545 results about "Polymer network" patented technology

The invention discloses a multilayer composite solid electrolyte membrane, a preparation method and a prepared solid-state battery, the multilayer composite solid electrolyte membrane sequentially comprises a three-dimensional polymer networked solid electrolyte, a LiPON layer and a polydopamine layer, the thickness of the three-dimensional polymer networked solid electrolyte is 20-40 [mu] m, and the thickness of the polydopamine layer is less than 100 nm. By adopting the synergistic effect of the silane coupling agent modified LLZO and the degraded chitosan, a better ion transmission coordination effect can be provided, and the efficiency of an ion channel is improved. The dendritic crystal inhibition efficiency is improved, obvious cracks are avoided after 1000 times of circulation, the composite material is applied to a solid-state battery, the cycle life of the battery is prolonged, and the capacity retention rate is 95% after 1000 times of circulation. The mechanical toughness of the solid electrolyte is improved, and the elongation at break can reach 130%. A water-phase solvent is used in the whole preparation process, use of an organic solvent is avoided, energy consumption is reduced by 40%, no VOC is discharged in the whole process, and the method is green, safe and environmentally friendly.

The invention discloses a preparation method and application of a membrane separation material based on external field enhanced water isotope separation. The preparation method comprises the following steps: firstly, pre-enriching a precursor component containing a polymerizable monomer, a cross-linking agent and a photoinitiator in a confinement pore channel of a nano-porous carrier through an impregnation-encapsulation strategy; and then, through in-situ photo-initiation polymerization, a covalent cross-linked functional polymer network is constructed in the pore channel, and stable packaging of the polymer is realized. In the water isotope separation period, external field conditions are regulated and controlled, the molecular conformation of a polymer chain is accurately controlled, and the separation performance is optimized. According to the invention, by virtue of an external field strengthening technology, the intramolecular / intermolecular interaction is destroyed, and the macromolecular chain is converted from contraction to stretching, so that more functional sites are exposed, and the water isotope separation material designed by the invention has a huge practical application prospect.

The invention relates to a bionic strong acid-resistant nanofiltration membrane and a preparation method thereof, and the bionic strong acid-resistant nanofiltration membrane comprises a porous support layer and an active separation layer formed on the surface of the porous support layer, the active separation layer is a polymer network layer formed by carrying out interfacial polymerization reaction on a water-phase solution containing polyamine and an oil-phase solution containing polyacyl chloride on the surface of the porous support layer. The water-phase solution and / or the oil-phase solution also contains a bionic amphiphilic phosphate compound, the bionic amphiphilic phosphate compound participates in interfacial polymerization reaction through an active functional group in a molecular structure of the bionic amphiphilic phosphate compound, and the phosphate structure of the bionic amphiphilic phosphate compound is covalently connected into a skeleton of the polymer network layer. The preparation method has the beneficial effects that the bionic amphiphilic phosphate compound with a hydrophilic phosphate head, a hydrophobic alkyl tail and a reaction site is synthesized, so that the bionic amphiphilic phosphate compound is spontaneously and orderly arranged on a water / oil interface and participates in interfacial polymerization, the film forming uniformity is improved, the pore size distribution is narrowed, and the intelligent response characteristic is given to the film.

The invention provides a self-healing silicon-carbon composite negative electrode material and a preparation method and application thereof. The self-healing silicon-carbon composite negative electrode material comprises a core material formed by silicon-carbon composite particles and a shell layer formed by a self-healing solid electrolyte coating layer, the self-healing solid electrolyte coating layer is a polymer network containing dynamic covalent bonds, and lithium salt is doped in the polymer network. According to the invention, through reversible fracture and recombination of dynamic covalent bonds, microcracks generated by volume expansion of silicon are automatically repaired in situ.

The invention discloses a DA bond polymer with antibacterial and self-repairing functions for a wood surface as well as a preparation method and a use method of the DA bond polymer. Chitosan serves as a wall material, cinnamon essential oil serves as a core material, the cinnamon essential oil and chitosan antibacterial microcapsules are prepared through emulsification, crosslinking and spray drying, and essential oil controlled release is achieved. Then bisphenol A diglycidyl ether DGEBA and furfuryl alcohol FA are used as raw materials, furyl functional epoxy resin FER is prepared under the catalysis of triethylamine TEA, bismaleimide BMI is added, and a DA bond self-repairing polymer is prepared through a DA reaction; and adding 4, 4-diaminodiphenylmethane DDM into the system, reacting with redundant DGEBA to generate a cross-linked polymer network, and adding the microcapsules into a DA bond semi-interpenetrating self-repairing network solution to obtain the DA bond polymer. A thin film formed by brushing and curing wood has antibacterial and self-repairing functions, scratches and microcracks on the surface of the wood can be repaired, and microbial erosion is inhibited.

The invention discloses a gas separation membrane and a preparation method thereof, and belongs to the technical field of gas separation membranes. The gas separation membrane comprises a separation layer comprising a network and PTI nanosheets dispersed in the network, the network comprising at least one of a biopolymer network and a chemical polymer network; selectively, the device further comprises a supporting layer which is arranged below the separation layer and is combined with the separation layer. The preparation method of the gas separation membrane comprises the following step A or step B: step A: enabling raw materials of PTI nanosheets and networks to form a membrane on the surface of polymer hydrogel to obtain the gas separation membrane; and step B, enabling the PTI nanosheet and the network raw material to form a membrane on the surface of the material of the support layer to obtain the gas separation membrane. The gas separation membrane provided by the invention is an N2 preferential permeation membrane, and has relatively high N2 permeation rate and relatively high N2 / CO2 selectivity.

The invention relates to the technical field of adhesive tapes, in particular to a convex ball-mounting wafer thinning adhesive tape, a preparation method thereof and a wafer thinning machine, the thinning adhesive tape comprises a base material film, a viscosity-reducing adhesive layer and a release film; the preparation method comprises the following steps: preparing a first polymer network; preparing a second polymer network; the adhesive composition is obtained; forming a liquid film; covering the base material film on a liquid film; covering a release film on the upper surface of the fixed module in the wafer thinning machine; in a wafer thinning machine, the wafer with the base material film is installed on a release film, and heating treatment is carried out on the laminated wafer so as to directly form a solidified thinning adhesive tape on the wafer; by constructing a thermal / optical dual-curing interpenetrating polymer network with a dual visbreaking mechanism and combining with a special preparation method of the thinning adhesive tape in a thinning machine, the probability that a convex ball-mounting wafer generates microcracks or warps in a specific area when the adhesive tape is used for thinning operation is reduced.

The invention provides a high-thermal-conductivity and high-adhesion thermal interface material and a preparation method thereof, and belongs to the technical field of thermal interface materials. The thermal interface material is prepared by in-situ cross-linking reaction of the following components: a polymer matrix comprising a polymer containing active functional groups and a cross-linking agent; the heat-conducting filler accounts for more than 90wt% of the total weight of the thermal interface material; the low-melting-point organic medium accounts for 0.1-5wt.% of the total weight of the thermal interface material, and the melting point of the low-melting-point organic medium is lower than the crosslinking curing temperature of the polymer matrix; wherein the heat-conducting filler forms a continuous three-dimensional heat-conducting path in a cross-linked polymer network, and the low-melting-point organic medium is uniformly dispersed in the network. Under the ultrahigh filler content, high bulk phase thermal conductivity and high initial viscosity are realized at the same time, and the contradiction between high thermal conductivity and high interface contact resistance is solved. The high viscosity at room temperature is beneficial to operation and storage, and is softened due to melting of an organic medium at the working temperature of a device, so that the interface wettability is dynamically enhanced, and the contact thermal resistance is minimized.

The invention provides a thermal response hydrogel construction method based on solid-liquid interface repulsive force and water content, which comprises the following steps: establishing a coarse graining model of a thermal response polymer network and a water molecule system, and constructing a three-dimensional polymer gel network by adjusting the number of polymer chain monomers and the proportion of a cross-linking agent; constructing a simulation box according to the network geometric dimension and filling the simulation box with water beads; defining interaction parameters among beads under the dissipative particle dynamics model, performing molecular dynamics simulation, counting the mass center of a polymer skeleton and the number of water beads adjacent to an interface, and calculating the equilibrium moisture content; establishing a solid-liquid interface model, and calculating an equilibrium distance and interaction energy between a water bead plane and a polymer skeleton plane at the adsorption temperature; the network polymerization degree is optimized by adjusting the number of polymer chain monomers, and the optimal design of the thermal response desorption performance is achieved. The method provided by the invention is suitable for macroscopic hydrogel structure evaluation, can quickly obtain equilibrium moisture content and interfacial interaction energy, and guides reasonable proportioning and preparation of the hydrogel.

The invention discloses a method for synthesizing eutectic gel by in-situ extraction of lignin, and belongs to the technical field of gel materials.The method comprises the steps that choline chloride and acrylic acid are mixed, heated in an oil bath and stirred, and a eutectic solvent is obtained; cooling the solvent, adding dried and crushed wood powder, heating in an oil bath, extracting to obtain a mixed solution, and centrifuging to obtain supernate; adding a cross-linking agent and an initiator into the supernate, heating, stirring, and cooling to room temperature to obtain a pre-polymerized solution; and pouring the pre-polymerized liquid into a polytetrafluoroethylene mold, and carrying out ultraviolet curing to obtain the target gel. According to the method, the natural structure and active groups of the lignin are reserved to the maximum extent, the method is low-carbon, energy-saving, green and sustainable, in-situ lignin and a polymerization network cooperate, the gel is endowed with higher mechanical strength, environmental stability and functional diversity, and the limitation of existing lignin doped gel is broken through.

The invention discloses a polyphosphazene flame-retardant electrolyte, a lithium ion battery containing the electrolyte and a preparation method of the lithium ion battery, and belongs to the technical field of lithium ion batteries. The electrolyte comprises a lithium salt, an organic solvent, a cosolvent, an additive, a cross-linking agent, a polymer monomer and a polymerization initiator, and is prepared in an in-situ or ex-situ polymerization mode. According to the polymer electrolyte or gel electrolyte provided by the invention, on the basis of various flame-retardant mechanisms of a phosphazene structure and a polymer network structure of a three-dimensional network structure, the overall thermal stability is improved, the intrinsic safety of a battery is improved, the safety risk caused by abuse, overcharge and overdischarge, needling, collision and the like is reduced, and the service life of the battery is prolonged. And a new direction is provided for further developing a multi-element composite flame-retardant material and promoting the safety of a lithium ion battery.

The invention relates to the technical field of battery thermal management, and discloses a wide-temperature-range hydrogel for battery thermal management and a preparation method and application thereof, and the preparation method comprises the following steps: adding polyvinyl alcohol and gelatin into water, heating, stirring and dissolving; then adding sodium alginate and polyhydric alcohols, and continuously stirring; then adding polyacrylic acid, and continuously stirring; adding a cross-linking agent, uniformly stirring, pouring into a mold, degassing, preserving heat, and standing to form hydrogel; immersing the obtained hydrogel into a H2SO4 aqueous solution, vibrating until the hydrogel is completely swelled, heating in a drying oven to constant weight, and washing with deionized water to be neutral; strong hydration groups are introduced into the hydrogel to establish a strong connection structure between water molecules and a polymer network, the water molecules are firmly fixed in the polymer network of the hydrogel to prevent escaping or icing, and a sacrificial network structure is formed through hydrogen bonds to effectively maintain the flexibility of the hydrogel in a wider temperature range, so that the water molecules are effectively prevented from escaping or icing. The thermal management capability in a battery pack is improved.

The invention discloses a preparation method of a modified polyacrylic acid interpenetrating network battery adhesive. The modified polyacrylic acid has dynamic adaptability and structural stability by designing a dynamic cross-linked network system with interpenetrating and intertwining polymer networks, is mainly prepared by adopting an ultraviolet light polymerization means, and aims to solve the problem of structural failure caused by silicon-carbon volume expansion. According to the method, the comprehensive mechanical property of the adhesive is remarkably improved, expansion cracking of the silicon-carbon negative electrode is effectively inhibited, and a technical support is provided for the silicon-carbon negative electrode with high stability, good rate capability, good safety and high capacity.

The invention discloses a rigid-flexible coupling all-solid-state battery suitable for a high-expansion electrode and a preparation method thereof.The all-solid-state battery comprises a composite positive electrode, an all-polymer electrolyte layer and a composite negative electrode which are sequentially assembled, and in-situ polymerization polymer electrolyte networks are constructed in the composite positive electrode and the composite negative electrode; the all-polymer electrolyte layer comprises a polymer electrolyte network constructed by in-situ polymerization, a lithium salt, a plasticizer and a fast ion conductor ceramic filler; polymer electrolyte networks in the composite positive electrode, the composite negative electrode and the all-polymer electrolyte layer are of a double-network structure consisting of a rigid polymer skeleton and a flexible cross-linked polymer network. Through the integrated structural design of the all-polymer electrolyte and the composite electrode, the ionic conductivity, the interface stability, the cycle performance and the safety performance are synergistically improved, and the requirements of high energy density and high-safety energy storage are met.

The invention relates to the technical field of fire extinguishing agents, in particular to a multiphase gel general fire extinguishing agent and a using method thereof. The multiphase gel general fire extinguishing agent comprises a component X and a component Y. The component X and the component Y are both aqueous solutions and are stored separately, the component X comprises 1-10 wt% of water-soluble polymers, and the component Y comprises 0.1-5 wt% of a cross-linking agent. According to the fire extinguishing agent, the water-soluble polymer in the component X and the cross-linking agent in the component Y can react to form a three-dimensional polymer network, meanwhile, water in the solution is completely wrapped in the three-dimensional polymer network, a multi-phase hydrogel product is formed, the mass ratio of the water is very high (90-99%), and the mass ratio of the three-dimensional polymer network is very low (0.05-0.5%). The multiphase gel general fire extinguishing agent provided by the invention has the advantages of good stability, strong water-retaining property, strong burning resistance, strong adhesion, good adaptability, wide applicability, good environmental protection property, recoverable film and the like.

The invention belongs to the technical field of new energy materials, and particularly relates to a solid electrolyte material for a lithium battery and a preparation method thereof. The solid electrolyte material for the lithium battery is a polyurethane elastomer and consists of a polyether ion conduction soft segment and an isocyanate crosslinking hard segment, the soft segment is selected from polyether polyol and accounts for 66-90% of the total mass of the polyurethane elastomer; the hard segment is formed by reacting diisocyanate with a chain extender, and accounts for 10-34% of the total mass of the polyurethane elastomer; and the ether solvent is sealed in the soft segment phase by the polymer network. The polyurethane elastomer disclosed by the invention has high ionic conductivity, excellent mechanical property and good interface compatibility, and can be suitable for different types of lithium batteries, such as lithium ion batteries, lithium metal batteries, high-voltage lithium ion batteries and the like; and the preparation process is simple and suitable for large-scale industrial production.

The invention discloses a high-ionic-conductivity cement-based material based on in-situ polymerization of double ionization monomers as well as a preparation method and application of the high-ionic-conductivity cement-based material. The material comprises a cement base material and a performance additive, wherein the performance additive comprises a functional polymer, a polymer network modifier, an initiator, a cross-linking agent, alkali metal salt and deionized water. The functional polymer is a mixture of a cationic polymerizable monomer and an anionic polymerizable monomer. The preparation method comprises the following steps: stirring and dissolving a functional polymer, a polymer network modifier, alkali metal salt, an initiator and a cross-linking agent in deionized water to obtain a modification additive, uniformly mixing the modification additive and a cement base material, merging into a mold, standing, demolding, and curing to obtain the conductive cement material high ionic conductivity cement-based material. The ionic conductivity of the material can reach 10 <-2 > S / cm or above under normal-temperature and normal-humidity conditions, and the material has high strength and is suitable for the fields of corrosion prevention, structural health monitoring, cement-based energy storage electrodes and the like.

The invention discloses a pH / temperature dual-response type quaternary ammonium salt-nano silver-zinc oxide composite antibacterial coating material as well as a preparation method and application thereof, and belongs to the technical field of antibacterial materials. The antibacterial effective life of the coated product is at least up to 5 years. The coating product is preferably a gastrointestinal endoscope, efficient bacteriostasis is achieved under the condition that the light transmittance of the gastrointestinal endoscope is not affected, biocompatibility is good, safety is high, precise controlled release of silver ions is achieved, and biotoxicity caused by sudden release of the silver ions is avoided. The quaternary ammonium salt-nano silver-zinc oxide composite coating material with the pH / temperature dual-response antibacterial effect is finally obtained through the steps of preparing a composite carrier material, loading antibacterial metal elements, constructing a pH / temperature dual-response polymer network and the like in sequence. A high-performance, safe and environment-friendly antibacterial coating system which is rapid in sterilization, precise in controlled release and long-acting in interference resistance is constructed, and an antibacterial solution with high technical adaptability is provided for the fields of medical treatment, food, water treatment and the like.

The invention discloses a temperature-sensitive response type medical hydrophilic polyurethane intelligent slow-release foam, and relates to the technical field of medical materials, a foam matrix layer is of a three-dimensional porous network structure formed by hydrophilic polyurethane, pores are connected with one another, an intelligent response layer is compounded on the surface of the foam matrix layer and the inner walls of the pores, and the intelligent response layer is formed by compounding the intelligent response layer and the foam matrix layer. The composite intelligent response layer comprises a temperature-sensitive polymer network and a pH-sensitive functional group, the temperature-sensitive polymer network responds to temperature change to dynamically adjust the opening and closing state of pores, and the pH-sensitive functional group responds to an alkaline environment to release antibacterial components. The temperature-sensitive polymer network can dynamically adjust the opening and closing states of the pores: when the wound temperature rises, the hydrophobicity of the polymer is enhanced, the pores automatically shrink to reduce seepage evaporation, and when the temperature drops, the hydrophilicity is recovered, and the pores expand to accelerate discharge of exudate.

The invention discloses a high-flexibility bio-based polyurethane fluorescent material capable of being self-repaired at room temperature and a preparation method of the high-flexibility bio-based polyurethane fluorescent material, and belongs to the technical field of polyurethane materials. The preparation method comprises the following steps: generating a prepolymer from diisocyanate and polypropylene carbonate glycol under the action of a catalyst; carrying out chain extension reaction by taking dimethylglyoxime as a chain extender to generate a polyurethane material PUDMG containing ketoxime bonds; after PUDMG is dissolved, the PUDMG and a mixture of terbium nitrate hexahydrate and europium nitrate hexahydrate are subjected to a coordination reaction, and finally a target product is prepared. By introducing a dimethylglyoxime chain extender, a dynamic ketoxime bond is constructed in a polymer network, and the room-temperature efficient self-repairing of the material is realized; meanwhile, dimethylglyoxime provides effective coordination sites for Tb < 3 + > and Eu < 3 + >, and the dimethylglyoxime, the Tb < 3 + > and the Eu < 3 + > have a synergistic effect, so that the material is endowed with strong fluorescence performance, and meanwhile, the mechanical property and the self-repairing efficiency are further enhanced. The material is simple in preparation method and has a wide application prospect in the fields of flexible electronic devices and anti-counterfeiting.

The invention relates to the technical field of drying agents, in particular to a porous composite gel drying agent and a preparation method thereof. Conventional desiccants are difficult to give consideration to both stable chemical properties and high moisture absorption capacity. In order to solve the problems, the porous composite gel drying agent is provided, lithium chloride, calcium chloride and other hygroscopic salts are introduced to serve as additives in a porous polymerization network of the drying agent and are compounded with the polymer network, and the intrinsic moisture absorption capacity of the material is remarkably improved. The moisture absorption capacity of the obtained porous composite gel drying agent is far higher than that of traditional silica gel, the long-acting moisture absorption requirement in the high-humidity environment can be met, and the porous composite gel drying agent is particularly suitable for the high-end fields of precision electronics, new energy batteries, biological agents and the like with strict requirements for humidity control precision.

The invention relates to the technical field of solid polymer electrolyte, in particular to fluorine ion solid polymer electrolyte as well as a preparation method and application thereof. Aiming at the technical problems of narrow electrochemical stability window, low room-temperature fluorine ion conductivity and poor fluorine ion electrochemical reversibility of the existing electrolyte for the fluorine ion battery, the invention provides the solid polymer electrolyte for the fluorine ion battery based on the hydrogen-bond interaction between a plasticizer and a polymer skeleton. The water-soluble fluorine-containing polymer is prepared from fluorine ion salt, a polymer monomer containing hydroxyl or amino, a cross-linking agent and a protonic plasticizer. Based on the physical confinement of a polymer network, a plasticizer hydrogen bond and a solid polymer skeleton on the plasticizer, the electrochemical stability window of the electrolyte is widened, the high-room-temperature fluorine ion conductivity of the electrolyte is reserved, desolvation of fluorine ions is promoted, migration barriers of an interface and a bulk phase are reduced, and the performance of the electrolyte is improved. The reaction activity and the battery reversibility are improved, and the application prospect is good.

The invention discloses a hydrophobic, heat-insulating and flame-retardant integrated aerogel composite material and a preparation method thereof, and relates to the technical field of aerogel materials, the composite material comprises a polyimide-polyurethane hybrid polymer aerogel skeleton, a bionic directional micro-channel structure and an anchored graphene and carbon nanotube composite photothermal conversion layer are arranged in the skeleton, and a double-microcapsule self-repairing system is uniformly dispersed; the surface of a framework is modified with a perfluoroalkylsilane hydrophobic layer, a phosphorus-nitrogen-silicon synergistic flame-retardant system is introduced into a hybrid polymer network, and the preparation method comprises the steps that printing ink containing a double-microcapsule self-repairing system and a flame retardant is prepared, a gel blank is constructed through direct-writing forming 3D printing, and after freeze drying and programmed temperature rising thermal imidization treatment, the flame-retardant self-repairing gel is obtained. The hydrophobic layer is modified through chemical vapor deposition, and the composite material has hydrophobic, heat-insulating and flame-retardant properties and micro-damage self-repairing capability, and is suitable for the fields of aerospace, building heat preservation, new energy and the like.

The invention discloses a high-performance ceramic ultra-fast degreasing and sintering method based on photocuring additive manufacturing, and relates to the technical field of photocuring additive manufacturing. The method comprises the following steps: preparing a monomer containing chemical functional groups for photo-crosslinking reaction and thermal crosslinking reaction or high polymer photo-cured ceramic slurry with high solid phase content; carrying out photocuring molding to obtain a printing green body; and the printing green body is subjected to ultra-fast degreasing and ultra-fast high-temperature sintering through ultra-fast high-temperature sintering equipment based on Joule heating. According to the invention, a monomer or high polymer system with photo-crosslinking and thermal crosslinking dual-mechanism reactions is introduced, and a polymer network skeleton with high strength and high decomposition rate is constructed in a printing green body. According to the slurry system, the green body can bear an extremely high temperature rise rate without cracking, deformation or bubbling in Joule heating ultra-fast high-temperature sintering equipment, so that organic matters are quickly and thoroughly removed, and the degreasing efficiency and reliability are remarkably improved.

The invention relates to the technical field of antibacterial materials, and provides a light-enzyme-heat synergistic antibacterial nano composite material and a preparation method thereof.The preparation method comprises the steps that 1, a copper-based chalcogenide with a plasma resonance effect serves as a structural template, a transition metal oxide intermediate layer and a bismuth oxyhalide epitaxial layer are sequentially constructed on the surface of the copper-based chalcogenide with the plasma resonance effect through a step-by-step continuous solvothermal method, and the copper-based chalcogenide with the plasma resonance effect serves as the structural template; forming a core-shell heterojunction with Z-type energy band matching; (2) pre-assembling a natural enzyme and a monatomic nano-enzyme in a buffer system to form a composite catalytic unit with an electron transfer channel; and (3) by taking the core-shell heterojunction as a polymerization core, under the precise temperature control condition of 0-10 DEG C, initiating active free radical polymerization through an interface, constructing a thermal response polymer shell layer on the surface of the heterojunction, and encapsulating the composite catalytic unit in a functional microdomain of a polymer network in situ. The anti-bacterial fabric can achieve a better synergistic anti-bacterial effect.

The invention relates to the technical field of coatings, in particular to a high-resistance sunscreen cream and high-chemical-resistance two-component PU coating for automotive interior parts and a preparation method of the high-resistance sunscreen cream and high-chemical-resistance two-component PU coating. Acrylic polyol resin and nano-silica modified polyester polyol are matched with an HDI tripolymer and an IPDI prepolymer to form a multi-dimensional polymer network structure; the difficulty that a chemical medium permeates and diffuses into the coating is increased; a fluorocarbon chain has extremely low surface energy and shows excellent adhesion resistance to oily components, silicone oil and the like in the sunscreen cream; through the synergistic effect of the benzotriazole ultraviolet light absorber and the nano silicon dioxide modified polyester polyol, the chemical resistance of the coating is further prolonged, in conclusion, the coating has high chemical resistance, sunscreen cream resistance and excellent mechanical performance, and the problems that in the prior art, a coating is prone to being eroded by chemical media and insufficient in durability can be solved.

The invention relates to a preparation technology of an active bio-based food preservative film with high barrier property and high antibacterial rate, in particular to the field of food packaging and food preservation. The method comprises the following steps: by taking chitosan as a matrix, firstly, loading gallic acid by using nanoparticles prepared from the chitosan and sodium tripolyphosphate; and then, adding the chitosan nanoparticles loaded with gallic acid into a chitosan polymer network to prepare a chitosan-nanoparticle composite film, and preparing the film with high flexibility, high barrier property and high antibacterial activity. The aquatic product preservative has excellent mechanical property, barrier property, biological activity and biodegradability, can effectively prolong the shelf life of aquatic products, and has wide application prospects in the fields of food industry, preservation and the like.

The present invention relates to an electrochemical cell comprising an anode, a polymer electrolyte and an NMC type cathode active material. The polymer electrolyte comprises an electrolyte composition, preferably comprising a deep eutectic solvent (DES), and a polymer network having a polyacrylamide backbone.

The invention discloses a microphase separation hydrogel electrolyte with ion selectivity and a preparation method and application thereof. The electrolyte is prepared by constructing a microphase separation polymer network composed of a polyanionic polymer and an ion exchange group-containing polymer in a synergistic manner and inducing crosslinking by using metal ions. The formation of a continuous ion transmission channel in the hydrogel is realized. The technical problem that high ionic conductivity and high ionic transference number are difficult to obtain at the same time in a traditional hydrogel electrolyte is solved, spatial unwrapping and selective coordination of a polymer chain segment are induced through a microphase separation structure, and directional construction of an ion channel is achieved; and the ion conductivity of the electrolyte is remarkably improved, and meanwhile, the target ion transference number is further improved. The prepared hydrogel electrolyte has high mechanical stability, high ion flux and excellent ion selectivity, and can be widely applied to high-performance electrochemical devices such as batteries.

A process for preparing a supramolecular carrier photosensitizer for photodynamic therapy and a formulation thereof is disclosed for prevention, treatment, anti-inflammatory and sterilization of oral dental diseases. Supramolecular carrier consists of refined lignin, glucomannan, cysteine, and sodium benzoate at a mass ratio of 0.1-1.0%: 0.5-3%: 0.1-0.5%: 0.05%, and the balance of water. Aqueous solutions of refined lignin, glucomannan, cysteine and sodium benzoate are prepared, and a pH value of combined solution is adjusted to 6.5, so that dissolved alkali lignin is precipitated to form an efficient and stable three-dimensional polymer network skeleton, and rich hydrogen bonds are facilitated to be formed between the same molecules and different molecules of lignin and glucomannan, thereby forming a supramolecular carrier formulation loaded with the photosensitizer. It ensures long-term storage stability of physicochemical traits of formulation, which is conducive to rapidly promoting application of PDT in anti-inflammatory and sterilization treatment of oral dental diseases.