22results about How to "Increased free volume" patented technology

The invention relates to the technical field of all-vanadium redox flow batteries, in particular to a sulfonated polybenzimidazole proton exchange membrane as well as a preparation method and application thereof. The proton exchange membrane structurally comprises a polybenzimidazole polymer main chain and a sulfonic acid group, the free volume of the polybenzimidazole polymer is regulated and controlled by synthesizing raw materials with different structures, and the polybenzimidazole proton exchange membrane is obtained by sulfonating the polybenzimidazole polymer. Aiming at the problems of cross permeation of vanadium ion electrolyte of a positive electrode and a negative electrode of the all-vanadium redox flow battery, capacity attenuation of the all-vanadium redox flow battery and low energy conversion efficiency, the preparation method comprises the following steps: constructing a polybenzimidazole polymer main chain by selecting raw materials with high rigidity and high free volume; the mechanical property of the polybenzimidazole membrane is improved while a rapid ion channel is constructed in the polymer membrane, and water molecules can be contained to limit swelling of a membrane material.

The invention relates to a positive photosensitive polyimide composition with high elongation at break and application of the positive photosensitive polyimide composition. The photosensitive polyimide composition comprises polyamide acid resin, diazonaphthoquinone sulfonate, a thermal crosslinking agent, a surfactant, a flexibility aid and a solvent. According to the positive photosensitive polyimide composition disclosed by the invention, on one hand, the flexibility auxiliary agent can be used for remarkably improving the elongation at break of a photosensitive polyimide film on the premise of not influencing the tensile strength of the photosensitive polyimide film and improving the mechanical properties of flexibility and bending resistance of the photosensitive polyimide film; on the other hand, the uniformity that a solvent volatilizes and escapes from the interior of a film after the photosensitive polyimide composition is glued is improved, and the flatness of the cured photosensitive polyimide is improved; in addition, a certain effect of reducing the curing temperature of the photosensitive polyimide is achieved.

This invention discloses a polyolefin-containing DCPD epoxy resin and a copper-clad laminate composition thereof, and its preparation method. The method is characterized by: polymerizing polyallyl phenol and catalyst A at high temperature to form polyallyl phenol; then reacting DCPD, polyallyl phenol, and catalyst B at high temperature to form a polyolefin-containing DCPD phenol resin; subsequently, epoxidizing the resin with epichlorohydrin and alkaline catalyst C to synthesize a polyolefin-containing DCPD epoxy resin; finally, mixing the resin with maleimide resin, phosphorus-containing phenolic resin, imidazole accelerator, inorganic filler, and solvent to obtain the polyolefin-containing DCPD epoxy resin composition for copper-clad laminates. The polyolefin-containing DCPD epoxy resin and copper-clad laminate composition prepared by this invention exhibits low dielectric constant, low dielectric loss, and high heat resistance, making it particularly suitable as a raw material for copper-clad laminates and highly practical.

This invention provides a photoresponsive, deformable liquid crystal polyurethane material containing cyanostilbene, its preparation method, and its applications, belonging to the field of intelligent polymer materials technology. This invention introduces cyanostilbene liquid crystal units into a polyurethane system via short-chain spacer groups. Utilizing the characteristics of cyanostilbene under ultraviolet light irradiation (requiring trans / cis isomerization), its photothermal effect, the stability of the cis isomer structure, and the ability of the cis isomer to lower the glass transition temperature of the polymer, as well as the strong coupling effect between the cyanostilbene liquid crystal units and the main chain, a photoresponsive, deformable liquid crystal polyurethane material with high mechanical properties, high processability, high deformation rate, large deformation degree, and strong photostress can be prepared. This photoresponsive, deformable liquid crystal polyurethane material has wide applications in fields such as micro-optically driven robots, artificial muscle flexible actuators, and 4D-printed programmable deformable structures.

The present invention relates to a polyamic acid and a polyimide fiber thereof and a preparation method thereof. The polyamic acid has a structure as shown in the following formula 1, wherein Ar is an aromatic residue containing a bridging structure; m is the molar ratio of a repeating unit having a structure of formula 2 in the polyamic acid, and 0.6≤m≤0.9. The polyimide fiber of the present invention has a breaking strength greater than 3.0 GPa, a modulus greater than 100 GPa, and an elongation at break greater than 4%, which solves the problem in the prior art that high-strength and high-model polyimide fibers are relatively brittle during imidization, have a generally low elongation at break, and are not conducive to continuous production and further processing.

The present application relates to the technical field of gel electrolyte for supercapacitor, in particular to a gel electrolyte based on lysozyme amyloid fibers and application thereof. The ion conductivity of the conventional plant protein-based gel electrolyte is poor, and the electrical performance needs to be further improved. In view of the above problems, the present application provides a gel electrolyte based on lysozyme amyloid fibers. The lysozyme in the formula self-assembles into amyloid fibers under acidic conditions, and the surface of the amyloid fibers is rich in polar groups such as hydroxyl, carboxyl and amino groups, which can effectively promote the dissociation of lithium salt. At the same time, the three-dimensional network structure formed by the self-assembly of the fibers. Glycerol as a small molecule plasticizer inserts between the polymer chains. Lithium perchlorate and other lithium salts can provide high concentration of free lithium ions due to the large anion volume and low dissociation energy. The above components synergize and jointly act, effectively improving the comprehensive electrical performance of the gel electrolyte.

The invention discloses a PVC / SBS modified material and a preparation method thereof, and belongs to the technical field of polymer materials. The PVC / SBS modified material comprises the following raw materials in parts by weight: PVC: 80-100 parts, SBS: 20-40 parts, plasticizer: 3-30 parts, flame retardant: 2-4 parts, antioxidant: 5-8 parts, stabilizer: 2-3 parts, lubricant: 3-5 parts; the invention adopts urotropine and tromethamine to react to prepare a first-generation polymer, and then performs modification through esterification, epoxidation and acetylation reactions, and finally prepares an environmentally friendly plasticizer. The PVC / SBS modified material prepared by the invention has excellent mechanical strength and impact resistance.

The application discloses a copper-molybdenum-copper composite material and a flexible deep processing method thereof, and comprises the following steps: adding pure molybdenum metal powder into a solvent and a dispersing agent, and after once ball milling, adding a thickening agent and a binder, and after twice ball milling and defoaming, molybdenum slurry for casting forming is obtained; the molybdenum slurry for casting forming is placed on a base strip, and after drying, a molybdenum film is obtained by adjusting a scraper height gap and a base strip speed; a certain thickness of copper slurry for printing is screen printed on upper and lower surfaces of the molybdenum film, and after drying and hot isostatic pressing, a copper-molybdenum-copper composite material flexible film is obtained; the copper-molybdenum-copper composite material flexible film is placed in a stamping die cavity to be bent, and after low-temperature curing, shaping and demolding, and after degumming and integrated co-firing, the copper-molybdenum-copper composite material with bending size requirements is obtained. The application has the advantages of simple process, precise component control, good precision, high finished product rate and the like.

The invention relates to an organic solvent-resistant nanofiltration membrane and a preparation method thereof, the nanofiltration membrane comprises a bottom support layer, a middle buffer layer, a compact selection layer and a top protection layer which are stacked in sequence, and the surface of the bottom support layer contains active functional groups; the compact selection layer is a cross-linked polyamide network; the top protection layer is formed by curing a fluorine-containing amphiphilic block copolymer; the middle buffer layer is a zwitterionic copolymer network containing a reactive functional group, and the zwitterionic copolymer network containing the reactive functional group is formed by curing a zwitterionic monomer mixed solution containing the reactive functional group; wherein the reactive functional group comprises an amino group, an epoxy group and a zwitterionic structure provided by a sulphobetaine methacrylate unit. According to the invention, a four-layer gradient structure is constructed, and three reactive functional groups of amino, epoxy group and zwitter-ion structure are introduced into the middle buffer layer, so that the nanofiltration membrane has excellent interface stability and separation performance under the washing of a strong-polarity organic solvent.

This invention discloses a photochromic material incorporating a HOF (Hormone-Organic-Flatform) framework, its preparation method, and its applications. Belonging to the field of organic solid-state photochromic materials technology, it utilizes a host-guest eutectic method to load photochromic molecules onto the HOF framework material. This invention also discloses the photochromic material prepared by the above method, and its applications in information storage encryption and anti-counterfeiting. While achieving photochromism, the host-guest eutectic method exhibits a faster photoresponse rate and better photochromic performance compared to physical adsorption methods, showing greater potential in anti-counterfeiting and excellent information storage encryption capabilities.

The invention discloses a PVC / polyester composite material for a high-performance hose and a preparation method thereof. The composite material is prepared from the following components: 60-70 parts of PVC resin, 15-30 parts of polystyrene resin, 10-30 parts of filler, 5-15 parts of polyester plasticizer, 8-16 parts of composite modifier, 0.5-2 parts of lubricant, 1-2 parts of heat stabilizer and 0-1.5 parts of colorant. The addition of the composite modifier significantly improves the compatibility of PVC with other components and enhances the interface bonding force, so that the final material has excellent heat resistance, weather resistance and mechanical strength.

The invention relates to the field of preparation of high polymer materials, in particular to a flexible irradiation crosslinking polyethylene foam material with high tensile strength and a preparation method thereof. According to the method, an elastic grafted polyion brush functional component is compounded with low-density polyethylene, so that the flexibility and tensile strength of the polyethylene foam can be effectively improved, and the polyethylene foam material with flexibility, high tensile strength and no corona gluing is obtained. The method disclosed by the invention has the following advantages: (1) the product is good in flexibility and high in tensile strength, and when the apparent density is lower than 0.1 g / cm < 3 > and the thickness is 1mm, the elastic modulus is below 0.8 MPa, the tensile strength is more than 1.6 MPa, and the elongation is more than 250%; (2) the cohesiveness of the product is high, the surface tension can reach 39 mN / m or above, the requirement of a gluing process is met, and the surface tension can be maintained for 6 months or above; and (3) the obtained product has wide application in the fields of precision mechanical shock absorption, electronic equipment, electronic screen protection and the like.

The application relates to the technical field of heat-curable crosslinking agents, in particular to vinylbenzyl fluorene containing a benzocyclobutene group and a preparation method and application thereof, wherein the preparation method of the vinylbenzyl fluorene containing the benzocyclobutene group comprises the following reaction steps: S1. adding fluorene, a solvent, a strong base and a phase transfer catalyst into a reaction container, adding 4-bromobenzocyclobutene dropwise into the reaction container under inert atmosphere, continuous stirring and constant temperature conditions, sequentially performing treatment of solvent removal under reduced pressure, extraction, washing, solvent removal under reduced pressure in the organic phase, and obtaining a target intermediate product; S2. adding the target intermediate product, 4-vinylbenzyl chloride, a solvent, a weak base and a phase transfer catalyst into a reaction container, performing reaction under inert atmosphere, continuous stirring and constant temperature conditions, sequentially performing treatment of solvent removal under reduced pressure, extraction, washing, solvent removal under reduced pressure in the organic phase and recrystallization, and obtaining the vinylbenzyl fluorene containing the benzocyclobutene group.

The invention discloses a preparation method and application of an oxide glass electrode of a lithium ion capacitor, and belongs to the technical field of oxide glass electrodes, and the preparation method of the oxide glass mainly comprises the following steps: weighing glass raw materials according to glass composition, uniformly mixing, heating, melting, cooling and annealing, grinding the annealed glass into glass powder, and preparing for preparing an electrode plate; the preparation method comprises the following steps: weighing an active substance, a conductive agent and a binder in proportion, mixing in a ball milling tank, and dropwise adding a proper amount of dispersant for ball milling; blade-coating the slurry on a metal aluminum foil current collector for drying; and cutting the dried pole piece into electrode slices by using a slicing machine to prepare for assembling the lithium ion capacitor. According to the preparation method and application of the oxide glass electrode of the lithium ion capacitor, the obtained oxide glass electrode shows excellent electrochemical performance, meanwhile, the production process is simple, no pollution is caused to the environment, good application prospects are achieved, and more choices are provided for electrode materials of the lithium ion capacitor.

The invention discloses a polyimide film for capacitors and a production process thereof, belonging to the technical field of polyimide films. An anhydride-terminated polyamic acid solution, an isocyanate-terminated polybutadiene and a nano-alumina hollow sphere are prepared into a copolymer slurry, and a film is cast, biaxially stretched, and imidized to obtain a polyimide film for capacitors. The introduction of the isocyanate-terminated polybutadiene further increases the rotation ability of the polymer chain, improves the elongation at break of the polyimide film, and improves the processing performance of the micron-grade polyimide film. The nano-alumina hollow sphere has a low thermal expansion coefficient and good stability, and can balance the influence of the isocyanate-terminated polybutadiene on the thermal stability of the polyimide film. The addition of the nano-alumina hollow sphere helps to further reduce the dielectric loss of the polyimide film, which helps to use it in automotive capacitors.

This invention relates to the field of polymer materials technology, and more particularly to a polyamide-imide polymer, its preparation method, and its applications. This invention uses a polyamide-imide polymer having the structure shown in Formula I to prepare a polyamide-imide film. The polyamide-imide polymer uses 2,2'-di(trifluoromethyl)diaminobiphenyl as a diamine monomer and 5,5'-(1,4-phenylene)bis[hexahydro-4,7-methanolisobenzofuran-1,3-dione] as an anhydride monomer, which is copolymerized with terephthaloyl chloride in different proportions and 2,2'-di(trifluoromethyl)diaminobiphenyl to obtain the polyamide-imide polymer, and then to prepare the polyamide-imide film. The PAI film prepared by this invention has high visible light transmittance, low coefficient of thermal expansion and mechanical properties, and good solubility in most organic solvents, making it easy to process and showing broad application prospects in the optoelectronic field.

The invention relates to the technical field of separation and extraction of natural products, in particular to a method for supercritical separation and extraction of astaxanthin, which comprises the following steps: (1) weighing raw material components in parts by weight; (2) mixing a biomass raw material rich in astaxanthin with the functionalized deep-eutectic solvent, and performing physical field enhanced extraction to obtain an extracting solution; (3) filtering the extracting solution through a vibrating membrane, and purifying to obtain a trapped fluid containing astaxanthin; and (4) carrying out supercritical CO2 back extraction on the trapped fluid, separating to obtain an astaxanthin product, and recovering the functional eutectic solvent. According to the method, continuous membrane separation and purification under the eutectic solvent system are realized, the purity of astaxanthin and the proportion of all-trans astaxanthin are maintained while the extraction rate of astaxanthin is increased, the solvent can be recycled after being recovered, and the production cost and waste liquid discharge are greatly reduced. All the raw materials are nontoxic and harmless, no organic solvent is used in the technological process, and good application prospects are achieved.

The present invention discloses a logistics packaging box based on functional plastics and a manufacturing process thereof, and relates to the technical field of functional plastics. The manufacturing process of the logistics packaging box based on functional plastics of the present invention comprises the following steps: putting the functional plastic into an injection molding machine for injection molding to obtain a logistics packaging box; the preparation method of the functional plastic comprises the following steps: blending polypropylene, an additive, white carbon black, a plasticizer, a light stabilizer, and a lubricant to obtain a mixture; putting the mixture into a twin-screw extruder for extrusion and granulation to obtain a functional plastic; the additive prepared in the present application is added to the functional plastic to effectively improve the low-temperature toughness of the material.

The invention belongs to the technical field of high polymer materials, and particularly relates to ABS-PS composite plastic with a high melt flow rate and a preparation method of the ABS-PS composite plastic. The preparation method comprises the following steps: S1, performing surface modification on montmorillonite powder by using chlorinated 1-hexadecyl-3-methylimidazole to obtain ionic liquid modified montmorillonite, and then mixing the ionic liquid modified montmorillonite, ABS resin and SAN resin for melting modification to obtain a modified ABS material; s2, mixing the modified ABS material, the PS material, a compatilizer, a titanate coupling agent and an antioxidant by using a high-speed mixer, and then feeding the mixture into a double-screw extruder for mixing and granulating to obtain the ABS-PS composite plastic with the high melt flow rate. The composite plastic disclosed by the invention has a relatively high melt flow rate and excellent flame retardant property, so that the composite plastic can be better applied to shells of household appliances such as air conditioners and the like.

This application discloses a nanofluidic gel-mixed matrix membrane for olefin / alkane separation, its preparation method, and its application, belonging to the field of membrane separation technology. The membrane is composed of a polymer matrix and a nanofluidic filler. The filler includes a crown core, a linker, and a crown layer. The crown core is a porous material with preferential adsorption for olefins, and the crown layer is a liquid organic material containing specific structures and functional groups. The crown layer is chemically bonded to the surface of the crown core to form the nanofluidic filler, which is then combined with the polymer matrix to prepare the gel-mixed matrix membrane. This application uses nanofluids as fillers, enabling membrane gelation, solving the problems of traditional filler aggregation and interfacial compatibility, and significantly improving the membrane's separation performance for olefins / alkanes, while also exhibiting high mechanical strength and stability. This membrane is particularly suitable for the efficient separation and purification of low-carbon olefins such as ethylene / ethane, propylene / propane, and propylene / N2.

This invention relates to the field of dielectric materials technology, specifically to a composite filler-reinforced copper clad laminate substrate material with excellent dielectric properties. This material addresses the problems of high dielectric constant, high dielectric loss, and poor bending performance in existing copper clad laminate substrate materials. The matrix material incorporates benzocyclobutene-tetraphenylethylene grafted POSS and piperazine-based hyperbranched polysiloxane-modified boron nitride. The benzocyclobutene structure has low dielectric properties, reducing electronic polarizability; tetraphenylethylene increases free volume, hindering electron transfer and lowering the dielectric constant; the rigid structure of POSS inhibits chain segment movement, reducing dielectric loss; and the boron nitride in the piperazine-based hyperbranched polysiloxane-modified boron nitride has a low dielectric constant, the piperazine ring reduces the molar polarizability of the molecular chain, lowering the dielectric constant; and the siloxane segments provide a flexible buffer layer, improving the bending strength of the material. This results in good stability of the material under high-frequency application conditions.

The invention discloses heat insulation type artificial turf bottom gum and a preparation method thereof, and belongs to the technical field of artificial turf bottom gum. The heat insulation type artificial turf bottom gum prepared by the invention is prepared by compounding the following raw material components: flame-retardant modified carboxylated styrene-butadiene emulsion, calcium carbonate, high-dispersion hollow glass beads, a thickening agent, carbon black and 2, 4-diaminophenol; the flame-retardant modified carboxylic butadiene-styrene emulsion is prepared from styrene, butadiene, allyl phenoxy cyclotriphosphazene, tetramethyl tetravinyl cyclotetrasiloxane, acrylic acid, an emulsifier, an auxiliary agent and water; the high-dispersion hollow glass beads are obtained by modifying hollow glass beads with tetraethoxydisiloxane; wherein the tetraethoxydisiloxane is obtained by carrying out a click reaction on mercaptobenzaldehyde and 1, 3-divinyl-1, 1, 3, 3-tetraethoxydisiloxane, and the tetraethoxydisiloxane is obtained by carrying out a click reaction on mercaptobenzaldehyde and 1, 3-divinyl-1, 1, 3, 3-tetraethoxydisiloxane; the heat insulation type artificial turf bottom gum prepared by the invention is good in mechanical property and heat insulation property.