53 results about "Multiblock copolymer" patented technology

The present invention discloses a class of nitrogen heterocycle-substituted hexa-dentate aminophenoxy rare earth complexes (I), a preparation method thereof, and an application thereof in the highly active catalytic ring-opening polymerization of lactones. The preparation method comprises the following steps: reacting a neutral ligand with a metal raw material compound in an organic medium, then adding an alcohol for reaction, and obtaining the target compound through filtration, concentration, and recrystallization. The nitrogen heterocycle-substituted hexa-dentate aminophenoxy rare earth complex of the present invention is a highly efficient catalyst for the ring-opening polymerization of lactones, and can be used for catalyzing the polymerization reaction of lactones such as lactide, and catalyzing the one-pot copolymerization of lactide and ε-caprolactone to obtain a multi-block copolymer. The nitrogen heterocycle-substituted hexa-dentate aminophenoxy rare earth complex of the present invention has good tolerance to impurities, has very high catalytic activity, and can obtain high molecular weight polyester materials. A has a structure shown in formula (II), (III), (IV) or (V); B has a structure shown in formula (VI) or (VII).

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 invention provides a high-flowability and high-chemical-resistance ABS (acrylonitrile butadiene styrene) composition and a preparation method thereof. The composition is prepared from the following components in percentage by weight: 20 to 65 parts of ABS (Acrylonitrile Butadiene Styrene) resin, 0.5 to 1.5 parts of compatilizer, 30 to 50 parts of PET (Polyethylene Terephthalate) ester exchange master batch, 5 to 30 parts of ABS rubber powder, 0.01 to 0.05 part of chain extender, 0.1 to 0.5 part of antioxidant and 0.3 to 0.5 part of lubricant. Compared with the prior art, the PET resin with specific viscosity is selected, and more block copolymers are generated by utilizing the characteristic that the PET resin and a polyester resin material are easy to generate ester exchange reaction, so that the crystallization degree and the viscosity of the PET resin are reduced, the flowability of the PET resin is higher, and the preparation of the high-flowability ABS composition is facilitated; meanwhile, the crystallinity of the PET resin is reduced, so that the dispersed phase of the PET resin in the ABS is not easy to crystallize, the toughness of the composition can be improved, and the mechanical property and the fluidity of the composition are considered on the basis of improving the chemical resistance.

The invention discloses a kind of isocyanate-waterborne hyperbranched multi-block copolymer composite emulsion adhesive and preparation method thereof, relate to the field of adhesive preparation technology, comprise the following steps: S1: prepare amphiphilic hyperbranched skeleton macromonomer, the amphiphilic hyperbranched skeleton macromonomer contains carbon-carbon double bond functional group and functional group capable of reacting with hydroxyl group; S2: the amphiphilic hyperbranched skeleton macromonomer, buffer, deionized water and polymerization inhibitor are mixed, and then the first hard monomer, the second soft monomer, the third functional monomer and the fourth hard monomer are added in sequence to react, and an aqueous hyperbranched multi-block copolymer emulsion is prepared; S3: isocyanate is mixed with the aqueous hyperbranched multi-block copolymer emulsion to obtain an isocyanate-waterborne polymer composite emulsion adhesive. The adhesive prepared by the present invention can greatly improve the mechanical strength and water resistance of the adhesive, and can meet the adhesive needs of various occasions.

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.

Described herein are compositions of matter for novel universal dynamic crosslinkers (UDCs) and the shortest closed-loop process for upcycling of any plastics, including post-consumer plastic waste and immiscible plastic mixtures enabled by UDCs. We discovered that the specifically designed UDCs can dynamically crosslink any plastics, and more importantly mixed immiscible plastics into compatibilized living grafted multiblock copolymers. Our studies show that such UDCs can reactivate mixed plastic dead chains and dynamically crosslink them into compatibilized multiblock copolymers. The in situ generated dynamic thermosets exhibit intrinsic reprocessability as well as enhanced tensile strength and creep resistance, relative to virgin plastics. This approach avoids the need for de / reconstruction and thus provides the maximum recovery of the endowed energy and materials value of the individual plastics.

The present application belongs to the field of polymers and discloses a method for preparing a PTT-PO3G linear multi-block copolymer, comprising the following steps: Step 1: using terephthalic acid or terephthalate, 1,3-propylene glycol, and diamine as raw materials, and obtaining a prepolymer after esterification and acylation reaction; Step 2: adding polytrimethylene ether glycol to the reaction system of step 1, and performing polycondensation reaction to obtain a PTT-PO3G linear multi-block copolymer. The method adopts a two-step method, in which the PTT resin is synthesized in the first step, and the PO3G is segmented in the second step to obtain a PTT-PO3G linear multi-block copolymer. The copolymer has good fiber breaking strength, elongation at break, and elastic recovery rate. At the same time, the present invention also provides an elastic fiber and a preparation method thereof.

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%.

This disclosure relates to the field of polymer chemistry and more particularly to multiblock copolymers comprising a poly(sarcosine) block and a mixed D,L-poly(amino acid) block and uses thereof

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 discloses a method for adjusting the particle size of a fluorine-containing polymer emulsion, which comprises the following steps: in the presence of a surfactant, polymerizing monomers in an aqueous medium to obtain a fluorine-containing polymer with the emulsion particle size of 120-280nm, the average polymerization degree of the polyethylene glycol chain segment is greater than 4 and less than or equal to 100, the surfactant is a multi-block copolymer with the block number greater than 5, the block length of a single block is 1-10, and the water-oil balance value HLB of the surfactant is 14-20. Under the condition that other polymerization processes are not changed, the change of the average polymer of the polyethylene glycol chain segment in the surfactant realizes the adjustment of the particle size of the fluorine-containing polymer emulsion. The particle size of the fluorine-containing polymer emulsion is adjusted by changing the types of the buffering agents under the condition of not changing the structure of the surfactant and the polymerization process.

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 present invention relates to a method for preparing a polyolefin-polystyrene-based multiblock copolymer having a uniform structure and showing excellent physical properties through continuous type coordination polymerization and batch type anionic polymerization.

The mesoporous isoporous asymmetric material comprises at least one diblock or multiblock copolymer, wherein the material has a transition layer having a thickness of at least 300 nm and a low macropore density, and the material has a substructure adjacent to the transition layer, wherein the substructure comprises a high macropore density. A method for producing a mesoporous isoporous asymmetric material having macropores may include: dissolving at least one diblock or multiblock copolymer in a solution having one or more solvents and one or more non-solvents to form a polymer solution; dispensing the polymer solution onto a substrate or mold, or dispensing through a die or template; removing at least a portion of the solvent and / or non-solvent from the polymer solution to form a concentrated polymer solution; and exposing the concentrated polymer solution to a non-solvent to precipitate at least a portion of the polymer from the concentrated polymer solution.