18 results about "Polymer brush" patented technology

The application relates to the technical field of shoe sole materials, in particular to a foamed composite material and application of the foamed composite material in shoe materials, which comprises EVA resin, ethylene-propylene-diene rubber, wear-resistant particles, a filler, a foaming agent, a crosslinking agent, a lubricant and an activator; wherein the wear-resistant particles are modified porous corundum, which is obtained by in-situ ring-opening polymerization of flexible PCL chains in and outside the pores of the porous corundum after surface activation; and the flexible PCL chains further have polyethylene glycol-stearic acid polymer brushes. Compared with the prior art, the application has the beneficial effects that: the EVA provides good processability and elasticity, the ethylene-propylene-diene rubber endows the material with excellent low-temperature performance and aging resistance; the corundum core of the modified porous corundum provides a high-hardness wear-resistant framework, significantly reduces the abrasion amount in a unit volume, the polycaprolactone main chain and the polyethylene glycol-stearic acid side chain compensate the rigidity of the corundum, and guarantee the high resilience, especially the low-temperature resilience, of the EVA material.

This application discloses a nanovesicle, its preparation method, and its application. The nanovesicle includes a core layer containing hemostatic active ingredients; first, second, third, and fourth intermediate layers (collectively forming a shell); and an outer layer (corona). The first intermediate layer is composed of a pH-sensitive polymer material, sensitive to the absolute value of transmembrane pH difference; the second intermediate layer is composed of a hypoxia-sensitive lipid complex; the third intermediate layer is composed of an osmotic pressure-sensitive phospholipid bilayer, sensitive to the absolute value of transmembrane osmotic pressure difference; the fourth intermediate layer is composed of an inflammatory factor / reactive oxygen species-sensitive hydrogel; and the outer layer is composed of a bifunctional polymer brush possessing both temperature difference response and mechanical difference sensing capabilities. This nanovesicle can respond to multidimensional microenvironmental differences between the intravascular and extravascular sides at the bleeding point, orderly disintegrating and releasing hemostatic active ingredients, providing a feasible technical approach for developing precise hemostasis strategies that do not rely on activation of the systemic coagulation system.

A polymer-modified surface with anti-icing properties, its preparation method, and its application belong to the field of surface engineering technology. The preparation method of this polymer-modified surface with anti-icing properties includes the following steps: S1, hydroxylating and activating the surface of a substrate material, followed by immersion in an initiator monolayer assembly solution to complete surface self-assembly; the initiator monomolecule has surface anchoring groups and initiating groups; S2, immersing the self-assembled substrate material in a reaction system containing a hygroscopic polymer monomer, a catalyst, and ligands for polymerization, forming a hygroscopic polymer brush layer on the substrate material, thus obtaining a polymer-modified surface with anti-icing properties. This invention has advantages such as excellent anti-icing properties, broad substrate applicability, high interfacial stability, and resistance to lubrication layer loss.

The application discloses a kind of organic silicon polymer brush super-slippery liquid surface material and its preparation method and application, belong to functional material technical field.The glycidyl ether monomer PDMS-g-POSS-G and amine curing agent PDMS-g-D-NH2 are respectively prepared, and the glycidyl ether monomer and amine curing agent are cured on extensive substrate by addition reaction, and excellent adhesion is obtained, realizes the introduction of super-slippery liquid PDMS polymer brush coating layer;The medium of precursor slurry is non-toxic or low-toxic or safe substance, and PDMS polymer brush coating layer can be formed on the surface of substrate at room temperature, which is beneficial to large-scale operation;Due to the good chemical matching of PDMS-g-POSS-G and PDMS-g-D-NH2, the slurry is thermodynamically stable, the coating flow leveling property is good, the liquid-like activity of polymer brush is strong, the transparency of coating layer is high, and the super-slippery performance is excellent.

This invention discloses a surface-resistant, high-flux reverse osmosis membrane and its preparation method, belonging to the field of polymer separation membrane materials science and engineering technology. The preparation method includes the following steps: First, an interfacial polymerization reaction is carried out on a porous support base membrane. The interfacial polymerization aqueous solution contains a main-chain amine monomer, an anchored amine monomer with active functional groups available for subsequent reactions, and surface-modified nanoporous fillers. This invention, by constructing a mass transfer channel enhanced by nanofillers in a polyamide layer, and combining the physical shielding and hydration layer effect formed by a surface-grafted superhydrophilic zwitterionic polymer brush layer, synergistically achieves a significant increase in membrane water flux and excellent, long-lasting antifouling performance against organic and biological pollutants, while maintaining an extremely high desalination rate and a stable functional layer structure. This solves the inherent technical problems of the permeation-selectivity trade-off effect and easy fouling inherent in traditional reverse osmosis membranes.

The application discloses a kind of composite dryer coating aids and preparation method thereof, specifically related to the field of functional polymer composite coating, it is composed of main agent and auxiliary agent, main agent includes biological base modified epoxy prepolymer and phenolic epoxy resin, auxiliary agent includes surface grafted composite nano functional filler, modified amine curing agent, leveling agent and defoaming agent;Biological base modified epoxy prepolymer is prepared by the reaction of cashew phenol derivative and epichlorohydrin after toughening modification by unsaturated fatty acid;Composite nano functional filler takes nano boron nitride and silicon carbide as core, after bridging by silane coupling agent, grafted with epoxy group containing thorny polymer brush.The application realizes the high monodispersity and chemical anchoring of nano filler by molecular design, and forms interpenetrating network structure with biological base component, and the coating has high thermal conductivity, high wear resistance, excellent anti-sticking and strong adhesion, solves the problem that filler is easy to aggregate and comprehensive performance is difficult to consider, can significantly improve the running efficiency and life of papermaking dryer.

A surface for use in photolithography. The surface has a layer of a copolymer that is the polymerization product of a divinyl monomer, a polythiol monomer and a monovinyl monomer. The copolymer is covalently bound to the surface by a mercaptan group. The monovinyl monomer chelates a metal ion which is reduced to the corresponding metal nanoparticle.

The present invention provides a composition and polymer capable of forming polymer brushes that exhibit good substrate selectivity and have good brush density and heat resistance. [Solution] A composition used for selective modification of a substrate having a surface including two or more regions of different materials, comprising a polymer (A) and a solvent (S), wherein polymer (A) has constituent units derived from styrene and / or constituent units derived from styrene derivatives, and polymer (A) has a group represented by the following formula (1) at the end of its main chain. -R 1 -OP(=O)(OR 2 )2(1)

This invention discloses a magnetic microsphere modified with a high-density carboxyl polymer brush and its preparation method. The method includes the following steps: using ATRP technology, the polymerization of GMA is precisely initiated by an azide-based initiator to synthesize PGMA with controllable molecular weight and narrow distribution; the epoxy groups of PGMA undergo a ring-opening reaction with ethylenediamine, followed by reaction with bromoacetic acid to obtain a functionalized polymer brush; utilizing the high efficiency and specificity of azide-alkynyl click chemistry, the carboxylated polymer brush is covalently grafted onto the surface of the magnetic microspheres. This invention achieves precise design of the polymer brush molecular structure and successfully prepares magnetic microspheres with significantly increased carboxyl content, up to a maximum content of 1.495 mmol·g. ‑1 The polymer brush modification strategy of this invention significantly improves the functional group density on the surface of microspheres and their binding ability with biomolecules. The resulting magnetic microspheres have strong magnetic responsiveness and are not easily leaked. They can be used as high-performance platform materials and are widely used in fields such as bioseparation, diagnostic analysis and catalysis.

The application discloses a preparation method and application of a hydrophilic-hydrophobic heterogeneous structure polymer brush membrane, the membrane is based on a porous ceramic, a polydopamine coating is deposited on the surface of the membrane, a fluorine-containing silane hydrophobic layer is grafted on one side of the membrane, and a polyacrylic acid segment with adjustable molecular weight is grafted on the inner wall of the pores; the segments extending out of the hydrophobic membrane surface form a hydrophilic polymer brush, and a hydrophobic barrier-hydrophilic driver coordinated hydrophilic-hydrophobic heterogeneous structure is constructed; the preparation method comprises three steps of dopamine self-polymerization deposition, single-side hydrophobic modification and hydrophilic polymer brush construction on the hydrophobic surface; when the membrane is used for calcium carbonate crystallization regulation, electrostatic attraction of carboxyl to calcium ions and electrostatic repulsion of carboxyl to carbonate are utilized, and under the driving of pressure or concentration difference, selective transmembrane transport and interface circulation enrichment of calcium ions are realized; the application can realize that the proportion of spherical calcium carbonate is greater than or equal to 99.9%, the crystal size is continuously adjustable in the range of 2.0-5.0 mu m, and the application can be extended to tubular membrane continuous crystallization, and has good amplification potential.

This invention discloses a preparation method based on the structural modification of bio-based polyols, belonging to the field of bio-based polymer materials technology. The method includes: firstly, preparing lignin nanospheres with a surface-loaded atom transfer radical polymerization initiator as a rigid core through solvent replacement and surface modification; secondly, synthesizing a plant oil-based monomer with polymerizable activity; then, using surface-initiated atom transfer radical polymerization technology, in-situ grafting a plant oil polymer brush onto the surface of the lignin core to construct a core-shell structure precursor; finally, subjecting the shell layer of the precursor to epoxidation and ring-opening hydroxylation post-treatment. This invention achieves ordered composite of rigid lignin and flexible plant oil at the molecular scale through chemical bonding, effectively solving the problems of poor compatibility in physical blending and the uncontrollable structure of traditional modification methods; the resulting polyol possesses both rigid and flexible properties, and the preparation process is green and environmentally friendly, suitable for the preparation of high-performance bio-based polyurethane materials.

This application provides a polymer brush, its preparation method, and its application in fluid drag reduction. The preparation method includes: preparation of an initiator layer; preparation of a PNIPAM brush: under a nitrogen atmosphere, N-isopropylacrylamide, pentamethyldiethylenetriamine, and acrylic acid are added to a mixed solvent of methanol and deionized water, and then cuprous bromide is added to obtain a polymerization reaction solution. A substrate material coated with an initiator layer is immersed in the polymerization reaction solution to perform a SI-ATRP reaction, and a PNIPAM brush is obtained on the surface of the substrate material. Preparation of a DM-PNIPAM brush: 4-dimethylaminobutamine and an activator are dissolved in N,N-dimethylformamide to obtain a modified solvent. The substrate material grafted with the PNIPAM brush is immersed in the modified solvent and reacted to obtain the polymer brush, i.e., the DM-PNIPAM brush. The polymer brush provided by this application improves its stability and durability as a drag-reducing agent in fluid drag reduction.

The application discloses a kind of polymer brush functionalized liquid metal nanometer lubricating additive and its preparation method and application.The additive includes gallium indium liquid metal nanometer droplet and poly (lauryl methacrylate) -block-poly (acrylic acid) diblock copolymer grafted on its surface by coordination interaction.The preparation method includes: first, poly (lauryl methacrylate) -block-poly (acrylic acid) diblock copolymer is synthesized by atom transfer radical polymerization method;Then gallium indium liquid metal is mixed with the tetrahydrofuran solution of the block copolymer, and polymer brush functionalized liquid metal nanometer droplet is obtained by ultrasonic treatment.The application realizes the effective regulation of liquid metal nanometer droplet size by regulating the composition of block copolymer.The additive has excellent dispersion stability in base oil, and compared with base oil PAO10, the average friction coefficient is reduced by 47.0% at very low additive amount (0.1 wt%), the wear volume is reduced by 82.1%-92.8%, and excellent friction reduction and wear resistance are shown, which can be widely applied to the lubrication system of mechanical equipment.

A composition exhibiting favorable base material selectivity, and which can form a polymer brush having favorable brush density and heat resistance, as well as a polymer. The composition is used in selective modification of a base material having a surface including two or more regions made of different materials. The composition contains a polymer and a solvent, in which the polymer has a constitutional unit derived from styrene and / or a constitutional unit derived from a styrene derivative, and the polymer has a group represented by Formula (1) below at a terminal of the main chain