one or more of nylon-based derivatives, and the second component is one or more of nylon-based derivatives. And the second component is one or more of polysaccharide or polyester derivatives containing polar group carboxyl, sulfonic group, hydroxyl, ether oxygen group or ester group. Through an electrostatic spinning technology, the nanofiber composite battery diaphragm with a spider network structure is obtained, and the nanofiber composite battery diaphragm has excellent electrolyte wettability, tensile strength and thermal stability. According to the invention, cellulose or polyester derivatives rich in polar functional groups are introduced on the basis of nylon derivatives with good chemical stability, and the solvation structure of the electrolyte is regulated and controlled through the dipole-dipole interaction of diaphragm polymer molecules and the electrolyte solvent, so that the desolvation of magnesium ions is accelerated; and thus, the magnesium ion deposition behavior is improved to inhibit the growth of magnesium dendrites, and the cycling stability and safety of the battery are greatly improved.