180 results about "Comonomer" patented technology

The application provides a high-flexibility dielectric positive electrode binder and a preparation method thereof and a solid-state battery positive electrode. The high-flexibility dielectric positive electrode binder comprises a fluoropolymer matrix and a fast ion conductor; the fluoropolymer matrix is a copolymer of vinylidene fluoride (VDF) and a fluorine-containing comonomer, the fast ion conductor is in a one-dimensional nanowire shape and is dispersed in the fluoropolymer matrix; and the mass fraction of the fast ion conductor is 1% to 20% based on the fluoropolymer matrix. The application can simultaneously solve three core problems of physical continuity of an ion conduction path in the positive electrode, inhibition of a space charge layer at an interface and mechanical coating of active particles, thereby significantly improving the rate performance, cycle stability and actual energy density of the solid-state battery.

The present invention relates to a polypropylene composition, a process for obtaining the same and an article, in particular an extruded article, such as an automotive part, comprising the same. The PP composition comprises 20-60 wt% of a first heterophasic propylene copolymer (HECO1) having a MFI of at least 60 dg / min; 10-40 wt% of a second heterophasic propylene copolymer (HECO2) having a MFI of at most 55 dg / min; 2-20 wt% of a first elastomer consisting of ethylene and octene monomers having a density of at most 0.860 g / cm 3 ; 2-20 wt% of a second elastomer comprising ethylene and alpha-olefin comonomers having 4 to 8 carbon atoms having a density of at least 0.861 g / cm 3 ; and 2-30 wt% of talc having an aspect ratio in the range of 100-140.

The present disclosure relates to polyethylene copolymers. The polyethylene copolymers include 90 wt% or greater ethylene units and a remainder balance of C3-C20 comonomer units. The polyethylene copolymers have a melt index of about 0.1 g / 10min to about 2.2 g / min, a high load melt index (HLMI) of about 10 g / 10 min to about 50 g / 10 min, a melt index ratio (MIR) of about 20 to about 35, a molecular weight distribution (MWD) of about 3 to about 7, a melt strength of about 0.03 N to about 0.10 N, a ∆CWF / ∆T of about wt% / 0.02 °C to about 0.03 wt% / °C, a SignCDI *ɳ0*1032 / (Tan delta (ω=0.1) * MW6.82) of about 2 Pa*s / [(g / mol)6.82]to about 8 Pa*s / [(g / mol)6.82], and a CDI_NWZ,w of about 0.200 to about 0.33.

The application discloses a method for preparing photoelectric dual-response sensing polymer materials with self-repairing performance by using commercial olefin precursors and functionalized polymers based on the method; the method directly copolymerizes flexible comonomers and vinyl aromatic hydrocarbon monomers, and under suitable polymerization conditions, the two monomers are polymerized in a random copolymerization manner to generate functional polymers with micro-phase separation characteristics; the above method provided by the application can upgrade the commercial olefin monomers to obtain self-repairing performance, optical and electrical sensing performance, the conversion efficiency is high, the process is simple, the functionalization upgrading of the olefin polymers lacking of functions can be fully realized, the cost can be significantly reduced, the environmental pollution and resource waste can be reduced, and the application range of the olefin materials is widened.

A drug-polymer conjugate, which is a copolymer of at least one monomer of formula (I) where: X may be the same or different at each occurrence and represents a terminal functional group comprising an alkyne or an azide; Q is independently selected at each occurrence and may be present or absent and when present, represents a linking group; R is selected from the group consisting of linear or branched hydrocarbon, optionally substituted aryl and optionally substituted heteroaryl; D is a releasable bicyclic prostaglandin; L is a linker group; and at least one co-monomer of Formula III J-(Y1-A)n, J represents a linking functional group, n is 2 to 8 preferably 3 to 8; Y1 comprises a polyether of formula (ORa)m wherein Ra is independently ethylene, propylene and butylene and m is from 1 to 300 (preferably 2 to 300) and the polyether is in chain with one or more groups which are preferably selected from one or more of optionally substituted straight or branched C1 to C10 alkylene, amino, ether, ester, amide, carbonate and carbamate; A may be the same or different at each occurrence and represents a group comprising a terminal functional group comprising an alkyne or an azide functionality, wherein said terminal functional group is complementary to the terminal functional group X of formula (I) providing triazole moieties from reaction of X and A.

The application belongs to the technical field of membrane distillation, and discloses a kind of persistent super-hydrophobic uniform pore separation membrane and its preparation method and application, monomer, polymer membrane material, solvent, pore-forming agent, initiator are mixed according to proportion, constant temperature stirring, under nitrogen atmosphere and polymer membrane material conventional dissolution temperature, initiate in-situ copolymerization, form casting solution containing strong hydrophobic crosslinkable copolymer A-B, then the casting solution is made into nascent liquid membrane, through short time spray treatment accelerates liquid membrane surface interface phase separation, then the membrane is immersed in coagulation bath and crosslinked and solidified, to obtain persistent super-hydrophobic uniform pore separation membrane, its water contact angle is greater than 150°, and the tensile strength is greater than 3.5 MPa. The preparation method is simple in operation, and the reaction conditions are mild. In the process of membrane preparation, the membrane material is persistent super-hydrophobic and the pore size is uniform, which promotes the improvement of the membrane anti-wetting ability.

The waterproof emulsion suitable for the polymer cement waterproof coating in a low-temperature and high-humidity environment is prepared by a free radical emulsion polymerization reaction, with a vinyl monomer, 2-acrylamide-2-methyl propane sulfonic acid and the like as a comonomer, through anion / emulsion emulsifier and mechanical stirring, dropwise adding an initiator, and with functional additives and preservatives, to obtain a benzene and propylene emulsion containing carboxylic acid group, sulfonic acid group and phosphoric acid group. The polymer cement waterproof coating prepared by using the benzene and propylene emulsion has good mechanical properties, good chelation, low limit inhibition and lattice distortion, can easily be adsorbed on the tiny calcium carbonate crystal grains in a low-temperature and high-humidity environment, and the like, prevents the formation and precipitation of calcium carbonate, and has strong anti-efflorescence ability.

Disclosed in the present disclosure are a foamable composition, a biodegradable PMI foam, and a preparation method therefor. The foamable composition comprises comonomers, an initiator, a foaming agent, and a crosslinking agent, wherein the comonomers comprise a first comonomer and a second comonomer, the first comonomer being one or two selected from methacrylonitrile or acrylonitrile, and the second comonomer being selected from methacrylic acid. The composition further comprises a degradation agent, and the degradation agent is one or a combination of two or more selected from polylactic acid, starch-based polyether polyol and polycaprolactone, the weight ratio of the degradation agent to the comonomers being 30-132:180. The foamable composition of the present disclosure involves scientific addition of the degradation agent and regulation on the formula and uses in-situ polymerization technology, thereby improving the biodegradation rate of the PMI foam while retaining the original high performance of the PMI foam.

The present invention relates to polydithioacetal copolymers, preferably which are degradable or biodegradable, to a method for manufacturing same by free-radical polymerization, to the uses thereof, to the use of dithiolactones as precursor comonomers in a free-radical polymerization, and to dithiolactones for the preparation of said copolymer or for the implementation of said method. More particularly, the present invention relates to a method for preparing copolymers, preferably which are degradable or biodegradable, by free-radical polymerization using in particular at least one dithiolactone monomer and at least one monomer comprising an ethylenic unsaturation.

This invention discloses a polymer coating material and its preparation method, as well as its application in artificial graphite anode materials. The polymer is synthesized from monomers, comonomers, and reaction auxiliaries under the action of an initiator. By controlling the amount of reaction auxiliaries added, the molecular weight of the polymer is controllable, and the side functional groups are adjustable. This polymer can uniformly coat the surface of artificial graphite, forming an artificial solid-state electrolyte interface, optimizing the lithium-ion transport path, and constructing a stable protective layer for the artificial graphite anode material. It can effectively improve the initial coulombic efficiency of the artificial graphite anode material, achieving an initial coulombic efficiency ≥91.8%.

This invention provides a method for preparing and applying an ester resin. The fluorinated acrylate resin includes polymerizable monomers, an initiator, and a fluorinated comonomer. This invention prepares a fluorinated acrylate copolymer via bulk polymerization, exhibiting excellent solvent resistance, hydrophobicity, and toughness, solving the problems of high water absorption and poor solvent resistance in traditional polymethyl methacrylate (PMMA) films. The preparation method employs a mild polymerization process with a simple procedure. By rationally controlling the monomer ratio and reaction conditions, the resin retains its original advantages such as high light transmittance (>92%), light weight, and ease of processing while improving hydrophobicity and solvent resistance, and simultaneously enhancing material toughness. The fluorinated acrylate resin prepared by this invention has a stable structure and excellent performance, and can be widely used in transparent protective coatings, optical films, hydrophobic functional materials, and other fields, effectively broadening the application range of PMMA materials.

Ethylene, and one or more polar comonomers, and optionally one or more (C3-C3) 12 A process for polymerizing α-olefins and optionally aluminum compounds in the presence of a catalyst system to form ethylene copolymers in a high-pressure reactor at a pressure greater than 1000 barg and a temperature greater than 100°C, wherein the catalyst system includes a transition metal catalyst.

This invention discloses a solid electrolyte, its preparation method, and its application, relating to the field of battery technology. The raw material components of the solid electrolyte include comonomers, lithium salts, and initiators. The comonomers include chain acrylate monomers containing ether bonds and cyclic carbonate monomers. The solid electrolyte provided in this application can solve the technical problems of existing technologies, such as the flammability and leakage hazards of traditional liquid electrolytes, the difficulty in balancing ionic conductivity and flexibility with high interfacial impedance in existing polymer electrolytes, and the complex and inefficient preparation processes.

The present invention relates to a foamed article comprising a polymeric composition comprising a propylene copolymer having a comonomer selected from moieties derived from ethylene, an alpha-olefin having 4 to 20 carbon atoms, or a combination thereof, wherein the propylene copolymer has a comonomer content of 2.5 to 5.0 wt% based on the propylene copolymer, and the propylene copolymer has a xylene soluble fraction determined according to ISO 16152:2005 of 3.0 to 7.5 wt% based on the propylene copolymer.

The application relates to the technical field of fiber materials, and provides high-flame-retardant aramid fibers and a preparation method. An inorganic salt is dissolved in a solvent, and p-phenylenediamine is added to obtain a main monomer solution; a phosphorus-containing aromatic difunctional monomer and a silicon-containing aromatic difunctional monomer are dissolved in a solvent to obtain a flame-retardant comonomer solution; p-phthaloyl chloride is added to the main monomer solution to perform a prepolymerization reaction, and a prepolymer solution is obtained; the flame-retardant comonomer solution is added to the prepolymer solution, and p-phthaloyl chloride is added to perform a polycondensation reaction, and a copolymerized p-aramid polymer is obtained; the copolymerized p-aramid polymer is separated, washed, dried, and dissolved in concentrated sulfuric acid to obtain a spinning solution, and the high-flame-retardant p-aramid fibers are obtained after the spinning solution is post-treated. The phosphorus-containing aromatic difunctional monomer and the silicon-containing aromatic difunctional monomer are introduced in the aramid polymerization process, and the copolymerized p-aramid fibers with flame retardance and fiber-forming property are obtained.

This invention relates to the field of polymer molding technology, specifically to a high-temperature resistant, dimensionally stable acrylic sheet and its preparation and shaping process, comprising the following components: 80-95 parts by weight of polymethyl methacrylate matrix resin, 5-20 parts by weight of isoborneol methacrylate, 2-6 parts by weight of nano-silica, 0.4-1.2 parts by weight of silane coupling agent, 0.2-0.6 parts by weight of initiator, 0.5-1.5 parts by weight of crosslinking agent, 0.1-0.4 parts by weight of antioxidant, 0.1-0.3 parts by weight of light stabilizer, and 0.05-0.2 parts by weight of release agent. By introducing isoborneol methacrylate as a comonomer into the polymethyl methacrylate matrix, the glass transition temperature of the polymer is significantly increased by utilizing the cyclic rigid groups in its molecular structure. Combined with the reinforcing effect of nano-silica, the high-temperature resistance of the acrylic sheet is significantly improved, with a heat distortion temperature and Vicat softening temperature significantly higher than those of ordinary acrylic sheets.

A plant for producing an ethylene polymer, the plant comprising a primary compressor and a secondary compressor with an outlet; a temperature adjusting system with an inlet and an outlet, the temperature adjusting system being in fluid communication with the secondary compressor outlet; a reaction system with an inlet in fluid communication with the outlet of the temperature adjusting system, the reaction system comprising a tubular reactor, wherein the tubular reactor has two or more reaction zones, wherein each reaction zone comprises i) a reaction section having an inside diameter and ii) a super cooler downstream and in direct fluid communication with the reaction section; and a controller configured to allow that a fluid has a residence time in the reaction section of no more than 60 seconds; wherein the tubular reactor is configured to operate at a pressure from 120 MPa to 350 MPa or higher; and wherein the super cooler comprises two or more parallel flow tubes having an inside diameter smaller than the inside diameter of the reaction section. And a process for producing an ethylene (co)polymer by polymerizing ethylene or, alternatively, ethylene and a comonomer, in a plant as defined above.

This invention relates to the field of metallocene linear low-density polyethylene (MDPE) preparation technology, and particularly to a method for preparing long-chain branched metallocene polyethylene. The method comprises the following steps: A polymerization reaction is carried out in a high-pressure stainless steel reactor. A metallocene catalyst is added to the reactor with dried alkane, followed by ethylene, comonomers, and hydrogen gas, which is then introduced into the reactor. A mixed solution of dichlorosilane-functionalized non-conjugated α,ω-dienes and white oil is then added to the reactor. After stabilizing the reaction for 12-72 hours, excess steam is introduced for hydrolysis. The mixture is stirred for 1-4 hours and then discharged to obtain long-chain branched metallocene polyethylene. This invention achieves controlled molecular structure with controlled long-chain branching content, resulting in a product with high branching degree, suitable branch length, and uniform distribution. This increases the number of branched active sites and their uniform distribution, leading to excellent mechanical properties and low haze.

This invention relates to a method for preparing polyacrylonitrile microchannels, comprising: mixing acrylonitrile with a comonomer and a photoinitiator in a reaction solvent, and passing the mixture into a microchannel reactor for polymerization under ultraviolet light irradiation to obtain polyacrylonitrile. Compared with the prior art, this invention eliminates the need for adding an azo initiator, saving costs; and the polymerization product leaves no azo initiator residue, avoiding the adverse effects of residual azo initiator on the quality of the spinning solution.

This invention relates to the field of high-performance fiber materials technology, and discloses a long-lasting, UV-resistant, and highly stable Kevlar fiber. Using para-aramid as a matrix, it incorporates in-situ copolymerized grafted bis(aminotriazine)-benzimidazole UV-stabilizing units, and its surface is covalently bonded with a CeO2-TiO2 composite nanolayer via a silane coupling agent. This results in excellent UV resistance and structural stability, with a UPF value of 50-100+, and a strength retention rate of ≥90% after 500 hours of xenon lamp aging. It also retains ultra-high strength, high modulus, and high-temperature resistance. The preparation method includes synthesizing the bis(aminotriazine)-benzimidazole comonomer, low-temperature polycondensation of this comonomer with p-phenylenediamine and terephthaloyl chloride to obtain a copolymer spinning solution, followed by dry-wet spinning, alkaline etching, composite sol-coating, and high-temperature curing to obtain the target fiber. This invention employs dual modification through internal copolymerization and surface coating, resulting in a simple process suitable for industrial production. The obtained fiber can be used in aerospace, defense, and outdoor protection applications requiring long-term UV exposure.

A polyethylene-based composition may include an ethylene-based copolymer produced from ethylene and one or more C3-C10 alpha olefin comonomers, wherein the ethylene-based copolymer has: a density ranging from 945 kg / m3 to 961 kg / m3 according to ASTM D792, a melt flow rate (MFR2) ranging from 0.5 g / 10 min to 3.0 g / 10 min according to ASTM D1238 at 190° C. / 2.16 kg, a molecular weight distribution (Mw / Mn) ranging from 3 to 25, and a stress exponent (SEx) ranging from 1.0 to 1.8.

This invention relates to the field of polymer material additives technology, and discloses a reactive ultraviolet composite stabilizer and its application in TPEE. The aim is to solve the problem that traditional physical blending light stabilizers are prone to migration and volatilization, leading to insufficient long-term weather resistance of polymers. This invention designs and synthesizes a composite stabilizer with primary hydroxyl groups retained at both ends of the molecule, using dibromoneopentyl glycol as the backbone and connecting its two ends of bromine atoms to hindered amine derivatives containing hydroxyl groups and triazine ultraviolet-absorbing derivatives via ether bonds. This stabilizer can be used as a comonomer, achieving permanent bonding and fixation during the polycondensation process of TPEE through the chemical embedding of its two primary hydroxyl groups into the polymer backbone. This allows it to exert non-migrating properties and the synergistic effect of the intramolecular hindered amine and ultraviolet-absorbing groups, thereby improving the anti-ultraviolet aging performance and long-term stability of TPEE products.

The application belongs to the field of admixtures, and particularly relates to a concrete thickening water-retaining agent and a preparation method and application thereof. The concrete thickening water-retaining agent is obtained by free radical polymerization reaction of an unsaturated acid monomer I, an unsaturated amide monomer, an unsaturated sulfonate monomer and a functional monomer; and the functional monomer is an esterification reaction product of rhamnolipid and an unsaturated acid monomer II. The key of the application is to introduce the esterification reaction product of rhamnolipid and the unsaturated acid monomer II as a copolymerization monomer into a copolymerization reaction system of the unsaturated acid monomer I, the unsaturated amide monomer and the unsaturated sulfonate monomer, so that the molecular structure of the concrete thickening water-retaining agent can be changed, the obtained concrete thickening water-retaining agent not only has excellent thickening and water-retaining properties, but also can improve the stability thereof in concrete.

The invention relates to the technical field of chemical anticorrosion pipeline materials, and discloses an application of a novel pipeline material in an anhydrous hydrogen fluoride device, the novel pipeline material is prepared from an ethylene monomer, an alpha olefin comonomer, rutile type nanometer titanium dioxide and anhydrous magnesium chloride, the anhydrous magnesium chloride is used as a carrier to load a titanium compound to form a polymerization catalyst, and the polymerization catalyst is used as a catalyst. The nano titanium dioxide is loaded on the surface of the rutile type nano titanium dioxide; the rutile type nano titanium dioxide is used as a polymerization core to construct bimodal molecular weight distribution, and the thermal conductivity of the rutile type nano titanium dioxide is utilized to induce the tube wall to form a gradient crystal structure with the crystallinity decreasing from the outer surface to the inner surface in the forming process. Through in-situ anchoring polymerization and gradient thermal history regulation and control, synergy of high barrier property, high strength and toughness and good processability of the material is realized, the problems of permeation, swelling, cracking and failure of a lining under the working condition of anhydrous hydrogen fluoride are solved, the service life of equipment is prolonged, and the production safety is improved.

Disclosed are extruded foam comprising an extruded thermoplastic, closed-cell foam having at least a first surface and comprising: (i) thermoplastic polymer cell walls formed by an extrusion step, with the walls being comprised of at least about 0.5% by weight of ethylene furanoate moieties and optionally one or more co-monomer moieties; (ii) blowing agent contained in at least a portion of said closed cells; and a material different than said thermoplastic, closed-cell foam attached to and / or integral with at least a portion of said first foam surface.

This application provides a method for preparing low-birefringence optical-grade polymethyl methacrylate (PMMA), belonging to the field of polymer material synthesis technology. To address the problems of high birefringence and insufficient thermal stability in existing PMMA materials, this method copolymerizes 80-95 parts by weight of PMMA, 2-20 parts by weight of a first comonomer, and 2-20 parts by weight of a second comonomer. The first comonomer is selected from phenyl methacrylate, etc., and the second comonomer is selected from isobornyl methacrylate, etc., with a mass ratio of 1:3 to 3:1. This method, by copolymerizing monomers in a specific ratio, can prepare materials with near-zero birefringence and high thermal stability, suitable for precision optics.

The application relates to the technical field of polyacrylonitrile polymer synthesis, in particular to a polyacrylonitrile polymer for modified functional fibers and a preparation method thereof. The polyacrylonitrile polymer comprises the following steps: first monomers and second monomers are added into a pipeline static mixer to be dispersed to obtain mixed material A; an emulsion system of a chain extender is prepared; water is added into a polymerization kettle, the water is heated to a set temperature, stirring is started, an oxidizing agent and a reducing agent are added in proportion, meanwhile, the mixed material A and the prepared emulsion system of the chain extender are added at 20-30 DEG C, the material stays in the kettle for 40-60 min, and a terminating agent is added to obtain slurry; the obtained slurry is put into a mixing tank, and then a polymer is obtained through centrifugation, water washing and drying. After being sufficiently dispersed through the pipeline static mixer, a copolymerization monomer is introduced, the monomer temperature is controlled, and a polyacrylonitrile with appropriate molecular weight and appropriate functional group quantity is prepared, and then an ion exchange fiber with excellent properties is prepared.

An extruded foam is disclosed, comprising an extruded thermoplastic closed-cell foam having at least a first surface and comprising: (i) a thermoplastic polymer pore wall formed by an extrusion step, the wall being composed of at least about 0.5% by weight of an ethylene furanoate portion and optionally one or more comonomer portions; (ii) a blowing agent contained in at least a portion of the closed cells; and a material different from the thermoplastic closed-cell foam, the material being attached to and / or integral with at least a portion of the first foam surface.