30 results about "Multiblock copolymer" patented technology

The invention is directed to a biodegradable, thermoplastic multiblock copolymer, to a process for preparing a biodegradable, thermoplastic multiblock copolymer, to the use of a biodegradable thermoplastic multiblock copolymer, to a composition for the delivery of at least one pharmacologically active compound to a host, and a medical device comprising a biodegradable, thermoplastic multiblock copolymer. The biodegradable, thermoplastic multiblock copolymers of the invention comprise at least one prepolymer (A) segment and at least one hydrolysable amorphous prepolymer (B) segment, wherein the segments are linked by a multifunctional chain extender, wherein the at least one prepolymer (A) segment comprises: a) one or more hydrolysable linkages, b) a water-soluble polyoxazoline-based polymer, and c) reaction products of one or more cyclic monomers and / or one or more non-cyclic monomers, wherein the water-soluble polyoxazoline-based polymer is a polymer containing a repeating unit of structure −[N(COR1)CH2CH2]n− where R1 is independently selected for each repeating unit from an alkyl group and n is 3-100, and wherein the multiblock copolymer is amorphous.

The present invention relates to a thermoplastic resin composition comprising polypropylene and a multi-block copolymer, the thermoplastic resin composition according to the present invention exhibits excellent scratch resistance, and thus can be effectively used as a resin composition for manufacturing products requiring scratch resistance, for example, automotive interior materials.

A surfactant composition comprises one or more multi-block copolymer surfactants having the general formula: R-O-[AO] x [AOa EOb] y [EO] c, wherein R is a linear or branched, saturated or unsaturated C6 to C18 carbon chain; aO is a C3 to C6 alkylene oxide, and x ranges from 0 to 5; y is at least 1, [AOa EOb] represents a block copolymer wherein a ranges from 1 to 20 and b ranges from 0.5 to 3.5; and c ranges from 1 to 50. A process includes polymerizing one or more C3 to C6 alkylene oxides in the presence of an alcohol R-OH to produce a first product; polymerizing a mixture of one or more alkylene oxides and ethylene oxide in the presence of the first product to form a block [AOa EOb] and produce a second product; and polymerizing ethylene oxide in the presence of the second product to produce the multi-block copolymer surfactant.

A polyolefin-polystyrene-based multiblock copolymer and method of making the same are disclosed herein. In some embodiments, a polyolefin-polystyrene-based multiblock copolymer satisfies conditions (a) a weight average molecular weight is 100,000 to 300,000 g / mol; (b) molecular weight distribution is 1.5 to 3.0; (c) measured results of gel permeation chromatography, a graph having an x-axis of log Mw and a y-axis of dw / dlog Mw, are fit to a Gaussian function, where all constants satisfy −0.01<A<0.03, 4.8<B<5.2, 0.8<C<1.2, and 0.6<D<1.2; and (d) a polyolefin block comprises one or more branch points, where a carbon atom at the branch point is represented by a peak of 36 to 40 ppm, and a terminal carbon atom of a branched chain from the branch point is represented by a peak of 13 to 15 ppm.

This invention provides a high-performance, closed-loop, multi-block thermoplastic elastomer and its preparation method. The multi-block thermoplastic elastomer is prepared by copolymerizing γ-methyl-ε-caprolactone or β-methyl-δ-valactone and α,α-dialkyl-δ-valactone monomers via a sequence-controlled polymerization method. The method provided by this invention has the following advantages: 1) The raw materials used are biomass-derived, and the prepared multi-block copolymer can be completely depolymerized and recovered to obtain a monomer mixture in the presence of a catalyst. The mixture does not require separation, and the mechanical properties of the TPE obtained by repolymerization are identical to the initial mixture, solving the problems of complex and time-consuming monomer separation in previously reported methods; 2) The catalytic system used has high catalytic activity and a high monomer conversion rate (≥94%); 3) The prepared TPE material has high mechanical strength and good resilience.

The invention relates to a monomolecular micelle aqueous solution as well as a preparation method and application thereof, and belongs to the technical field of biomedicine. The monomolecular micelle aqueous solution is formed by assembling an amphiphilic polyether ester multi-block copolymer in an aqueous phase. The preparation method comprises the following steps: dissolving an amphipathic multi-block copolymer in a good solvent, slowly adding deionized water into the amphipathic multi-block copolymer, or slowly dropwise adding the amphipathic multi-block copolymer into a large amount of deionized water, self-assembling to form a monomolecular micelle, and removing the good solvent in water through dialysis to obtain a monomolecular micelle aqueous solution. And the amphiphilic polyether ester multi-block copolymer has good biocompatibility and degradability. The prepared monomolecular micelle has excellent stability and cannot be dissociated along with the dilution of the polymer concentration, and the problem that the current common micelle is dissociated along with the dilution of the polymer concentration is solved. The prepared monomolecular micelle has a good solubilizing effect on water-insoluble drugs, and can be used in the fields of drug extraction, drug delivery, controllable release and the like.

The present invention relates to a thermoplastic resin composition including a polyolefin-polystyrene-based multi-block copolymer having a structure in which a polystyrene chain is attached to both ends of a polypropylene and polyolefin chain, and the thermoplastic resin composition according to the present invention has excellent elongation and tensile strength as well as high fluidity properties, and thus, may exhibit excellent molding processability.

A multiblock, cationic-functionalized norbornene copolymer is formed by a process including performing a vinyl addition polymerization in the presence of a metal catalyst of a first norbornene monomer substituted with a first alkyl group and a second norbornene monomer substituted with a second alkyl group by adding a predetermined amount of the first norbornene monomer and a predetermined amount of the second norbornene monomer sequentially to the reaction to form blocks of an intermediate norbornene multiblock copolymer. The second alkyl group includes a substituent which undergoes a reaction with a precursor for a cationic group having a volume less than 0.25 cm3 / mol. The process further includes reacting the precursor for the cationic group with the intermediate norbornene multiblock copolymer to form the multiblock, cationic-functionalized norborene copolymer.

The present disclosure provides a process. The process includes (i) crosslinking pellets composed of a silane-grafted ethylene / α-olefin multi-block copolymer (Si-g-OBC) to a gel content from 10% to 80% to form crosslinked Si-g-OBC pellets; and (ii) foaming the crosslinked Si-g-OBC pellets to form crosslinked Si-g-OBC foam beads having a gel content from 10% to 80%.

A hot melt adhesive (HMA) composition comprises: a) an ethylene / alpha-olefin multi-block interpolymer that has a melt viscosity (177° C.)≤50,000 mPa·s; b) an anhydride and / or carboxylic acid functionalized propylene-based polymer that has a melt viscosity (190° C.)≤50,000 mPa·s; c) a tackifier; and d) a wax. Such composition delivers both a high temperature heat resistance and a fast set time.

The invention provides a swelling pore-forming method for a block copolymer taking polydimethylsiloxane (PDMS) as a dispersed phase, which comprises the following steps: immersing a compact block copolymer film taking the polydimethylsiloxane (PDMS) as the dispersed phase into a swelling agent, and swelling at 20-65 DEG C for 1-60 minutes to form pore channels; one phase in the block copolymer is a main phase with the mass percentage content being more than 50%, the other phase is a dispersed phase PDMS with the mass percentage content being less than 50%, and the sum of the mass percentage content of the dispersed phase PDMS and the main phase is 100%; micro-phase separation can be carried out between the main body phase and the dispersed phase to generate respective phase regions; the Hassen interaction parameters of the main body phase and the dispersion phase with the swelling agent are both greater than 0.5. According to the pore-forming method, more segmented copolymers can be swelled by using more swelling agents to form pores. And the selective swelling trepanning method has a wider application range.

The present disclosure provides an article. The article includes a crosslinked foam composition, an adhesive layer, and a substrate composed of an olefin-based polymer. The crosslinked foam composition includes an ethylene / α-olefin multi-block copolymer, an ethylene / propylene / diene terpolymer (EPDM), optional silicone rubber, optional blend component selected from ethylene / α-olefin random copolymer, ethylene-vinyl acetate copolymer (EVA), styrene-butadiene block copolymer, hydrogenated styrene-butadiene block copolymer, and combinations thereof, optional plasticizer, optional filler, and optional additive.

The present invention relates to the use of multi-block copolymer compositions as sacrificial materials for 3D fused deposition modeling.

The invention discloses a modified non-hydrogenated styrene elastomer material and a preparation method thereof, relates to the technical field of high polymer material synthesis and modification, and provides a structural formula of the modified non-hydrogenated styrene elastomer material. The modified non-hydrogenated styrene elastomer material is prepared by condensation polymerization of a high-molecular polymer of a single-end functionalized or double-end functionalized non-hydrogenated styrene elastomer, isocyanate with a structural general formula of OCN-R-NCO and an amino silane compound in an organic solvent. The elastomer material disclosed by the invention is a multi-block copolymer which takes a non-hydrogenated styrene elastomer material as a main component, so that the surface performance of the styrene elastomer is remarkably improved, and the problems of poor stain resistance and oil resistance of styrene thermoplastic elastomers can be effectively solved.

A method for forming an isoporous graded film comprising multiblock copolymers and isoporous graded films. The films have a surface layer and a bulk layer. The surface layer can have at least 1 x 1014 pores / m2 and a pore size distribution (dmax / dmin)) of less than 3. The bulk layer has an asymmetric structure. The films can be used in filtration applications

The application discloses a controllable layered distribution PBAT-based degradable lunch box material and a preparation method thereof, and a degradable lunch box, and belongs to the technical field of polymer material processing and molding. The controllable layered distribution PBAT-based degradable lunch box material comprises polybutylene adipate terephthalate, which is composed of aliphatic segments and aromatic segments, and is a multi-block copolymer with controllable layered distribution tendency. The number average molecular weight Mn of BA segments is 3000-8000 g / mol, the number average molecular weight Mn of BT segments is 15000-35000 g / mol, and the molecular weight ratio of BA segments to BT segments is 1:3 to 1:5. The melt index of PBAT is 3-8 g / 10min (190 DEG C 2.16 kg). The degradable lunch box material solves the problem of aromatic microplastic residue caused by different degradation steps of PBAT-based lunch boxes.

The invention belongs to the field of rubber materials, and particularly relates to a low-temperature-resistant, crystallization-resistant and wear-resistant rare earth butadiene rubber material and a preparation method of the low-temperature-resistant, crystallization-resistant and wear-resistant rare earth butadiene rubber material. The preparation method comprises the following steps: introducing two novel modifiers, namely a self-synthesized polysiloxane polyether multi-block copolymer and a fullerene styrene maleimide dendritic polymer, forming a pre-dispersed composite filler with white carbon black, and mixing and vulcanizing in cooperation with a vulcanization system and other auxiliaries. Wherein the polysiloxane polyether multi-block copolymer effectively inhibits low-temperature crystallization of rubber through molecular chain entanglement, the fullerene styrene maleimide dendritic polymer serves as a nano reinforcing agent to remarkably improve the wear resistance, and due to the synergistic effect of the polysiloxane polyether multi-block copolymer and the fullerene styrene maleimide dendritic polymer, the material has excellent low-temperature resistance, crystallization resistance and wear resistance while keeping high elasticity. The process is simple and controllable, the obtained product can still keep good physical and mechanical properties in an extremely low-temperature environment, and the method is suitable for manufacturing high-performance tires and various cold-resistant rubber products.

This invention discloses a low-rolling-resistance biodegradable superdispersant and its preparation method, belonging to the field of polymer composite material additives. The superdispersant has a multi-block copolymer structure, comprising: a biodegradable main chain backbone composed of polylactic acid and polycaprolactone; dopamine anchoring groups containing catechol covalently linked to the ends of the main chain; and a dynamic covalent crosslinking network formed by furan and maleimide through a Diels-Alder reaction. The preparation method includes: ring-opening polymerization to prepare PLA-b-PCL block copolymer; DCC / DMAP catalytic grafting of dopamine; grafting of furanylformic acid; and a DA cycloaddition reaction with bismaleimide. The superdispersant of this invention promotes the biodegradation of the PLA / calcium carbonate composite system with a low loss factor. This invention solves the dual problems of existing dispersants being non-degradable and increasing rolling resistance, and is applicable to tires, packaging, automotive interiors, and other fields.

The present invention addresses the problem of providing a novel polymer (multi-block copolymer) which has an ability equivalent to the conductivity of a liquid electrolyte, has excellent adhesion between an inorganic electrolyte and an electrode, and is safe and highly stable. The solution of the present invention is to prepare a multi-block copolymer in which two or more unit structures, each of which is obtained by bonding a soft segment comprising polyglycidyl (PGLYD) and a hard segment comprising polyethylene glycol (PEG), are linked.

A method for forming a composition comprising an ethylene / vinyl arene multi-block interpolymer, comprising polymerizing a mixture comprising ethylene, vinyl arene, and optionally an alpha-olefin in a single reactor in the presence of at least: a) a first metal complex selected from formula (A) as described herein; b) a second metal complex selected from formula (B) as described herein; and c) a chain shuttling agent selected from dialkyl zinc, trialkyl aluminum, or a combination thereof. The composition comprises an ethylene / vinyl arene multi-block interpolymer comprising at least one polymer structure selected from -(AR)-(AP)-(AR)-(AP)-(Structure 1), or (AR)-(AP)-(AR)-(AP)(Structure 2), wherein each (AR) segment independently comprises, in polymerized form, ethylene, greater than 10 mol % vinyl arene, and optionally an alpha-olefin, and each (AP) segment independently comprises ethylene, optionally up to 10 mol % vinyl arene, and optionally an alpha-olefin.

Embodiments are directed to a foamable composition comprising virgin ethylenevinyl acetate, greater than or equal to 15 phr ethylene-vinyl acetate recycled foam, elastomer, polarity modifier, a crosslinking agent, and a blowing agent. The elastomer comprises ethylene / alpha-olefin multi-block interpolymer, ethylene / alpha-olefin copolymer, or combinations thereof. The polarity modifier comprises ethylene-alkyl (meth)acrylate copolymer. Further embodiments are directed to foam articles comprising the foamable composition and processes for manufacturing the foam articles.

The invention relates to a preparation method and application of a multi-block copolymer. The preparation method comprises the following steps: by taking a first monomer and a second monomer as comonomers, in the presence of an FI catalyst, a chain transfer agent and a cocatalyst, realizing one-pot solution polymerization preparation of the multi-block copolymer by adjusting the pressure intensity of the gaseous first monomer, the multi-block copolymer is a binary multi-block copolymer and is formed by alternating A-type blocks and B-type blocks; the A-type block is a random copolymer formed by the first monomer and the second monomer under a low-pressure or normal-pressure condition, and the B-type block is a random copolymer formed by the first monomer and the second monomer under a high-pressure condition; the first monomer is selected from at least one of ethylene and propylene; the second monomer is cycloolefin. The preparation method is based on a chain transfer technology, and the preparation of the multi-block copolymer is realized by a method for adjusting the concentration of the first monomer.

The application belongs to the technical field of powder metallurgy and metal injection molding, in particular to a high-stability composite binder MIM feedstock and a preparation process thereof, comprising: metal powder, the volume percentage of which in the high-stability composite binder MIM feedstock is 60% to 70%; the composite binder system, comprising: a multi-block copolymer as a main binder, the mass percentage of which in the composite binder system is 30% to 60%, the multi-block copolymer being a hydroxyl-terminated poly(ethylene-vinyl acetate)-block-poly(caprolactone)-block-poly(ethylene-vinyl acetate) three-block copolymer. The instability problem caused by component difference in the existing composite binder system is fundamentally overcome, the uniformity of component distribution of the feedstock under long-time storage condition is ensured, and the degradation of the feedstock performance is avoided.

This invention provides a method for synthesizing acrylate block copolymers based on visible light-promoted nickel-catalyzed radical polymerization. This method utilizes a nickel-bipyridine complex and an organic photosensitizer to construct a photoinduced catalytic system, achieving controlled radical polymerization of polar acrylate monomers under visible light irradiation. During polymerization, the reversible transformation of the nickel complex between different oxidation states enables the regulation of halogen atom transfer equilibrium, thereby effectively controlling the chain growth process. This method exhibits high chain end fidelity and can precisely construct diblock, triblock, and even multiblock copolymers using a sequential feeding method. The resulting polymers possess controllable molecular weight, narrow molecular weight distribution, and well-defined block structures, making them suitable for applications in functional coatings, optical materials, and flexible electronic materials.

The invention relates to the technical field of olefin polymerization, and particularly provides a dual-core scandium catalyst and a preparation method thereof, a catalytic system, a styrene-ethylene multi-block copolymer and a preparation method thereof. The binuclear scandium catalyst has a structure as shown in a formula (1). The novel catalytic system and polymerization process provided by the invention can realize efficient and controllable copolymerization of styrene and ethylene, and accurately regulate and control the microstructure (such as sequence distribution and block characteristics) of the copolymer; therefore, the novel sPS-based copolymer with high strength, high toughness and good processability is prepared.

Disclosed in the present invention are an epoxy resin cured product and a preparation method therefor. The epoxy resin cured product of the present invention is obtained by curing an epoxy resin matrix, an epoxy resin toughening modifier, and a curing agent. The epoxy resin toughening modifier is a polyether ester amide multi-block copolymer comprising three block components, i.e., aliphatic polyether, polyester, and polyamide, the multi-block copolymer can be dissolved in the epoxy resin matrix at normal temperature or while heating to obtain a corresponding modified epoxy resin, and during the curing of the epoxy resin, the multi-block copolymer precipitates and undergoes microphase separation. Due to a small microphase separation size, the transparency of the epoxy resin cured product is good. After the epoxy resin toughening modifier of the present invention is added, the toughness, impact strength and tensile strength of the epoxy resin cured product are significantly improved, the problems of insufficient toughness, high brittleness and the like of the epoxy resin cured product and a composite material comprising same are effectively alleviated, and a high-transparency epoxy resin can be prepared.

The invention discloses a method for embedding nanopore protein into a biomimetic membrane and application of the biomimetic membrane. The method comprises the steps that the biomimetic membrane of a multi-block copolymer is prepared, and the multi-block copolymer contains a hydrophilic segment and a hydrophobic segment; embedding the nanopore protein into the biomimetic membrane; wherein the multi-block copolymer comprises a copolymer with two or more blocks; the biomimetic membrane contains an aromatic ring structure, and the aromatic ring structure is connected between the hydrophilic segment and the hydrophobic segment of the multi-block copolymer; and / or the nanopore protein contains an aromatic ring structure, and the aromatic ring structure is located on the amino acid, facing one side of the biomimetic membrane, of the transmembrane region of the nanopore protein. According to the method, the number of single holes and / or the single hole reserving rate during hole embedding of the biomimetic membrane can be increased.

The invention discloses a non-spherical nano silicon dioxide sol and a preparation method and application thereof, and the method comprises synthesis of silicon dioxide particle seed crystal and further growth of the seed crystal: preparing monodispersed seed crystal particles, and adding a trace of amphiphilic nonionic multi-block copolymer into a seed crystal growth solution to assist anisotropic growth of the seed crystal, so as to obtain the non-spherical nano silicon dioxide sol. The method comprises the following steps: adjusting the proportion and dosage of amphipathic nonionic multi-block copolymer groups, so that monodispersed seed crystals generate silica sol of non-spherical silicon dioxide particles with different morphologies, and the amphipathic nonionic multi-block copolymer has hydrophilic groups for capturing and positioning silicon dioxide; and the hydrophobic group improves the stability of the non-spherical silica sol product, and the non-spherical silica sol is not easy to agglomerate. The mass fraction is more than 15%, the primary particle size is 30-70nm, and the non-spherical ultra-high-purity silica sol is peanut-shaped, short-chain-shaped, long-chain-shaped and the like. The invention further relates to the non-spherical ultra-high-purity silica sol and application of the non-spherical ultra-high-purity silica sol in CMP.

The invention discloses a modified hydrogenated styrene elastomer material and a preparation method thereof, relates to the technical field of high polymer material synthesis and modification, and provides a structural formula of the modified hydrogenated styrene elastomer material. The modified hydrogenated styrene elastomer material is prepared by condensation polymerization of a high-molecular polymer of a single-end functionalized or double-end functionalized hydrogenated styrene elastomer, isocyanate with a structural general formula of OCN-R-NCO and an amino silane compound in an organic solvent. The elastomer material disclosed by the invention is a multi-block copolymer which takes a hydrogenated styrene elastomer material as a main component, so that the surface performance of the styrene elastomer is remarkably improved, and the problems of poor stain resistance and oil resistance of styrene thermoplastic elastomers can be effectively solved.