39 results about "Precipitation polymerization" patented technology

This invention relates to an aqueous binder for lithium-ion battery negative electrodes, its preparation method, and its application. The raw materials for the aqueous binder include unsaturated carboxylic acid monomers, unsaturated nitrile monomers, unsaturated amide monomers, acrylate monomers, and functional monomers. The functional monomers include at least one selected from hydroxyethyl acrylate, hydroxyethyl methacrylate, methoxy polyethylene glycol acrylate, allyl polyethylene glycol, and allyl polyethylene glycol monomethyl ether. The aqueous binder of this invention incorporates acrylate monomers and functional monomers, which can lower the glass transition temperature of the copolymer while maintaining high peel strength. By introducing functional monomers with long side chains, the double-layer mechanism of polyacrylic acid itself and the steric hindrance effect of the long side bonds of the functional monomers are utilized as dispersants to achieve stable dispersion of the negative electrode slurry particles. The precipitation polymerization method can significantly reduce the internal resistance of lithium-ion batteries and improve peel strength.

The application relates to the technical field of polyolefins, and discloses a coordination precipitation polymerization method for olefin polymerization and a polyolefin, the method comprising mixing olefin monomers, a catalyst and an additive, and performing a polymerization reaction; the olefin monomers contain nonpolar monomers and polar monomers, the nonpolar monomers are selected from one or more than two of ethylene, alpha-olefins and internal olefins, and the polar monomers are selected from one or more than two of enol, unsaturated carboxylic acids and unsaturated carboxylic acid esters; and the catalyst is selected from a post-transition metal complex shown in formula (I). The application can eliminate the catalyst loading process, realize olefin homogeneous catalyst polymerization self-forming, and prepare polyolefins with good particle morphology.

This invention belongs to the field of polymerization reactions and discloses a reaction system and method for the precipitation polymerization of α-olefins with maleic anhydride. The system includes a reaction circulation subsystem and an external circulation temperature control subsystem. The reaction circulation subsystem includes a reaction vessel, a reactor, a reaction circulation pump, and a mixing connection device. The reaction vessel includes a vessel body, a jacket, a stirring device, and a first non-condensable gas outlet. The reactor includes a reaction liquid chamber, an external circulation liquid chamber, and a second non-condensable gas outlet. The external circulation liquid chamber is arranged around the outside of the reaction liquid chamber and is not connected to it. The external circulation temperature control subsystem includes an external circulation buffer tank, an external circulation pump, an external circulation heater, and an external circulation cooler. This invention, through a segmented reaction system, separates the heating and cooling functions of the reaction vessel, meeting the heating and cooling requirements of the precipitation polymerization of α-olefins with maleic anhydride in different solvent systems at different reaction stages.

The application belongs to the field of water pollution control, and discloses a preparation method and application of a flexible imprint MOFs catalyst capable of being magnetically recycled. A core-shell structure flexible imprint catalyst is synthesized by adopting a precipitation polymerization method with a magnetic Fe-MOF as a base. The catalyst has multi-target adsorption characteristics, can simultaneously and quickly target capture various sulfonamide organic matters in water, realizes efficient targeted degradation of sulfonamide organic pollutants in water, has the characteristics of magnetic recovery, can be quickly separated from the solution by an external magnetic field to realize efficient recovery and reuse of the catalyst, conforms to the green environmental protection concept, and has a good engineering application prospect.

The invention relates to a method for producing a thermoplastic polyurethane powder by means of precipitation polymerisation. The method comprises i) providing a solvent mixture which contains at least one first aprotic solvent A1 having a relative permittivity εr between 2 and 20 (at 20 °C and 100 kHz) and a second aprotic polar solvent A2 from the group 1,2-propylene carbonate, gamma-butyrolactone or ethylene carbonate; ii) adding a polyol B having a molecular mass between 60 g / mol and 250 g / mol and a diisocyanate C; iii) reacting B and C in the solvent mixture A at a temperature of at most 150 °C, wherein the resulting polyurethane precipitates as a solid and forms a dispersion; iv) separating the solvent, washing the solid and drying to give the powder. The resulting powder has a molecular mass Mw of ≥ 35000 g / mol, an allophanate content of < 0.25 mol % and a proportion of > 25.0% of particles < 0.500 mm and satisfies a Mz : Mw ratio of < 4.0.

The invention provides a preparation method of a flatulence slow-rebound foam composition. The preparation method comprises the following steps: with isocyanate as a unique monomer, preparing linear polyurea microspheres in a reaction medium by using a precipitation polymerization method; adding a multifunctional amine cross-linking agent and polyether amine, and supplementing similar isocyanate, so that the surface of the polyurea microsphere is subjected to a cross-linking reaction to obtain a polyurea core-shell microsphere with a linear core and a cross-linked shell; and dissolving out the inner core of the polyurea core-shell microsphere to obtain the porous hollow polyurea microsphere. The microspheres prepared by the method are good in flatulence effect, and the flatulence slow-rebound foam composition is excellent in air permeability and mechanical property.

The present invention relates to hybrid polymers obtained by a free radical precipitation polymerization method from at least one monomer containing at least one unsaturated ethylenic functional group in the presence of at least one protein. The present invention also relates to the use of said hybrid polymers as thickeners in various formulations or compositions.

A solvent-based plastic recycling method that removes color and produces plastic polymers substantially free of exogenous colorants. The method comprises selecting a solvent that selectively dissolves an individual polymer and has low solubility of colorants and decomposition products of the colorants. A combined precipitator and piston device is used to precipitate the polymer solution and mechanically remove the solvent from the precipitate before thermal drying. An adsorption bed is used to clean the recovered solvent as it is recycled to the process.

This invention relates to the field of polyolefin technology, and discloses a coordination precipitation polymerization method for olefin polymerization and a polyolefin thereof. The method includes mixing olefin monomers, a catalyst, and an auxiliary agent to carry out a polymerization reaction; the olefin monomers contain nonpolar monomers and polar monomers; the nonpolar monomers are selected from one or more of ethylene, α-olefins, and internal olefins; the polar monomers are selected from one or more of enols, unsaturated carboxylic acids, and unsaturated carboxylic acid esters; the catalyst is selected from a post-transition metal complex of formula (I). This invention eliminates the need for catalyst loading in the process, achieves self-forming polymerization of olefins using homogeneous catalysts, and prepares polyolefins with good particulate morphology.

This invention relates to a polyamide 6 microsphere and its preparation method. The preparation method of the polyamide 6 microsphere includes: melting caprolactam, adding an initiator and reacting at 120-130 °C for 10-30 min; then adding a solvent consisting of a mixture of hydrocarbons and high-boiling-point ethers in a volume ratio of 1:9 to 9:1; adding an appropriate amount of dehydrating agent and an appropriate amount of activating agent; and reacting at 135-150 °C for 20-90 min to obtain polyamide 6 microspheres. This invention uses hydrocarbons and high-boiling-point ethers as a mixed solvent and employs precipitation polymerization without solvent etching to directly prepare spherical, narrowly distributed, high-purity, and controllable-size polyamide 6 microspheres. This meets the high-performance application requirements of 3D printing, bioseparation, and high-end coatings, which are unattainable by traditional methods. Furthermore, the mixed solvent used in the preparation process can be recycled and reused.

The application discloses a preparation method of a hydrophobic H-SiO2@PNIPAM hybrid microgel stabilized phase inversion type Pickering emulsion and application thereof, and relates to the technical field of nanometer material preparation and biological culture. The application prepares the surface hydrophobic H-SiO2@PNIPAM hybrid microgel particles through a precipitation polymerization method and a sol-gel reaction, then uses the hybrid microgel as an emulsifier to stabilize a W / O type Pickering emulsion, can encapsulate the obligate anaerobe bifidobacterium in the inner part of the emulsion droplets, and realizes efficient culture. The hybrid microgel prepared in the application has strong hydrophobicity, and meanwhile, the temperature sensitivity of the PNIPAM core is reserved, so that the Pickering emulsion stabilized by the hybrid microgel also has temperature sensitivity, and the emulsion can be phase-inverted only by temperature change, so that the inner phase bacteria are released, and rapid separation is realized. Compared with the conventional anaerobe culture method, the method disclosed by the application can realize efficient culture and rapid separation of the bacteria after culture, and has a good application prospect.

The application relates to the technical field of polyolefins, and discloses a coordination precipitation polymerization method for olefin polymerization and a polyolefin, the method comprising mixing olefin monomers, a catalyst and an additive, and performing a polymerization reaction; the olefin monomers contain nonpolar monomers and polar monomers; the nonpolar monomers are selected from one or more than two of ethylene, alpha-olefins and internal olefins; the polar monomers are selected from one or more than two of enol, unsaturated carboxylic acids and unsaturated carboxylic acid esters; and the catalyst is selected from a single-metallocene pre-transition metal complex shown in formula (I). The application can eliminate the catalyst loading process, realize olefin homogeneous catalyst polymerization self-forming, and prepare polyolefins with good particle morphology.

The application provides a monodisperse functionalized polymer magnetic composite microsphere and belongs to the technical field of magnetic materials. The monodisperse polystyrene microsphere is prepared by using a dispersion polymerization method, a two-step swelling method is used to obtain porous crosslinked polystyrene microspheres, then the porous crosslinked polystyrene microspheres are mixed with sulfuric acid to obtain porous polystyrene microspheres containing sulfonic acid groups on the surface, then the in-situ precipitation method is used to combine with ferrous ions, in an alkaline environment, the magnetic porous polystyrene microspheres are obtained, finally in acetonitrile solvent, various functional monomers are added to obtain the monodisperse functionalized magnetic composite microspheres which have good suspension performance and fast magnetic attraction rate.

The invention discloses a preparation method of small-particle-size functionalized polymer microspheres, and belongs to the technical field of polymer preparation. The small-particle-size functionalized polymer microspheres are prepared by taking hydrophilic polyethylene glycol diacrylate or polyethylene glycol dimethacrylate as a cross-linking agent and adopting a self-stabilizing precipitation polymerization reaction. The copolymerization reaction system is composed of an electron donating monomer, an electron accepting monomer and a polyethylene glycol diacrylate or polyethylene glycol dimethacrylate hydrophilic crosslinking monomer; and after the polymerization reaction is finished, separating the narrow-distribution functionalized polymer micro-nano particles from the reaction system in a centrifugation or filtration manner. The prepared polymer microspheres are uniform in size, controllable and small in particle size, good in hydrophilicity, excellent in specific adsorption resistance and high in functional group content, and have wide application prospects in the fields of adsorption, separation, drug loading, controlled release, catalysis and the like.

The invention relates to a method for producing a thermoplastic polyurethane powder by means of precipitation polymerisation, comprising the steps of: i. providing A) a solvent; B) at least one polyol having a molar mass between 60 g / mol and 250 g / mol; C) at least one diisocyanate; D) a catalyst, wherein the catalyst comprises or consists of a titanium, zinc or zirconium transition metal complex or mixtures thereof; E) optionally a chain transfer agent E1) and / or an additive E2); ii. reacting the polyol B) with the diisocyanate C) in the solvent A) at a temperature of at most 150 °C in the presence of the catalyst D), optionally the chain transfer agent E1) and / or the additive E2), to form the thermoplastic polyurethane, wherein the thermoplastic polyurethane precipitates as a solid in the solvent A) and forms a dispersion; iii. separating the solvent A) and optionally washing the thermoplastic polyurethane with a solvent; and iv. drying the thermoplastic polyurethane to give the thermoplastic polyurethane powder; wherein the thermoplastic polyurethane powder has a mass-average molar mass Mw of ≥ 50000 g / mol; an allophanate content of ≤ 0.25 mol %, in relation to the total thermoplastic polyurethane powder; and a ratio of z-average molar mass Mz to mass-average molar mass Mw of ≤ 4.0, where the mass-average molar mass Mw, the allophanate content and the z-average molar mass Mz are each determined by the methods set out in the description.

In an aspect, a method of making a composition, comprising forming a solvent mixture comprising a polymer and a solvent; precipitating the solvent mixture with a non-solvent to form the composition comprising the filler in a fibrillated polymer matrix, wherein the composition is in the form of a particulate and at least one of the solvent and the non-solvent comprises a filler; and separating the composition from the solvent and the non-solvent to isolate the composition. In another aspect, a porous material wherein the filler particles are mechanically bonded together by the polymer and wherein the polymer is present as filaments adhering to and connecting the filler particles across interstitial spaces between the filler particles. In another aspect, a precipitated polymer solution produced by a phase inversion where the majority of the liquids can be mechanically removed.

This application discloses a microsphere containing ultrastable core-shell heterostructure nanocrystals and its preparation method, belonging to the field of perovskite luminescence. It utilizes an S-Zn complex formed by octetranilol and zinc acetate dihydrate to passivate the Pb content on the surface of CsPbBr3 nanocrystals. 2+ Active site, Zn 2+ Doping improves lattice matching and enhances the fluorescence quantum yield of nanocrystals. The CsPbBr3 crystal phase on the nanocrystal surface undergoes a phase transition to Cs4PbBr6 under the synergistic effect of octylthiol and zinc acetate dihydrate, forming an ultrastable core-shell heterostructure. Composite microspheres of S-Zn@CsPbBr3 nanocrystals supported on polymethyl methacrylate (PMMA) were synthesized. The S-Zn@CsPbBr3@PMMA microspheres were constructed by precipitation polymerization of S-Zn@CsPbBr3 nanocrystals and methyl methacrylate prepolymer in n-hexane. The physical barrier effect of the PMMA matrix enhances the stability of the S-Zn@CsPbBr3 nanocrystals.

The application belongs to the technical field of electromagnetic wave absorbing materials, and discloses a surface topological carbon micro-nano material and a preparation method and application thereof.The preparation method comprises the following steps: mixing acrylonitrile, a first carbon-carbon double bond unsaturated monomer, a first solvent and a first initiator, performing a precipitation polymerization reaction, and obtaining a first powder; mixing the first powder, a second solvent, a second carbon-carbon double bond unsaturated monomer and a second initiator, performing a seed polymerization reaction, and obtaining a carbon microsphere precursor powder; the carbon microsphere precursor powder is pre-oxidized, and then carbonized under a protective atmosphere to obtain the surface topological carbon micro-nano material.The application controls the morphology, particle size and composition by changing the type and amount of monomers, the type and proportion of solvents, and obtains the surface topological carbon micro-nano material with different compositions, morphologies and carbonization degrees after carbonization, the minimum reflection loss of which is-37.5 to-48.7 dB, and the effective absorption bandwidth is 3.8 to 6.1 GHz.

This invention discloses Co-Fe based on a coordination-driven triple doping strategy. 1‑x S@N,S-C composite materials, their preparation methods, and applications. This material, prepared via coordination precipitation-polymerization-carbonization, exhibits a unique honeycomb porous structure, with cobalt-doped Fe as its core. 1‑x S is coated with a nitrogen- and sulfur-doped carbon layer. This triple-doped structure induces Fe through Co doping. 1‑x The sulfur lattice generates sulfur vacancies, significantly enhancing the Na content. + The material exhibits strong adsorption and diffusion capabilities; simultaneously, the N and S co-doped carbon layer not only enhances electronic conductivity but also effectively anchors polysulfides through strongly polar C-S and C-N bonds, forming a strong interfacial coupling with the active core to synergistically buffer volume expansion. When used as an anode in sodium-ion batteries, this material demonstrates high reversible capacity, excellent rate performance, and ultra-long cycle life. When paired with a Na3V2(PO4)3@C cathode to assemble a full cell, the energy density reaches as high as 228 Wh / kg. ‑1 It has broad application prospects.

This invention discloses a furfuryl alcohol copolymer-coated ammonium polyphosphate and its application in the preparation of flame-retardant composite materials, belonging to the field of flame-retardant materials technology. The invention involves mixing furfuryl alcohol, electron-accepting monomers, crosslinking agents, and initiators with ammonium polyphosphate in a solution, causing furfuryl alcohol, electron-accepting monomers, and crosslinking monomers to precipitate and polymerize on the surface of the ammonium polyphosphate, forming a furfuryl alcohol copolymer-coated ammonium polyphosphate. This furfuryl alcohol copolymer-coated ammonium polyphosphate, as a flame retardant, can be compounded with polyurethane foam, thermoplastic polymers, and thermosetting polymers to prepare polyurethane foam flame-retardant composite materials, thermoplastic flame-retardant polymer composite materials, and thermosetting flame-retardant polymer composite materials, respectively. The furfuryl alcohol copolymer-coated ammonium polyphosphate exhibits good dispersibility in the polymer matrix, good interfacial compatibility, and is easily modified, significantly improving the flame-retardant properties of the composite material while maintaining its excellent mechanical properties.

The invention discloses doxifluridine-containing nanoparticles as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a doxifluridine derivative containing a methacrylate group by utilizing a reaction between methacrylic anhydride and doxifluridine; and (2) by using a precipitation polymerization method, taking acrylic acid and the deoxyfluridine derivative containing the methacrylate group as monomers, and copolymerizing to form nano-particles. The obtained nano-particles are uniform in particle size and good in dispersity, have certain anti-tumor capacity, can be used for entrapping other anti-tumor drugs to achieve the purpose of combined drug delivery, and have good application prospects in the aspect of drug delivery.

The invention discloses a preparation method of a carbon-based microsphere with a porous structure, which comprises the following steps: S1, mixing a styrene monomer and an acrylonitrile monomer in proportion to form a mixed monomer solution; s2, adding the mixed monomer solution into a mixed solvent composed of ethanol and deionized water, and fully stirring to form a liquid mixing system for precipitation polymerization reaction; s3, adding polyvinylpyrrolidone used as a stabilizer and azodiisobutyronitrile used as an initiator into the liquid mixing system; s4, under the protection of inert gas, heating the liquid mixing system to a reaction temperature interval, and continuously carrying out precipitation polymerization reaction in the temperature interval to obtain styrene-acrylonitrile copolymer microspheres; and S5, under the protection of inert gas, carrying out high-temperature carbonization on the styrene-acrylonitrile copolymer microspheres to decompose acrylonitrile and the stabilizer, and generating a hierarchical porous structure in which micropores and mesopores coexist in situ, so as to obtain the carbon-based microspheres with the porous structure.

The present application belongs to the field of polymer, and discloses a preparation method of lithium ion battery negative electrode binder. In an organic phase, monomers are used to carry out a precipitation polymerization reaction in the presence of an initiator, a dispersant and a crosslinking agent, so as to obtain the lithium ion battery negative electrode binder. Compared with an oily binder, the negative electrode binder of the present application is in the form of powder. In order to improve the water dispersibility of the binder, a certain hydrophobic group needs to be introduced between polymer molecular chains, so as to prevent the phenomenon that the polymer forms a dense hydration layer too quickly after contacting with water, thereby preventing water from further entering the interior of the polymer particles.

The invention provides a composition for preparing a polyacrylonitrile copolymer, the polyacrylonitrile copolymer as well as a preparation method and application of the polyacrylonitrile copolymer. The composition for preparing the polyacrylonitrile copolymer comprises a monomer 1 as shown in a formula I and a monomer 2 as shown in a formula II. The composition for preparing the polyacrylonitrile copolymer provided by the invention comprises a series of halogen-free flame-retardant phosphorus-containing monomers 1, the halogen-free flame-retardant phosphorus-containing monomers 1 are used for replacing an existing halogen-containing flame retardant to carry out copolymerization modification on polyacrylonitrile, and the obtained polyacrylonitrile copolymer is a real environment-friendly green high polymer material. Meanwhile, the method provided by the invention adopts water-phase precipitation polymerization commonly used in industry, and the synthesis process is simple, so that the pressure of subsequent recovery and the transformation cost are reduced, and the industrialization of the product is facilitated.

The invention relates to the technical field of fluorescence sensing detection, in particular to a molecularly imprinted ratiometric fluorescence sensor which comprises a response signal assembly and a reference signal assembly, the response signal assembly is molecularly imprinted polymers (MIPs) loaded with 7-hydroxycoumarin, and the reference signal assembly is CdTe-coated SiO2 quantum dots; the molecularly imprinted polymer is prepared by taking isopropyl methanesulfonate as a template molecule, ethylene glycol dimethacrylate (EDGMA) as a cross-linking agent and azodiisobutyronitrile (AIBN) as an initiator through a precipitation polymerization method. The defect that a single-emission fluorescence sensor is easily influenced by background noise, instrument fluctuation and environmental factors is effectively avoided, and the detection accuracy and reliability are improved.

The present application relates to the technical field of polyacrylonitrile-based carbon fiber, and provides an ammoniation method of polyacrylonitrile powder.The carboxyl-containing polyacrylonitrile slurry obtained by precipitation polymerization is first dried after being separated from single fibers to obtain carboxyl-containing polyacrylonitrile powder; the carboxyl-containing polyacrylonitrile powder is soaked in an aqueous solution of an ammoniation reagent to perform ammoniation; and the ammoniation reagent is an ammonium salt.The present application starts from the source of the spinning solution, and ammoniates the polyacrylonitrile powder after being separated from single fibers before preparing the spinning solution, so that the operation is simple, the ammoniation efficiency is high, and the hydrophilicity of the polyacrylonitrile can be effectively improved; furthermore, the ammoniation reagent used in the present application overcomes the shortcomings of common liquid amine and gaseous ammonia, such as strong odor and high toxicity, and the system after ammoniation is pure and friendly to the environment; further, the specific ammoniation reagent used in the present application does not introduce impurity elements into the system, and avoids the influence of impurities generated in the later pre-oxidation and carbonization on the performance of the final carbon fiber.

The invention relates to a specific composite membrane as well as a preparation method and application thereof, and the preparation method comprises the following steps: preparing a specific adsorption particle solution by adopting a precipitation polymerization method, dissolving the specific adsorption particle solution in a membrane preparation solution, and constructing the composite membrane with dual functions of specific adsorption and filtration by adopting a phase inversion method, a spinning method or a stretching method. According to the composite membrane prepared by the preparation method disclosed by the invention, the specific particles can be distributed on the surface layer of the membrane and can be loaded in the porous layer of the membrane, and the porous layer has more loading capacity than the surface layer, so that the composite membrane has the advantages of high loading capacity of the particles in the membrane and high adsorption capacity of the membrane to target ions. The specific composite membrane can be well suitable for removing and / or detecting ions in the environment, industrial and agricultural wastewater or food.

The application relates to the field of pouring sealant, and discloses a modified epoxy resin pouring sealant and a preparation method thereof. The pouring sealant comprises an epoxy resin, modified inorganic fillers, modified additives and an auxiliary agent. The modified inorganic fillers are prepared by grafting quaternary ammonium s-triazine derivatives onto inorganic fillers. The quaternary ammonium s-triazine derivatives are prepared by sequentially substituting 3,5-diaminophenyl boronic acid, cyanuric chloride and 3-chloropropyl trimethoxysilane with 1,4-butanediamine, and then reacting with N,N-dimethyl-1,3-diaminopropane and quaternized by bromoethane. The modified additives are prepared by using modified bismaleimide monomers prepared from maleic anhydride and 5(6)-amino-1-(4-aminophenyl)-1,3,3-trimethylindane and 1-methyl-4-isopropyl cyclohexene by self-stabilizing precipitation polymerization. The pouring sealant prepared by the application has high tensile strength, good impact resistance, good heat resistance, good flame retardance, good dielectricity and good bacteriostasis.

The invention relates to a method for producing a thermoplastic polyurethane powder by means of precipitation polymerisation, comprising the steps of: i. providing A) a solvent; B) at least one polyol B1) having a molar mass of 60 g / mol to 250 g / mol; C) at least one diisocyanate C1); D) optionally a catalyst; E) optionally a chain transfer agent E1) and / or an additive E2); wherein additionally B) at least one further polyol B2) that is different from polyol B1) and / or C) at least one further diisocyanate C2) that is different from diisocyanate C1), and the amount of polyol B2) and of diisocyanate C2) in total is ≤ 10 wt.%, in relation to the total amount of the polyol B), of the diisocyanate C) and optionally of the chain transfer agent E1); ii. reacting the polyol B) with the diisocyanate C) in the solvent A) at a temperature of at most 150 °C and optionally a pressure of 0.5 to 3.0 bar, optionally in the presence of the catalyst D), the chain transfer agent E1) and / or the additive E2), to form the thermoplastic polyurethane, wherein the thermoplastic polyurethane precipitates as a solid in the solvent A) and forms a dispersion; iii. separating from the solvent A) and optionally washing the thermoplastic polyurethane with a solvent; and iv. drying the thermoplastic polyurethane to give the thermoplastic polyurethane powder; wherein the thermoplastic polyurethane powder has a mass-average molar mass Mw of ≥ 45000 g / mol; an allophanate content of ≤ 0.25 mol.%, in relation to the total thermoplastic polyurethane powder; and ≥ 25.0 wt.% of a particle fraction of < 0.500 mm, in relation to the total thermoplastic polyurethane powder and / or a ratio of z-average molar mass Mz to mass-average molar mass Mw of ≤ 4.0; wherein the mass-average molar mass Mw, the allophanate content, the particle fraction and the z-average molar mass Mz are each determined by the methods presented in the description.

This invention relates to the field of polyolefin technology, and discloses a coordination precipitation polymerization method for olefin polymerization and a polyolefin thereof. The method includes mixing an olefin monomer, a catalyst, and an auxiliaries to carry out a polymerization reaction; the olefin monomer contains a nonpolar monomer and a polar monomer; the nonpolar monomer is selected from one or more of ethylene, α-olefins, or internal olefins; the polar monomer is selected from one or more of enols, unsaturated carboxylic acids, and unsaturated carboxylic acid esters; the catalyst is selected from a non-ceramic pre-transition metal complex of formula (I), wherein M is selected from a Group IVB metal; R 11 -R 15 Each component is independently selected from hydrogen, halogen, hydroxyl, substituted or unsubstituted C1-C20 hydrocarbon groups; X is selected from halogen or C1-C10 hydrocarbon groups, and n is 1 or 2. This invention eliminates the need for catalyst loading in the process, enabling self-forming of homogeneous catalyst polymerization of olefins and preparing polyolefins with good particulate morphology.