36results about How to "Controllable molecular structure" patented technology

The invention relates to a preparation method for a spherical polyelectrolyte brush doped conductive polymer nanocomposite material. The method comprises the following steps: preparing a spherical polyelectrolyte brush by surface-initiated polymerization, then introducing to a polymerization system, using an in-situ chemical oxidative polymerization to obtain the spherical polyelectrolyte brush doped nano conductive composite material. The prepared nano conductive composite material has the characteristics of high conductivity, good treatment performance, and simple and convenient operation process.

The invention discloses a hyperbranched organosilicon foam stabilizer and its preparation method and application, and relates to the technical field of foam stabilizer preparation. The preparation method of a hyperbranched organosilicon foam stabilizer comprises: alkoxy-terminated hyperbranched polysiloxane Alkane reacts with a hydroxyl-terminated polyether to obtain a hyperbranched organosilicon foam stabilizer, and the structural formula of the polysiloxane segment of the alkoxy-terminated hyperbranched polysiloxane is [(CH 3 ) 2 SiO] m [CH 3 C 6 h 5 SiO] n [CH 3 CH 2 CH 2 CF 3 SiO] P , where m, n and p are all integers, and m=8‑50, n=0‑12, p=0‑6, 0≤(n+p) / (m+n+p)≤0.25, 0≤ p / (m+n+p)≤0.1. The hyperbranched organosilicon foam stabilizer is prepared by the above method. The foam stabilizer has a high degree of polymerization, the molecular structure of the hyperbranched chain segment is controllable, and the molecule is adjustable. It is especially suitable for the slow rebound foam system formulation.

The invention relates to the field of polymers and discloses an H-shaped polymer and a preparation method thereof. The method for preparing the H-shaped polymer comprises the following steps: (1) a first monomer is subjected to bidirectional anionic polymerization in the presence of a double anion initiator and a solvent, an end-capping reaction is performed with an epoxy compound, dihalo acyl halide is added for an acylation reaction, and a prepolymer is obtained; (2) in the presence of a catalyst and a complexing agent, the prepolymer is used for initiating an active free radical polymerization reaction of a second monomer. The H-shaped polymer with controllable molecular structure and controllable molecular weight can be prepared through conversion from bidirectional anionic polymerization to the active free radical polymerization reaction.

The invention discloses a preparation method of a temperature-resistant and salt-resistant soluble multi-component copolymer: (1) Mixing a temperature-resistant water-soluble polymer solution and a photoinitiator solution, adding a water-soluble monomer, mixing, passing an inert gas to remove oxygen , and then placed under ultraviolet light for 10 to 30 minutes, and the light intensity was set to 500 to 10000 μW / cm 2 ; That is, a temperature-resistant multifunctional macromolecular initiator; (2) Dissolving the temperature-resistant multifunctional macromolecular initiator in water, then adding monomers, passing an inert gas to remove oxygen; Living / controllable radical polymerization of water-soluble monomers to obtain temperature-resistant and salt-resistant multi-polymers. The temperature-resistant and salt-resistant multi-component copolymer of the present invention has an ultra-high molecular weight of 1.9×10 7 Above, and temperature-resistant, salt-resistant, it can be used to increase the viscosity of aqueous solution under high-temperature and high-salinity conditions, and can be used as an oil displacement agent for tertiary oil recovery under high-temperature and high-salinity geological conditions to enhance oil recovery.

The invention discloses a method based on autocatalysis self-initiation ring opening of a poly(N-heterocylic carbene) structure to synthesize a brush polymer. The method includes: under inert gas shielding, adding annular monomer capable of being in ring opening polymerization under catalytic action of N-heterocylic carbene into an organic solution containing poly(N-heterocylic carbene), wherein a molar ratio of poly(N-heterocylic carbene) repetitive unit to at least one annular monomer is 1:1-1000, reaction temperature is minus 80 DEG C-120 DEG C, and reaction time is 10s-48h. The invention further discloses the brush polymer of a poly(N-heterocylic carbene) carbon dioxide adduct structure obtained by adding carbon dioxide to terminate reaction in the method. More brush polymers various in structure can be obtained by repeating the method. The method is simple in step, an initiator is not needed, a catalyst is metal-free, and the obtained polymer is narrow in molecular weight distribution, controllable in structure, high in grafting density and wide in application range.

The invention provides a high molecular weight unsaturated polyether macromonomer which is characterized in that the polyether macromonomer is at a liquid state at normal temperature, and the structural formula (I) thereof is expressed in the specification, wherein R<1> is same or different, and represents a hydrogen atom or alkyl with 1-20 carbon atoms; R<2> represents alkyl with 1-20 carbon atoms; R<3> represents alkyl or carbonyl with 1-10 carbon atoms; R<5> represents a hydrogen atom or alkyl with 1-20 carbon atoms; R<4>O is different, and represents oxyalkenyl with 2-18 carbon atoms; n represents the average addition mole number of the oxyalkenyl, and 5<=n<=300; and X, Y and Z are same or different, and represent -N, -O or H. By optimally designing the molecular structure, the high molecular weight unsaturated polyether macromonomer provided by the invention ensures the liquid state thereof at normal temperature while the molecular polymerization reaction activity is ensured. Besides, a preparation method of the high molecular weight unsaturated polyether macromonomer provided by the invention is simple, and the conditions are easy to control; and the product does not need slicing post-treatment, the production cost is low, and the economic benefits are increased.

The invention discloses long-chain alkyl phenyl fluorosilicone oil and a preparation method thereof. The preparation method comprises the following steps: under the protection of inert gas, a self-made polyfunctional group substituted hybrid siloxane ring body is used as a reaction raw material, a corresponding end-capping reagent is added, and a strong acid or strong base ring-opening reaction is carried out to prepare high-molecular-weight long-chain alkyl phenyl fluorosilicone oil. The preparation method is low in cost and mild in reaction condition, the molecular structure and organic group content of the product are easy to control, the organic group in the synthesized product is more uniform in distribution, the synthesized product is low in viscosity and good in heat resistance, and the lubricating property requirements within a wide temperature range are met; at the same time, the long-chain alkyl phenyl fluorosilicone oil can be used as an additive and used in a compounding manner with the synthetic oil or mineral oil, so that the lubricating properties of the synthetic oil or mineral oil are improved.

The invention discloses a method for preparing water-soluble graft polymers through active / controllable radical polymerization. The method can be used for controllable radical polymerization of various water-soluble monomers of a (methyl) acrylamide monomer, (methyl) acrylic acid, (methyl) acrylate and the like, so as to prepare the water-soluble graft polymers with different molecular weights. The preparation method is particularly realized through the following steps: firstly, preparing a water-soluble polyfunctional macroinitiator by adopting a chemical modification manner; secondly, initiating active / controllable radical polymerization of the water-soluble monomers by the macroinitiator under the heating or visible light / ultraviolet light irradiation condition, and preparing the molecular weight and chemical constitution controllable water-soluble graft polymers. The method is simple in synthetic route, low in production cost and safe and convenient to operate; the prepared macroinitiator is high in dissolution rate in water phase and high in initiating activity, and can be used for preparing the chemical constitution and molecular weight controllable water-soluble graft polymers.

The invention relates to perfluoroether-based polysiloxane as well as a preparation method and application thereof. The perfluoroether-based polysiloxane has a structure characteristic as shown in a formula (I). The perfluoroether-based polysiloxane can have excellent performance of a low-temperature-resistance property, a viscosity-temperature property, stability, corrosion resistance and anti-wear capacity, further, is little in evaporation loss, and can be applicable to the fields, with severe environments, of aerospace, special industry and the like.

The invention discloses a star-shaped amphoteric polycarboxylate water reducer with high-efficiency mud resistance and a preparation method thereof. Reversible addition-fragmentation chain transfer agent (RAFT reagent) of the shape structure, under the action of chain transfer agent and initiator, initiate (meth)acrylic acid polyethylene glycol ester, (meth)acrylic acid and (meth)acryloyl The RAFT polymerization of oxyethyltrimethylammonium chloride produces a star-shaped amphoteric copolymer, and after further processing, a star-shaped amphoteric polycarboxylate superplasticizer with a solid content of 20% and high anti-mud effect is obtained. The polycarboxylate water-reducer prepared by the invention has a high water-reducing rate, has high-efficiency anti-mud effect, and can meet higher construction requirements.

The invention discloses a star-shaped block polycarboxylic acid water reducing agent and a preparation method thereof. The preparation method comprises the following steps: enabling beta-cyclodextrin and a dithioesters compound containing acyl halide groups to react to obtain a star-shaped structure reversible addition-fragmentation chain transfer agent (RAFT reagent); and under the effect of the transfer agent and an initiator, successively initiating RAFT polymerization of (methyl)acrylate macrogol ester and (methyl) acrylate to obtain a star-shaped block polymer, and further treating the star-shaped block polymer to obtain the star-shaped block poolycarboxylic acid water reducing agent with a solid content of 20 percent. The water reducing agent prepared by the invention has the advantages of controllable molecular structure, high water reducing rate, good mobility, good dispersity, high applicability to soil and the like, can meet high construction requirements and is wide in application prospect.

The invention discloses a preparation method and application of a low-viscosity polyether type hyperbranched epoxy resin, belonging to the technical field of coatings. The preparation method uses dihydroxybenzoic acid and monofunctional glycidyl ether as raw materials to first synthesize diphenol intermediates with different side group structures, and then further polymerize with polyfunctional glycidyl ether to synthesize polyphenols with terminal epoxy groups. , Polyether type hyperbranched epoxy resin with polyether skeleton. The polyether type hyperbranched epoxy resin prepared by the invention has low-viscosity properties and can be used to modify the bisphenol A linear epoxy resin as a film-former of high-solid epoxy coatings. The solid content of the epoxy paint prepared by the invention is as high as over 90%, and the cured paint film has excellent toughness and medium resistance.

A preparation method of an epoxy chloropropane toughened high-ortho phenolic fiber comprises the following steps of heating phenol, methanal, zinc acetate and epoxy chloropropane to boiling for reaction, adding concentrated sulfuric acid for boiling and reaction continuously, washing with high-temperature water, cooling, continuously heating up during pressure reduction and dehydration, obtaining epoxy chloropropane toughened high-ortho phenolic resin, performing melt spinning on the epoxy chloropropane toughened phenolic resin, drawing to form a high-ortho phenolic fiber filament, heating, curing and crosslinking the high-ortho phenolic fiber filament in a coagulating bath containing methanal and HC1, and obtaining the epoxy chloropropane toughened high-ortho phenolic fiber. Compared with the prior art, the method has the advantages of simple and practicable reaction, good spinnability of a stock solution, high curing rate and high mechanical properties.

The invention discloses a high water reducing and high slump retention type polycarboxylate water reducing agent. A copolymer formed by atom transfer radical polymerization; the ligand is one of trimethylolpropane phosphite, bis(triphenylphosphine) nickel dibromide or trimethylolpropane sulfite Two or three of phosphate ester, bis(triphenylphosphine)nickel dibromide, and bis(diphenylphosphine)methane. The invention adopts ATRP atomic free radical polymerization reaction, so that the relative molecular weight distribution of the polymer is reasonable, and at the same time, various functional group structures such as unsaturated alkyl ester groups, acid anhydride groups and anti-mudging groups are introduced, which greatly improves the reduction of Compared with conventional ligands, the selected ligand can stabilize the catalyst well, promote the reaction to proceed, stabilize the intermediate transition state of the reaction, and reduce the generation of by-products.