126results about How to "Polymerization conditions are mild" patented technology

The invention discloses a method for preparing a graphene organic dispersion solution from hyperbranched polyethylene, which comprises the following steps: (1) proportionally mixing graphite powder, organic solvent B and hyperbranched polyethylene, and then performing ultrasonic dispersion on the obtained mixture to obtain a graphene initial dispersion solution C; and further performing low-speed centrifugation and standing treatment to obtain a graphene dispersion solution D containing excessive hyperbranched polyethylene, wherein the organic solvent B is selected from one of the following chemically pure or analytically pure agents: tetrahydrofuran, trichloromethane, n-heptane, chlorobenzene and dichloromethane; and (2) performing ultra-high-speed centrifugation or vacuum filtration on the graphene dispersion solution D obtained in the steps (1) to remove the contained excessive hyperbranched polyethylene, and further performing ultrasonic dispersion in the organic solvent B to obtain the graphene organic dispersion solution. The preparation process causes less damage to the surface structure of graphene; and the obtained graphene is low in surface defect concentration and can better take the performance advantages.

The invention relates to a preparation method for polyvinylidene fluoride with high molten fluidity. The initiator used for the polymerization is an organic initiator comprising organic hydrogen peroxide and organic peroxide with a molar ratio of 1-5, and the used conditioning agent is an ester conditioning agent with high dispensing efficiency for the system; the addition way of the initiator and the conditioning agent is a continuous addition way; the polymerization condition is mild; the polymerization product has a stable end group and a moderate molecular weight with a narrow distribution coefficient; and the product has high molten fluidity, good thermochemical stability, and significantly improved mechanical properties and weatherability.

The invention relates to a macromolecular-chain double-terminal functionalized modified butadiene-isoprene copolymer rubber. According to the invention, a functionalized initiator and an end-capping method are combined, so that the two ends of the molecular chain contain different functional groups at the same time, the two ends have good bonding force with carbon black/white carbon black; one end employs an organic lithium initiator of a protective group, so that the molecular chain contains [-Si-(OR)3], nano dispersion of a filling material in a rubber matrix can be realized; the other end contains a (-NR1R2) group, is good for mutual effect with carbon black, so that the dispersion of carbon black in the rubber matrix can be promoted. At the same time, effect between two ends of the molecular chain and carbon black/white carbon black reduce the free degree of a chain link between a final junction point in the rubber network and chain terminal, elastic recovery of a whole crosslinking network can be effectively joined, energy loss in periodical deformation is reduced, and heat and rolling resistance are improved. The double-terminal functionalized butadiene-isoprene copolymer rubber has excellent low temperature performance, and can increase the strength and dynamic mechanical property.

The invention discloses a preparation method of a silicon-based negative electrode binder of a lithium battery and the binder. The preparation method comprises the following steps: firstly, polymerizing an iodine-transfer active radical fine emulsion to prepare a polyacrylate seed emulsion, then adding styrene monomers for further polymerization, and finally, carrying out partial hydrolysis on theblock copolymer under an alkaline condition to obtain the polyethylene-polyacrylate-polyacrylic acid-polystyrene block copolymer binder. According to the invention, the preparation process is simple,the polymerization conditions are mild, the molecular weight and composition regulation of the block copolymer are convenient, the performance is controllable, the prepared binder can be used for greatly enhancing the binding force between powder granules and a current collector and the binding force among the powder granules, and the problems of volume expansion and the like in charging and discharging processes of the battery when a silicon material is used as an active substance can be relieved. In addition, the binder has good electrical conductivity and low internal resistance and can beused for preparing the silicon-based negative electrode of the lithium battery, so that the lithium ion battery has excellent electrochemical performance.

The invention discloses bio-based film-forming resin and photoresist prepared by the same. The bio-based film-forming resin is prepared by styrene derivatives and cholic acid derivatives through freeradical polymerization reaction and alcoholysis reaction. The bio-based film-forming resin is mixed with a photo-acid generator, auxiliaries, a solvent and the like to prepare the 365nm and 248nm photoresist. The bio-based film-forming resin has the advantages that polymerizable monomers containing natural product cholic acid are introduced into conventional poly(p-hydroxystyrene) film-forming resin to form the new improved film-forming resin, the new film-forming resin can increase the ultraviolet transparency of the photoresist and increase the photosensitivity of the photoresist, and the large cyclic structure of the film-forming resin can increase carbon compactness, reduce the free volume of polymerization chains, increase heat resistance and increase the etching resistance of the film-forming resin; large lateral chains can improve the problem of acid diffusion, increase dissolution difference and lower image edge roughness.

The invention relates to a preparation method of branched polystyrene-maleic anhydride, comprising the steps of: (1) under normal pressure, dissolving p-vinylbenzyl mercaptan, styrene, maleic anhydride, and an initiator for free radical polymerization in a polymerization solvent; (2) under stirring, heating the solution obtained in step (1) to a temperature of 30-40DEG C and introducing nitrogen to the solution, sealing the reaction container, keeping stirring, raising the temperature of the solution to 65-80DEG C and preserving the heat for a reaction of 10-24h; (3) after the reaction, conducting pumping filtration to the solution obtained in step (2), leaching the solid from filtration with a hot precipitating agent, then dissolving the solid in an organic solvent, filtering out insoluble impurities therein, conducting precipitation and pumping filtration to the obtained solution in a precipitating agent, subjecting the solid obtained from filtration to dissolution, precipitation and pumping filtration, and carrying out vacuum drying to the generated solid. According to the invention, the polymerization conditions are mild, the polymers have controllable structural performance, and the polymerization product has excellent performance, simple and convenient preparation operations, as well as good application.

The invention provides a stimulus-response type polypyrrole nanotube targeting drug carrier and a preparation method. A titanium dioxide nanotube array or a porous anodic alumina array serves as a template, and a polypyrrole nanotube is prepared through chemical vapor deposition; beta-cyclodextrin and a tube opening of a polypyrrole nanotube are connected through stimulus response type sensitive bonds such as acyl hydrazone bonds and disulfide bonds, and medicine can be blocked in the nanotube and released out in the faintly acid and reducibility environments; one end of a polyethylene glycol chain is connected with a folic acid targeted molecule, the other end of the polyethylene glycol chain is connected with an adamantane head base, the adamantane head base is linked up to a beta-cyclodextrin hydrophobic cavity through host and guest envelope, and folic acid molecules recognize tumor cells through a receptor-ligand medium. The stimulus-response type polypyrrole nanotube targeting drug carrier prepared through the method is uniform in particle diameter size distribution, controllable in appearance, stable in product, simple in synthesis process, low in cost and suitable for mass production.

The invention relates to a method for preparing N-isopropyl acrylamide/multi-walled carbon nanotube composite microgel through in situ polymerization in a microreactor. The method comprises the following steps of: (1) preparing modified multi-walled carbon nanotubes; (2) dispersing modified multi-walled carbon nanotubes into N-isopropyl acrylamide, N,N'-methylene bisacrylamide and distilled water solution of ammonium persulfate serving as dispersed phases, and taking N,N,N',N'-tetramethyl ethylene diamine and edible oil as solution of continuous phases; and (3) loading the dispersed phases and the solution of continuous phases into a syringe respectively, putting the syringe on two boost pumps, and connecting microchannel reactors to generate liquid drops having uniform sizes; and carrying out polymerization reaction for 1 to 3s in water bath at the temperature of between 40 and 60 DEG C, and collecting and washing the microgel. The method has the advantages of simpleness, mild polymerization condition, short reaction time of between 1 and 3s, and suitability for industrialized production; and the prepared microgel has uniform particle sizes, the sizes of polymer microspheres are controlled by regulating the flow velocity of the dispersed phases and the solution of continuous phases, and the particle sizes are between 500 and 1,000 mu m.

The invention relates to a preparation method of polyvinylidene fluoride resin for a solar backboard film. According to the method, an initiator for polymerization is an organic lipoperoxide initiator being low in reaction activation energy, and an adjustor for polymerization is low molecular weight ester with high adjusting efficiency, wherein the concentration of the initiator is 10-30% and the concentration of the adjustor is 5-30%. The continuous feeding manner is adopted, the polymerization condition is mild, the temperature is 64.5-66.5 DEG C, the pressure of a kettle is 2.95-3.15MPa, the end group of a polymerization product is stable and the molecular weight of the polymerization product is controllable in size, and the distribution coefficient is narrow. The obtained polyvinylidene fluoride product cannot be yellowed, is free from big crystal points and can satisfy the demand on technical indexes of the solar backboard film.

The invention discloses a branched modifier having the structure shown in the formula (VII), wherein R2-R7 are the same or different and are independently hydrocarbonyl or substituted hydrocarbonyl containing 1-20 carbon atoms, the substituted hydrocarbonyl is hydrocarbonyl containing terminated carboxyl or terminated amino, and at least one of R2-R7 is substituted hydrocarbonyl containing terminated carboxyl or terminated amino. The invention also provides a flame retardant nylon resin, a reactive flame retardant and diamine or dicarboxylic acid form a salt with equal mole ratio, the obtained salt solution is mixed with a nylon polymeric monomer and the branched modifier, and then a polycondensation reaction is carried out to obtain the flame retardant nylon resin. The flame retardant nylon resin has the characteristics of no halogen, environmental protection, no dripping during combustion, high flame retardant efficiency, high flame retardant grade, permanent flame retardancy and no migration.

The invention discloses a soluble benzenetetracarboxylic diimide group-containing full-conjugated polymer and a preparation method thereof. The structural formula of the full-conjugated polymer is as the follow, wherein R1 is alkyl, R2 is hydrogen or trifluoromethyl, and n is more than or equal to 1. The preparation method comprises: adopting dibromobenzene tetracarboxylic diimide and 1,4-diethynylbenzene or a derivative of the 1,4-diethynylbenzene are adopted as monomers, and a copolymerization reaction is performed under a Heck reaction condition to obtain the full-conjugated polymer. Compared to the prior art, the polymer of the present invention has the following advantages that: the strong electron-deficient benzenetetracarboxylic diimide group is introduced in the molecule of the polymer, such that the polymer has low HUMO energy level, and the electrophilic capacity of the polymer is strong; the triple bond is introduced in the polymer, such that the steric hindrance between the donor unit and the receptor unit is reduced, the polymer is regularly aligned, and the electron mobility rate of the field effect transistor device containing the polymer of the present invention can be improved, therefore, wide application prospects are provided for the fields of polymer field effect transistors, thin film transistors and the like.

A preparation method of amphiphilic photoelectric active branched macromolecules belongs to the field of macromolecular polymerization. The preparation method comprises the following steps: (1) under normal pressure condition, 7-(4-vinyl benzyloxy)-4-methylcoumarin, N-(4-vinyl benzyl)-9H-carbazole, 4-vinyl benzyl mercaptan, maleic anhydride, a radical initiator and a solvent are placed in a 250ml four-neck flask; (2) nitrogen is introduced into the container in the step (1) for 30 min, sealed stirring is carried out to fully dissolve the nitrogen, solution temperature rises to 65-70 DEG C and a thermostatic reaction is carried out for 24h; and (3) after the reaction, the solution obtained from the step (2) is precipitated in a precipitating agent and undergoes suction filtration, and a solid obtained after filtration undergoes dissolution, precipitation and suction filtration repeatedly for 3 times, and the solid obtained finally undergoes vacuum drying to constant weight. According to the invention, polymerization conditions are mild, and the preparation method is simple to operate. The polymer obtained can be used to remarkably raise dispersion stability of carbon nano-tube in an aqueous solvent.

The invention relates to the field of fuel cells, in particular to an anion exchange membrane with a strong rigid structure and a preparation method and application thereof. In order to improve the conductivity and the stability of hydroxyl, p-quaterphenyl is polymerized with different aryl monomers and ketone monomers, the main chain of p-quaterphenyl is composed of a high-molecular-weight ether-bond-free, rigid and hydrophobic aryl skeleton, positive ions with high alkali stability are combined, and the high rigidity of p-quaterphenyl is reserved. The obtained anion exchange membrane of the polyarylene piperidine homopolymer or copolymer has relatively high ionic conductivity, relatively good crystallinity, good stability and strong rigidity, can be made ultrathin and has certain stiffness, and the ion exchange membrane has a good application prospect in the field of fuel cells.

The invention discloses a preparation method of an intermediate dimethoxy carbonic acid bisphenol A diester. The intermediate is used for synthesis of polycarbonate. The preparation method is characterized in that DMC micromolecular carbonic ester and BPA are used as raw materials to react in the presence of an organo tin catalyst at the temperature of 140-250 DEG C and at normal pressure or high pressure for 0.5-48h so as to obtain a crude intermediate product; and the high-purity polycarbonate intermediate is prepared by an alcohol/water mixed solvent recrystallization method. The organo tin catalyst comprises (Ar)2SnX2, (Ar)2Sn(OH)X, (Ar)2SnO, R(Ph)SnO, R2SnX2, R2Sn(OH)X or R2SnO. The feed mole ratio of DMC to BPA is 2-20. The mass ratio of the organo tin catalyst to bisphenol A is 5 per thousand-10%. The alcohol/water mixed volume ratio is 1-3.

Disclosed is a pigment dispersion containing at least a pigment, a liquid medium and a high-molecular dispersant. The high-molecular dispersant is a block polymer represented by A-B or A-B-C, in which A, B and C each represent a polymer block and the A and C blocks may be the same or different. The block polymer and its production process are also disclosed. The high-molecular dispersant is free of problems of a smell, coloration, a heavy metal and cost, and its use can provide a pigment dispersion excellent in the dispersion stability of a pigment.

The invention discloses a preparation method of branched poly (p-hydroxystyrene). The preparation method comprises the steps: firstly, through simple free radical polymerization, with ethenylphenol acetate as a polymerization unit and vinyl benzyl mercaptane as a chain transfer monomer, preparing branched poly(p-ethenylphenol acetate) in a tetrahydrofuran solution, and then performing deacetoxylation on the branched poly(p-ethenylphenol acetate) to prepare the branched poly (p-hydroxystyrene). The polymerization process is easy to control and is capable of controlling the molecular weight of a polymer through adjusting the reaction time and the content of the chain transfer monomer.

The invention discloses a method for method for preparing a sulfur and/or selenium-containing sequence controllable polymer through a one-pot method and a product thereof. The method comprises the following steps: taking elemental sulfur or elemental selenium, asymmetric amine and isonitrile, and adding an organic solvent in the presence of protective gas, so that high-activity amine groups of the asymmetric amine are subjected to a prepolymerization reaction; continuously adding elemental sulfur or elemental selenium and isonitrile, so that the low-activity amine group of the asymmetric amine is subjected to polymerization reaction; and cooling the reaction system to room temperature after the reaction is completed, diluting the reaction mother liquor with an organic solvent, then adding the diluted reaction mother liquor into a precipitator for precipitation, collecting the precipitate, and drying the precipitate at room temperature to constant weight to obtain the sulfur and/or selenium-containing sequence controllable polymer. The preparation method of the sequence controllable polymer has the advantages of easily available reaction raw materials, mild polymerization conditions, simple process, high polymerization efficiency and abundant and clear product structure.

The invention relates to the field of preparation of high polymer materials, in particular to wholly aromatic high-temperature-resistant nylon as well as a preparation method and application thereof. The copolymerized high-temperature-resistant nylon disclosed by the invention is formed by carrying out copolycondensation on meta-aromatic diacid and meta-aromatic diamine with relatively high reaction activity; on the other hand, a certain amount of high-temperature-resistant branching auxiliary agent is introduced into a polycondensation system, and the wholly aromatic high-temperature-resistant nylon with relatively high relative viscosity and better melt flowability and processability is prepared through prepolymerization and solid-phase tackifying, and has obvious advantages in preparation of high-filling composite materials or manufacturing of complex parts; the preparation method is simple and easy to implement, and the application field is wide.