13 results about "Atom-transfer radical-polymerization" patented technology

The application discloses a preparation method and application method of a high-performance optical fiber coating modified by polymer grafted carbon nanotubes, and the preparation method comprises the following steps: pre-treating carbon nanotubes to obtain brominated carbon nanotubes; performing grafting treatment on the brominated carbon nanotubes through photocatalytic atom transfer radical polymerization to obtain polymer grafted functionalized carbon nanotubes; and mixing the polymer grafted functionalized carbon nanotubes with a prepolymer, an active diluent and a photoinitiator to obtain the required high-performance optical fiber coating. The carbon nanotubes are grafted with polyacrylate polymer chains on the surface, which can improve the dispersibility of the carbon nanotubes in the coating system, ensure the long-term stability and functional effectiveness of the carbon nanotubes in the coating, overcome the problems of poor compatibility and uneven dispersion of existing carbon-based composite coatings, improve the mechanical properties and thermal stability of the optical fiber coating, enhance the bonding strength between the coating and the optical fiber, and provide a new perspective for the preparation of high-performance optical fiber coatings.

This invention belongs to the field of semiconductor manufacturing and microelectronic chemicals technology, and relates to a nitrogen-containing heterocyclic hyperbranched acrylate cleaning dispersant for wafer fabrication processes, its preparation method, and its application. The dispersant is a hyperbranched polymer with the general formula Core-[P(MA)-Linker-NHet], where Core is the hyperbranched core, P(MA) is the poly(meth)acrylate branch, Linker is the connecting arm, and NHet is the nitrogen-containing heterocyclic functional group. The preparation method employs a combination of "core-first, arm-later" atom transfer radical polymerization or reversible addition-fragmentation chain transfer polymerization with click chemistry. This dispersant is applied to wafer wet cleaning solutions, and the cleaning method includes treating the wafer with a cleaning solution containing this dispersant. This invention's dispersant, through its unique molecular structure design, improves cleaning efficiency, exhibits excellent pattern protection and low damage, superior process compatibility, and high cleanliness, providing an effective solution to the cleaning challenges of advanced processes.

The present disclosure provides a coating composition formed from a dual cure chemistry. The dual cure chemistry can include ATRP and epoxy-polysiloxane or ATRP and polyurea. The coating composition can include a first co-reactive component and a second co-reactive component. The first co-reactive component can include a first catalyst, a ligand, and an epoxy-polysiloxane resin or an amine. The second co-reactive component can include a reducing agent and a polyamine / amino silane and a second catalyst or isocyanate. One or both of the first co-reactive component and the second co-reactive component can include an initiator and a monomer.

The application discloses a method for adjusting process parameters in an atom transfer radical polymerization process. The method is based on an orthogonal configuration method, divides an infinite chain length into finite elements and orthogonal configuration points, reconstructs a micro quality index of the process, directly solves the micro quality, and then adjusts parameters based on a micro quality model to provide effective guidance for experiments and production. The method includes a chain length discretization method, a micro quality reconstruction algorithm, an adaptive initialization algorithm and a parameter adjustment algorithm. Compared with a traditional parameter adjustment method, the method can directly solve the micro quality index, thereby guiding the parameter adjustment, and is beneficial to simulation, optimization and operation design of polymer production.

This invention relates to the field of battery technology, specifically to a lithium battery separator and its preparation method. The method includes: subjecting a polypropylene microporous separator to ultraviolet ozone treatment on the side facing the negative electrode; then fixing initiation sites through a polydopamine layer; subsequently, using atom transfer radical polymerization, grafting a copolymer of lithium sulfonyl imide methacrylate monomer and polyethylene glycol methyl ether methacrylate onto the negative electrode side in stages to form a grafting density gradient; and finally, grafting 2,2,2-trifluoroethyl methacrylate onto the brush layer ends. The separator prepared by this invention can effectively increase the lithium-ion transport number, homogenize the lithium-ion flux on the negative electrode side, significantly extend the short-circuit time of lithium symmetric batteries, improve the full-cell cycle capacity retention rate, and significantly reduce the risk of dendrite puncture after cycling, without significantly sacrificing pore permeability.

This invention relates to the field of building materials technology, and particularly to a slow-release dispersant for fair-faced concrete and its preparation method. The method uses a multifunctional alcohol compound as an initiator, and through a cationic ring-opening copolymerization reaction, copolymerizes L-lactide with a cyclic acetal monomer containing halogenated groups to prepare a multi-arm polylactic acid (PLA) macromolecular initiator containing multiple halogenated active sites. Then, using atom transfer radical polymerization as a grafting method, a mixed monomer composed of acrylate, styrene, and polyethylene glycol macromonomers is grafted onto the multi-arm PLA backbone to obtain the target slow-release dispersant for fair-faced concrete. This slow-release dispersant, due to its multi-arm topology and the synergistic hydrolysis characteristics of the main and side chains, not only possesses excellent slow-release performance and can maintain the dispersibility of concrete for a long time, but also significantly reduces the viscosity of the concrete mixture, while imparting good steady-state fluidity and high thixotropy to the concrete, solving the problems of easy segregation or rapid loss of fluidity of the slurry during construction.

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 invention relates to the field of polypropylene insulation material preparation technology, and discloses an anti-interference and anti-attenuation polypropylene insulation material for cables and its preparation process. Specifically, the process involves: preparing a vinylsiloxane hindered phenolic anti-aging monomer; based on the atom transfer radical polymerization mechanism, using the vinylsiloxane hindered phenolic anti-aging monomer as the polymerizing monomer, using the bromine functional groups on the surface of brominated nano-magnesium oxide as the initiator, and cuprous halide as the catalyst, to obtain modified nano-magnesium oxide with surface polymerized siloxane chains and hindered phenolic structures; using polypropylene as raw material, modified nano-magnesium oxide as filler, and lubricant and flame retardant as additives, and then processing through extrusion granulation, drying, and injection molding to obtain the polypropylene insulation material. This invention significantly improves the mechanical properties and thermo-oxidative aging resistance of polypropylene insulation materials by using modified nano-magnesium oxide with surface polymerized siloxane chains and hindered phenolic structures as a functional filler for polypropylene.

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.

The application provides a temperature / pH dual-response biochar-based phosphate fertilizer, a preparation method and application thereof, and belongs to the technical field of agricultural fertilizers.The temperature-sensitive chitosan derivative is prepared by sequentially performing acylation reaction, mercapto reaction and temperature-sensitive monomer reaction on chitosan; the amino-modified acylhydrazone type biochar-based phosphate carrier material is prepared by sequentially performing oxidation, adsorption of phosphorus and acylhydrazone reaction on biochar; and finally, the amino-modified acylhydrazone type biochar-based phosphate carrier material and the temperature-sensitive chitosan derivative are polymerized by using atom transfer radical polymerization reaction sites. The biochar-based phosphate fertilizer obtained by the application can realize dual response to temperature and pH. Under high-temperature conditions, the biochar-based phosphate fertilizer can be dehydrated and polycondensed to reduce release, and under acidic conditions, the biochar-based phosphate fertilizer can release phosphate by breaking acylhydrazone bonds, so as to meet the precise absorption of crops and increase the utilization efficiency of phosphate fertilizer.

The embodiment of the present disclosure provides a light emitting diode device, a display panel, a display device and a manufacturing method. The light emitting diode device comprises a substrate (1), a first electrode (2) located on one side of the substrate (1), a carrier functional layer (3) located on the side of the first electrode (2) away from the substrate (1), a quantum dot light emitting layer (4) located on the side of the carrier functional layer (3) away from the first electrode (2), and the quantum dot light emitting layer (4) has a molecular chain structure inside, wherein the molecular chain structure is formed by an atom transfer radical polymerization reaction of a first reactant and a modified molecule, the first reactant is subjected to an atom transfer radical polymerization reaction with the modified molecule through a ligand molecule A, and the modified molecule is in an initial state of being connected to one side of the carrier functional layer (3) facing the quantum dot light emitting layer (4); and a second electrode (5) located on the side of the quantum dot light emitting layer (4) away from the carrier functional layer (3).

The application provides a liquid photosensitive etching ink, a preparation method and application thereof, the ink is composed of modified acrylic polyester, mixed inorganic filler, composite photoinitiator, environmentally friendly solvent system and multifunctional additive system according to specific weight proportions. The modified acrylic polyester is prepared by atom transfer radical polymerization and is modified by functionalization, the mixed inorganic filler is a compound system of quartz powder and modified nano silicon dioxide, the composite photoinitiator is accurately proportioned by two components, the environmentally friendly solvent system and the multifunctional additive system are used to optimize the comprehensive performance of the ink. The ink has very high resolution and resolution, excellent acid and alkali etching resistance, good film forming property and substrate adhesion, is suitable for various coating and printing equipment, has high processing process tolerance, is environmentally friendly and stable in storage, and is suitable for the production of various hardware industry lines and patterns.

This invention discloses a stimulus-responsive polymer magnetic bead, its preparation method, and a method for targeted extraction of ribonucleic acid (RNA), belonging to the fields of biomedical nanomaterials and molecular diagnostics. The polymer magnetic bead comprises a magnetic carrier and a stimulus-responsive polymer grafted onto its surface. This polymer contains thermosensitive N-isopropylacrylamide segments and functional monomer segments with phosphate group affinity. The preparation method includes surface bromination of the magnetic carrier, followed by grafting the copolymer via atom transfer radical polymerization. In RNA extraction applications, these magnetic beads utilize the stimulus-responsive properties of the polymer chains to achieve dynamic adsorption and static elution, enabling direct and efficient capture of RNA from tissue lysate. This invention significantly improves the concentration, purity, and integrity of extracted RNA, while simplifying the operation steps, shortening the extraction time, and greatly reducing the use of toxic reagents, offering outstanding advantages such as low cost, high efficiency, and environmental friendliness.