58 results about "Gradient copolymers" patented technology

The invention provides a method for preparing a gradient copolymer. In the method, based on the special chain transfer function and self-emulsification function of an amphiphilic reversible addition fragmentation chain transfer agent (amphiphilic RAFT reagent), under a condition of no emulsifier, the gradient copolymer is made from comonomer units by using a thermolysis initiator for initiation and water as a disperse phase and spontaneously by adopting a once feed method when the reactivity ratio of comonomers is high or forcefully by adopting a reaction material supply method when the polymerization reactivity ratio of the two comonomers is small. The molecular chain of the copolymer prepared by the method has a gradient, namely along a molecular chain, the leading position is gradually transferred from one monomer unit to the other monomer unit. The gradient copolymer is used in fields of gradient functional coatings, polymer bulking agents, damping materials and the like. The method is simple, low in cost and pollution free, and makes the control of a molecular chain structure and a polymerization process easy.

The invention relates to a lactide-epsilon-caprolactone copolymerization catalyst and a copolymerization method. The lactide-epsilon-caprolactone copolymerization catalyst relates to a nitrogenous bisphenol oxygen-based binuclear aluminum complex. The copolymerization method comprises the following steps of: adding lactide and epsilon-caprolactone into a reaction system sequentially or simultaneously, and carrying out copolymerization in a solvent-free system or an organic solvent medium under the catalysis of an appropriate of alcohol and nitrogenous bisphenol oxygen-based binuclear aluminum complex; and obtaining a lactide and epsilon-caprolactone copolymer through purifying after the copolymerization is finished. The high-efficiency lactide-epsilon-caprolactone copolymerization catalyst can realize synthesis of a lactide / epsilon-caprolactone segmented copolymer, a gradient copolymer, a wedge-shaped copolymer and a random copolymer. The lactide-epsilon-caprolactone copolymerization catalyst has very remarkably advantages of easily-obtained raw materials, simple polymerization method, various copolymer structures, regulating and controlling availability, higher catalysis activity and capabilities of obtaining the lactide and epsilon-caprolactone copolymer with high molecular weight and meeting requirements of the industrial department. A structural formula of the lactide-epsilon-caprolactone copolymerization catalyst is shown in a figure described in the specification.

The invention relates to a method for preparing an amphiphilic gradient copolymer by using special chain transfer function and self-emulsifying function of an amphiphilic RAFT (Reversible Addition Fragmentation chain Transfer) and adopting a thermal decomposition initiator for initiating without adding an emulsifying agent in a mixed dispersing medium with water as a main body through emulsifier-free emulsion polymerization. When the reactivity ratios of comonomers have large difference, a one-time feeding method is adopted to ensure that a monomer unit spontaneously forms a gradient copolymer; and when the reactivity ratios of comonomers have little difference, a feeding process of replenishing a hydrophobic monomer by adopting a micro sample introduction pump is utilized for forcedly forming the gradient copolymer. The amphiphilic gradient copolymer prepared in the method has a molecular chain with a gradient structure, and can be used in the fields of a macromolecule emulsifying agent, a cosmetic additive or coating dispersing agent; and a nano micelle prepared by the self-assembly of the amphiphilic gradient copolymer is applied to a biomedical vector. The method has the advantages of simple process, low cost and no pollution on environment, and is easy to control a molecular chain structure and a polymerization process.

The invention discloses a preparation method of an amphiphilic fluorine-containing gradient copolymer, and the method is used in oil-water separation ultrafiltration membrane antifouling modification. First, with a reversible addition fragmentation chain transfer (RAFT) controlled free radical polymerization method, with a semi-continuous feeding manner, an amphiphilic fluorine-containing gradient copolymer is prepared; the prepared amphiphilic fluorine-containing gradient copolymer is adopted as a modifying agent, and is used for modifying the ultrafiltration membrane with a blending modification method, wherein the membrane is prepared with a classic non-solvent induced phase transformation method. The surface of the membrane modified with the amphiphilic fluorine-containing gradient copolymer has an amphiphilic hierarchical structure with the coexistence of hydrophilic and hydrophobic regions. The amphiphilic fluorine-containing gradient copolymer preparation method is simple; and the modified membrane preparation process has the advantages of easy operation and mild conditions. The modified membrane has good oil-water separation performance and excellent antifouling effect, and can be used in water treatment and especially the separation purification of oil-containing wastewater.

The present invention relates to the field of tailored di-, tri- and multi-block as well as gradient polyesters / polycarbonates copolymers prepared by introducing monomers simultaneously in the reaction medium in the presence of an organometallic, metal salt or organic catalyst.

The invention relates to compositions containing two structured linear copolymers selected from the group consisting of block copolymers and gradient copolymers, said copolymers being produced according to differently controlled polymerization technologies and the difference of polydispersity of these copolymers being Delta(Mw / Mn) = 0.25. The invention also relates to the production of such mixtures and their use as wetting agents and dispersants.

The invention provides a preparation method for a polymeric nanometer microsphere. The preparation method comprises the following steps: with trithiocarbonate represented by a formula (I) as a chain transferring agent, carrying out RAFT living polymerization to synthesize a gradient copolymer; dissolving the gradient copolymer in an organic solvent and then adding water to form a polymeric micelle solution, wherein the organic solvent and water are intermiscible; and adding the polymeric micelle solution into an aqueous solution of an inorganic salt and carrying out solvent displacement so as to obtain the polymeric nanometer microsphere, wherein a volume ratio of the polymeric micelle solution to the aqueous solution of the inorganic salt is 0.01 to 1. The polymeric nanometer microsphere prepared by using the method has good stability and uniformity, narrow particle size distribution and photoresponse characteristics and the surface of the microsphere is rich in carboxyl groups, thereby facilitating application of the polymeric nanometer microsphere as a good carrier for drugs and proteins. Moreover, the method provided by the invention has the advantages of simpleness, easy practicability, good repeatability, low energy consumption, extensive applicability and easy realization of industrialization.

The invention concerns amphiphilic copolymers, in particular gradient amphiphilic copolymers obtained by controlled free radicval solution or mass polymerization. The invention also concerns a method for aqueous dissolution of said copolymers. The inventive copolymers are useful in surface treatment techniques and can be used in formulations for paints, adhesives, glues as well as in cosmetics.

The invention discloses a V-shaped gradient copolymer and a preparation process thereof. According to the copolymer and the preparation process, an emulsion polymerization system is used, a reversible addition fragmentation chain transfer free radical polymerization technology is adopted, a series of gradient copolymers in a V-shaped molecular chain structure are prepared through a step-by-step sectional charging method, and the series of gradient copolymers can serve as multi-shaped memory materials. According to the copolymer and the preparation process, devices are simple, the course is environmentally friendly and energy-saving, raw materials are cheap and easy to obtain, and the unique gradient copolymer has a good multi-shaped memory function, can serve as a high polymer material with the excellent performance and has broad application prospects in fields such as biological medicine, aerospace and mechanics and electronics.

The invention discloses a gradient function coating with surface tension changed in a gradient way, and the gradient function coating comprises the following components in percentage by weight: 5%-20% of polystyrene-b-polymethacrylic acid amphiphilic block polymers, 5%-35% of hydrophobic resin, 5%-40% of hydrophilic resin, 30%-80% of solvents, 0%-8% of pigment fillers and 0%-5% of auxiliary agents. The invention also discloses a preparation method of the gradient function coating. The gradient function coating with the surface tension changed in the gradient way, which is disclosed by the invention, is prepared under the condition that a synthetic process is simplified and the synthetic cost is reduced as far as possible by synthesizing a gradient copolymer, the hydrophilic resin and the hydrophobic resin and reasonably proportioning various coating components.

Provided are: an acrylic-based hot-melt adhesive that is superior in terms of both hot-melt coating characteristics and holding strength, is favorable for application in hot-melt coating methods that coat at a high speed at low temperatures, has superior transparency and weather resistance, and furthermore has superior adhesion at low temperatures; and a block copolymer favorable for use with respect to same. The present invention produces an adhesive containing a block copolymer having at least one structure represented by the general formula -[A1]-[B / A2]- (wherein: [A1] indicates a polymer block comprising a structural unit derived from a methacrylic ester (A1); [B / A2] indicates a copolymer block comprising a structural unit derived from an acrylic ester (B) and a structural unit derived from a methacrylic ester (A2); and the copolymer block [B / A2] has a gradient copolymer block section at which the copolymer ratio of the methacrylic ester (A2) continues to increase from the section of bonding to the copolymer block [A1]), having a total content of structural units derived from the methacrylic ester (A1) and the methacrylic ester (A2) of 5-60 mass%, having a weight average molecular weight (Mw) of 30,000-300,000, and having a molecular weight distribution (Mw / Mn) of 1.0-1.5.

The invention relates to a preparation method of an amphiphilic gradient copolymer self-assembled in-situ composite silver nanoparticle, which is a preparation method of an in-situ composite nanoparticle taking an amphiphilic gradient copolymer as the shell and a silver nanoparticle as the core. The preparation method comprises the following specific steps: dispersing a hydrophilic silver nanoparticle in an amphiphilic gradient copolymer solution, and performing solvent induction to form the amphiphilic gradient copolymer into micelle through self assembling; and at the same time of forming the micelle, performing surface hydrophobicity modification on the silver nanoparticle with hydrophobic modifier, and ensuring that the silver nanoparticle optionally moves into the hydrophobic inner core of the polymer micelle under hydrophobic action, thus obtaining the composite nanoparticle taking the amphiphilic gradient copolymer as the shell and the silver nanoparticle as the core. The composite nanoparticle prepared by the invention is high in stability, simple in preparation process, mild in preparation conditions and easy to control, and can be used in the fields of electronics, optics and catalysts.

The invention discloses a gradient copolymer and its preparation method and application. The gradient copolymer comprises n polymer components or is composed of the n polymer components. The n polymercomponents independently represent addition polymers of a monomer shown in the formula (I) and / or their mixture or the n polymer components independently comprise one or more of structural units shown in the formula (I-1) or are composed of one or more of the structural units shown in the formula (I-1). The n represents an integer in the closed interval [5, infinity]. The ith polymer component has the side chain average carbon atom number Xi detected by a nuclear magnetic resonance method, the symbol i represents an integer from 1 to n and the relational expression is X1<X2<...<Xn-1<Xn. The gradient copolymer has excellent lubricating oil depressing efficacy or wide base oil depressing adaptability. In the formula (I) or formula (I-1), the groups and values are defined in the specification.

An adhesive containing a block copolymer having at least one structure represented by formula: -[A1]-[B / A2]-, where [A1] represents a polymer block composed of a structural unit derived from a methacrylic acid ester (A1), [B / A2] represents a copolymer block composed of a structural unit derived from an acrylic acid ester (B) and a structural unit derived from a methacrylic acid ester (A2), and the copolymer block [B / A2] has a gradient copolymer block section in which a copolymerization ratio of the methacrylic acid ester (A2) continuously increases from a section connected to the polymer block [A1]. The block copolymer has a total content of the structural units derived from the methacrylic acid ester (A1) and the methacrylic acid ester (A2) of 5% to 60% by mass, a weight-average molecular weight (Mw) of 30,000 to 300,000, and a molecular weight distribution (Mw / Mn) of 1.0 to 1.5.

Provided are an acrylic hot-melt adhesive that has both good hot-melt processability and good holding power, that is suitable for applications to a hot-melt coating method in which coating is performed at a low temperature at a high speed, that has good transparency and good weather resistance, and that further has good adhesiveness at low temperatures, and a block copolymer suitable for use in the adhesive. Prepared is an adhesive containing a block copolymer having at least one structure represented by a general formula: -[A1]-[B / A2]- (where, in the formula, [A1] represents a polymer block composed of a structural unit derived from a methacrylic acid ester (A1), [B / A2] represents a copolymer block composed of a structural unit derived from an acrylic acid ester (B) and a structural unit derived from a methacrylic acid ester (A2), and the copolymer block [B / A2] has a gradient copolymer block section in which a copolymerization ratio of the methacrylic acid ester (A2) continuously increases from a section connected to the polymer block [A1]), and having a total content of the structural units derived from the methacrylic acid ester (A1) and the methacrylic acid ester (A2) of 5% to 60% by mass, a weight-average molecular weight (Mw) of 30,000 to 300,000, and a molecular weight distribution (Mw / Mn) of 1.0 to 1.5.

A hair-cosmetic composition comprising, in a cosmetically acceptable medium, at least one film-forming gradient copolymer comprising at least two different monomeric residues, and displaying a mass polydispersity index (Ip) less than or equal to 2.5, wherein the composition is able to form a film that has a strain at break epsilonr ranging from 5% to 2500%, and / or a Young's modulus ranging from 0.5 to 1200 Mpa, and / or an instantaneous elastic recovery epsiloni greater than or equal to 10%. An aerosol composition packaged in an aerosol device, comprising a propellant and a haircare composition as defined above, and also a method for treating the hair, such as a styling method, comprising applying the haircare composition or the aerosol composition above to the hair.

The invention provides a gasoline engine lubricating oil composition and a preparation method thereof. The gasoline engine lubricating oil composition is prepared from the following components: a gradient copolymer, a viscosity index modifier, a dispersant, a cleaning agent, zinc dialkyl dithiophosphate, dialkyl dithiocarbamate and / or dialkyl dithiocarbamate, an antioxidant, a friction modifier and lubricant base oil. The gasoline engine lubricating oil composition has the phosphorus content with the mass fraction being not more than 0.08%, has very excellent low-temperature performance and antioxidant performance, and can meet the requirements of SM / GF-4 and SN / GF-5 high-grade gasoline engine lubricating oil.

The invention provides a diesel engine lubricating oil composition and a preparation method thereof. The diesel engine lubricating oil composition is prepared from a gradient copolymer, a viscosity index improver, a dispersant, a clearing agent, zinc dialkyl dithiophosphate, an antioxidant and a base lubricating oil. The diesel engine lubricating oil composition has very excellent low temperatureperformance and anti-oxygen performance, and can meet the requirements of high-grade diesel engine lubricating oil at the CI-4 level or above.

The invention discloses a multifunctional polycarboxylate water-reducer containing a gradient polymer side chain and a preparation method of the multifunctional polycarboxylate water-reducer. An ATRPmixing one-step method is utilized to synthesize a polyvinylpyrrolidone (PVP) and poly(methyl) acrylic acid gradient copolymer active macromonomer; aqueous solution free radical copolymerization is carried out on the macromonomer, (methyl)acrylic acid and a PEG active macromonomer; the polycarboxylate water-reducer with PEG and the PVP and poly(methyl) acrylic acid gradient copolymer as side chains is synthesized; a special comb-shaped structure of the water-reducer endows the water-reducer with good adsorption, dispersion, water reduction, slump loss resistance, suspension and emulsificationproperties, and the water-reducer is a multifunctional polycarboxylate water-reducer with excellent performance.

A gradient copolymer comprises or consists of n polymer components. The n polymer components each independently represents an addition polymer of a monomer of the formula (I),and / or a mixture thereof, orthe n polymer components each independently comprises or consists essential of one or more structural units represented by the formula (I-1),The symbol n represents an integer within the closed interval [5, ∞]. The average side chain carbon number of the i-th polymer component as determined according to the nuclear magnetic resonance method is expressed as Xi, with the symbol i representing an arbitrary integer from 1 to n, the relationship X1<X2< . . . <Xn−1<Xn holds.

The present invention relates to a process for the perpendicular orientation of nanodomains of block copolymers on a substrate by using a sublayer of random or gradient copolymers whose monomers differ at least in part from those present, respectively, in each of the blocks of the block copolymer.

The invention discloses a multi-layer composite pipe as well as a preparation method and application thereof, and relates to the technical field of plastic pipelines. The multi-layer composite pipe sequentially comprises an anti-freezing outer layer, a bonding layer and a pressure-bearing inner layer from outside to inside, and the anti-freezing outer layer comprises PPR; nanoparticles; an elastic body; the bonding layer comprises a gradient copolymer, and preparation raw materials of the gradient copolymer comprise PP, PE and a silane coupling agent; the gradient copolymer sequentially comprises a first gradient layer, a second gradient layer and a third gradient layer in the thickness direction of the bonding layer, the mass ratio of PP to PE in the first gradient layer is 7: 3-8: 2, the mass ratio of PP to PE in the second gradient layer is 4: 6-5: 5, and the mass ratio of PP to PE in the third gradient layer is 2: 8-3: 7; and the pressure-bearing inner layer comprises PERT and peroxide. The multi-layer composite pipe provided by the invention has excellent frost crack resistance and long-term hydrostatic stability.

The present disclosure relates to a nail varnish composition comprising at least one film-forming gradient copolymer exhibiting a mass polydispersity index (PI) of less than or equal to 2.5, the said composition being capable of forming a film exhibiting a rate of loss of weight of less than 1 mg / minute when the film is subjected to abrasion produced with the Taber abrasion tester at 23 DEG C. The invention also relates to a cosmetic process for making up or caring for the nails.

The invention discloses a polyamine-polyester gradient copolymer, aziridinyl cationic polyester as well as a preparation method and application of the aziridinyl cationic polyester, relates to the technical field of high polymer material synthesis, and solves the problems of complex synthesis process, high cost and cytotoxicity caused by concentrated amino distribution of the current cationic polyester material. The preparation method comprises the following steps: mixing a catalyst, a promoter, N-o-nitrobenzenesulfonyl substituted methyl aziridine, cyclic anhydride and alicyclic epoxide under anhydrous and anaerobic conditions, carrying out ring-opening copolymerization reaction, and after the reaction is finished, settling to obtain the polyamine-polyester gradient copolymer. Dissolving the polyamine-polyester gradient copolymer in ultra-dry DMF under the protection of nitrogen, then adding potassium carbonate and p-tolylthiophenol, after a desulfonylation reaction is finished, settling and washing in diethyl ether, and finally performing vacuum drying to obtain the aziridinyl cationic polyester. The method is beneficial to promoting the development of polyester functionalization, and has potential application value in the fields of gene transfection, protein carriers and sewage treatment, CO2 adsorption, adhesives and the like.

The present invention relates to the field of tailored di-, tri- and multi-block as well as gradient polyesters / polycarbonates copolymers prepared by introducing monomers simultaneously in the reaction medium in the presence of an organometallic, metal salt or organic catalyst.

The invention relates to the technical field of lithium ion batteries, and particularly provides a gradient copolymer, a preparation method and application thereof, an adhesive, a negative pole piece and a lithium ion battery. The gradient copolymer provided by the invention comprises a repeating unit A generated by polymerization of at least one monomer A, a homopolymer corresponding to the monomer A has a glass transition temperature Tg1 of not less than 100 DEG C, and the number-average molecular weight of the homopolymer corresponding to the monomer A is 100,000-500,000; a repeating unit B resulting from the polymerization of at least one monomer B, the corresponding homopolymer of the monomer B exhibiting a glass transition temperature Tg2 of not more than 80 DEG C, and the number average molecular weight of the corresponding homopolymer of the monomer B being 100,000-500,000; the repeating unit A and the repeating unit B are connected through a carbon-carbon single bond. When the gradient copolymer disclosed by the invention is used as a negative electrode adhesive, the volume expansion stress release of graphite in the circulation process is more relaxed and progressive, and the cycle performance of a battery cell can be better improved.

The invention discloses an open click-free radical one-pot method taking copper thioxanthone carboxylate as photocatalyst and deoxidant. The open click-free radical one-pot method comprises the following steps: taking the copper thioxanthone carboxylate (CU(TX)2) as the photocatalyst and the deoxidant; reducing Cu(II) in a system into Cu(I) in situ under the irradiation of sunlight; meanwhile, catalyzing ATRP (Atom Transfer Radical Polymerization) and click reaction to prepare a sequence controllable gradient copolymer. According to the method disclosed by the invention, controllable polymerization can be realized without the need of adding a ligand, so that an experiment process is greatly simplified; the sunlight is used as a light source so that energy sources are greatly saved.

The invention provides a gasoline engine lubricating oil composition and a preparation method thereof. The gasoline engine lubricating oil composition of the present invention comprises gradient copolymer, viscosity index improver, dispersant, detergent, zinc dialkyldithiophosphate, dialkyldithiocarbamate and / or dioxane Dithiocarbamates, antioxidants, friction modifiers and lubricant base stocks. The composition of the invention has a phosphorus content of not more than 0.08% by mass fraction, has excellent low-temperature performance and anti-oxidation performance, and can meet the requirements of SM / GF-4 and SN / GF-5 high-grade gasoline engine lubricating oils.

The invention relates to a polyether-polysiloxane copolymer that is a gradient copolymer; a two-component (2K) composition comprising at least one component (I) and at least one component (II), wherein component (I) comprises at least one compound having at least one hydroxyl group-reactive functionality, and component (II) comprises a hydroxyl-functionalized polyether-polysiloxane copolymer according to the invention; methods for producing a polyether-polysiloxane copolymer according to the invention, wherein a mixture of at least one alkylene oxide and at least one siloxane is polymerized in the presence of a Double Metal Cyanide (DMC) catalyst and use of the polyether-polysiloxane copolymer according to the invention, a two-component (2K) composition according to the invention or copolymers obtainable by a method of according to the invention as a reactive component for coating, sealant or adhesive compositions based on active hydrogen reactive compounds.