20 results about "Grubbs' catalyst" patented technology

The invention discloses a polymer brush with a nanoscale microphase separation structure, a polymer film and a preparation method of the polymer film, the polymer brush comprises a liquid crystal unit, and the preparation method comprises the following steps: reacting the liquid crystal unit with halogenated alcohol to prepare a liquid crystal side chain; reacting the liquid crystal side chain with norbornene dianhydride to prepare a liquid crystal monomer containing carboxyl at the tail end; reacting the liquid crystal monomer containing carboxyl at the tail end with fatty alcohol or difatty glyceride to obtain a block type liquid crystal monomer; and carrying out ring-opening metathesis reaction on the block type liquid crystal monomer under the action of a Grubbs catalyst to prepare the polymer brush. The introduction of the liquid crystal unit provides stronger driving force for microphase separation of the brush polymer, so that the nanoscale microphase separation structure can be directly obtained through an annealing process under the condition of not adding any guide layer.

The invention relates to the technical field of shoe materials, in particular to shoe material sponge applied to shoes easy to wear and take off and a preparation method of the shoe material sponge. The shoe material sponge is prepared from the following raw materials in parts by weight: 70 to 80 parts of polyether polyol, 10 to 17 parts of polyester polyol, 3 to 8 parts of a chain extender, 5 to 12 parts of thiolated nano silicon dioxide, 0.3 to 0.8 part of a Grubbs catalyst, 3 to 10 parts of self-repairing microcapsules, 1 to 3 parts of an oxazolidine crosslinking agent, 1 to 2.5 parts of a foaming agent, 0.05 to 0.2 part of a catalyst, 1 to 2 parts of a foam stabilizer and 40 to 60 parts of isocyanate. The core material of the self-repairing microcapsule is dicyclopentadiene; the method has the advantage that the fatigue resistance of the sponge for the shoe material is improved.

The invention belongs to the technical field of catalyst synthesis, and particularly discloses a preparation method of a first-generation Grubbs catalyst, dichlorophenyl ruthenium (II) dimer is used as a metal source raw material, benzaldehyde and tricyclohexylphosphine are combined to synthesize the first-generation Grubbs catalyst, in the reaction process, a dendritic multi-site di (pentafluorophenyl) boric acid catalyst is introduced, and the first-generation Grubbs catalyst is synthesized by using dichlorophenyl ruthenium (II) dimer as a metal source raw material. A di (pentafluorophenyl) boron group at the tail end forms a superacid center due to a strong electron absorption effect, and benzaldehyde carbonyl can be efficiently activated; the dendritic skeleton provides a multi-site synergistic effect and steric configuration control, enhances the substrate enrichment and transition state stabilization capability, and significantly reduces the activation energy generated by the Ru = CHPh key intermediate, and meanwhile, the key steps of further accelerating aldol condensation, metal-carbon double bond generation and the like are combined with a proper amount of alkaline accelerator, so that the preparation method has the advantages of high yield and high yield. The efficient introduction of a benzaldehyde key C1 construction unit is realized, the reaction condition is mild, and the operation is simple and convenient.

The embodiment of the invention provides an asymmetric brush polymer and a preparation method thereof. The preparation method comprises the following steps: step S1, enabling 5-norbornene-2-exo, 3-exo-dimethanol to react with 2-(dodecyl thiocarbon thio) propionic acid, so as to obtain a norbornene derivative with 2-(dodecyl thiocarbon thio) propyl ester and a hydroxyl unit at the same time; s2, enabling the norbornene derivative to react with caprolactone and methyl acrylate by utilizing a light irradiation reaction system in the presence of a ring-opening polymerization catalyst and a photocatalyst, so as to obtain an asymmetric macromonomer containing polymethyl acrylate and polycaprolactone block units at the same time; s3, enabling the asymmetric macromonomer to react in the presence of a Grubbs catalyst, so as to obtain the asymmetric brush type polymer. By applying the technical scheme provided by the invention, the technical problems that in the prior art, the synthesis steps of the asymmetric brush type polymer are tedious, multiple purification is needed, and the molecular weight and distribution of the polymer are difficult to effectively control can be effectively solved.

The invention relates to a preparation method of an integrated nonmetal spin-vibration screen frame, an upper screen frame structure of spin-vibration screen equipment adopts a screen frame and multiple layers of screen meshes which are integrally formed through plastic injection, and the preparation method of the screen frame structure comprises the following steps: S1, mixing epsilon-caprolactam, diisocyanate, an antioxidant and glass fibers to obtain a component A; mixing a Grubbs catalyst with water to form a catalyst solution as a component B; s2, the component A and the component B are contained in a storage tank of an RIM forming machine, and then injection reaction forming is conducted through the RIM forming machine; and S3, the upper surface of the screen and the inner walls of the meshes are subjected to plasma roughing treatment, and then molten plastic with the component C containing metal particles is sprayed for crystallization attachment. The invention has the beneficial effects of light weight, long service life and avoidance of non-metal foreign matters.

The invention discloses a compound, polydicyclopentadiene resin and a preparation method thereof, and the preparation method of the polydicyclopentadiene resin comprises the following steps: mixing dicyclopentadiene, a regulator, a Grubbs catalyst and a compound of formula (I), and reacting at a first temperature to obtain a product. The preparation method comprises the following steps: mixing a compound shown as a formula (I) with DCPD, a Grubbs catalyst and a regulator to form a composition, and controlling a polymerization process to prepare a material which has excellent mechanical strength and can be controllably degraded under the conditions of acid or alkali and the like. The phosphate group contained in the hydrogel can generate inorganic phosphate after being hydrolyzed, the hydrogel has good biocompatibility, pollution which cannot be degraded by traditional cross-linked macromolecules can be relieved, and degradation products still have good environment-friendly properties.

The invention relates to the technical field of fused deposition 3D printing wire preparation, in particular to a cycloolefin polymer-based flexible printing wire material, a preparation method and a solar interface evaporator. The method comprises the following steps: catalyzing a cycloolefin monomer to generate olefin metathesis ring-opening polymerization reaction by utilizing a Grubby catalyst to form a cycloolefin polymer; under the action of a photoinitiator, a mixture formed by the cycloolefin polymer and a filling material is subjected to ultraviolet light curing, and a cycloolefin compound is obtained; and extruding the cycloolefin compound through a screw to prepare the cycloolefin polymer-based flexible printing wire material. By regulating the crosslinking density of the cycloolefin compound, on the basis of keeping flexibility, the mechanical property is improved, and the problem of contradiction between high elasticity and dimensional stability of a flexible device material is solved. The solar interface evaporator with high water evaporation efficiency is prepared by developing a cycloolefin polymer material capable of FDM printing and constructing a bionic gradient pore structure.

The present application relates to the field of biotechnology, and particularly to an enzyme composition and its application in preparing ceramide NP. The present application provides a new method for synergistically catalyzing the synthesis of ceramide NP by multiple enzymes; the method is based on enzyme directed evolution, and uses propenal and glycine as starting substrates, and under the action of mutant glycine aldolase, enaminoketol reductase, pentenoate ligase, olefin reductase, phosphite dehydrogenase and polyphosphate kinase, and in cooperation with a metal catalyst Grubbs Catalyst, to realize the synthesis of high-efficiency and high-purity ceramide NP; compared with the traditional microbial fermentation method, the synthesis path of the present application has the advantages of mild reaction condition, convenience for continuous production, short conversion period (<8h), low cost and high product purity (byproduct content <0.5%), and is suitable for the demand of industrial large-scale production.

The present invention relates to a method for synthesizing a phosphoniamidate derivative in a single step or directly through ultrasonic irradiation and portionwise addition of the Hovayda-Grubbs catalyst.

The invention discloses a atractylenolide synthesis intermediate and a synthesis method of atractylenolide and a derivative thereof, and the method comprises the following steps: oxidizing methyl in a compound 17 to prepare a compound 18; preparing a compound 19 from the compound 18 under the action of a Grubbs catalyst; carrying out hydrogenation reduction on the compound 19 to prepare a compound 20; dehydrating and eliminating the compound 20 to obtain a compound 21; hydrolyzing the compound 21 to obtain a compound 22; according to the invention, asymmetric total synthesis of atractylone, 13 kinds of eudecane atractylenolides and lactam natural products is finally realized, the technical bottleneck of chiral control of the compounds is broken through for the first time, the convergent design has both step economy and derivative universality, and especially, the type of a nucleophilic reagent is changed by a system, so that the method is suitable for industrial production. And derivative libraries with various structures are successfully constructed.

This invention discloses a modified bamboo-based fiber composite material and its preparation method. Specifically, it relates to a modified bamboo-based fiber composite material, characterized by comprising the following components in parts by weight: 80-100 parts modified bamboo fiber, 70-90 parts epoxy resin, and 2-5 parts curing agent. The modified bamboo fiber is prepared through the following steps: Step 1: Immersing the bamboo fiber in a 10-15% sodium hydroxide solution at 70°C for 3-6 hours, then washing with water until neutral and drying; Step 2: Immersing the bamboo fiber treated in Step 1 in an aqueous mixture containing 0.6%-1.4% Grubbs catalyst, stirring and soaking for 12-24 hours; Step 3: Mixing the dried bamboo fiber treated in Step 2 with dicyclopentadiene microcapsule powder at a mass ratio of 30-50:1 until homogeneous. The modified bamboo-based fiber composite material prepared by this invention exhibits good mechanical properties.

A method for modifying a material through rapid surface grafting, and a use thereof are provided. In the method, with an olefin-functionalized nanomaterial as a model matrix, a cycloolefin as a polymerization monomer, a Grubbs catalyst as an initiator, and ethyl vinyl ether as a terminator, surface olefin cross-metathesis is conducted to prepare a polyolefin-grafted nanomaterial. In the use, with a thermoplastic resin as a matrix and the surface-polyolefin-grafted nanomaterial as a reinforcing material, a composite is prepared. The compatibility between the reinforcing material and the thermoplastic resin matrix is evaluated through cross-sectional morphology and mechanical performance characterization. A chain-transfer reaction is adopted as an alternative approach for surface-initiated ring-opening metathesis polymerization to avoid the growth of polymer chains from the surface. This alternative approach can significantly improve a reaction rate, shorten a reaction time, and simplify a technical flow, and demonstrates a promising industrialization prospect.

The application relates to the fields of dielectric materials and energy storage materials, and discloses a high-temperature dielectric polymer as well as a preparation method and application thereof, the preparation method comprising the following steps: subjecting 5-norbornene-2,3-diformamide to a reduction reaction through lithium aluminum hydride to obtain a 5-norbornene-pyrrolidine intermediate; placing the intermediate and p-toluenesulfonyl chloride in a chloroform solution, and adding triethylamine dropwise to react; obtaining norbornene pyrrolidine benzene sulfone monomers; subjecting the monomers to ring-opening metathesis polymerization reaction through Grubbs catalyst to obtain poly-norbornene pyrrolidine benzene sulfone; placing the poly-norbornene pyrrolidine benzene sulfone and p-methylbenzenesulfonyl hydrazide in a toluene solution, and subjecting to hydrogenation reaction to obtain the target polymer. The polymer of the application only needs to be applied with a low electric field intensity of 350 MV / m at 150 DEG C, and the electric polarization energy storage density (charge and discharge efficiency > 90%) of about 10.8 J / cm 3 can be obtained, which exceeds existing high-temperature polymer dielectric materials.

The invention discloses a high-impact-resistance self-repairing polyurea-nano composite coating as well as a preparation method and application thereof in nuclear power plant protection, and belongs to the technical field of coating materials. The water-based polyurethane adhesive is prepared from the following raw materials in parts by weight: 20 to 30 parts of modified isocyanate, 30 to 40 parts of hydroxyl-terminated polybutadiene, 5 to 10 parts of nano silicon dioxide, 8 to 15 parts of microencapsulated dicyclopentadiene, 0.1 to 0.5 part of a Grubbs catalyst, 3 to 8 parts of an aminated carbon nanotube, 0.5 to 1.5 parts of a TEDA catalyst and 20 to 30 parts of a DMF (Dimethyl Formamide) solvent. The composite coating prepared by the invention has high impact resistance, self-repairing capability, electromagnetic shielding function and radiation resistance, is suitable for protecting key equipment and structures of the nuclear power station, and effectively improves the safety and durability of facilities of the nuclear power station.

[Problem] To easily produce an oxypropylene group-containing glycol ether that substantially contains no allyl group-containing impurity and does not adversely affect a polymerization reaction of a polyether-polysiloxane block copolymer when used as a reaction solvent or a diluent, by easily separating the oxypropylene group-containing glycol ether by distillation or the like in a facility and a reaction process that are industrially relatively easy and simple. [Solution] An oxypropylene group-containing glycol ether production method which includes a step for isomerizing an allyl group-containing impurity contained in an oxypropylene group-containing glycol ether by using a ruthenium carbene complex that is known as a Grubbs catalyst, and preferably further includes a purification step for separating the oxypropylene group-containing glycol ether by using a means such as distillation.

A prepolymer and a resin composition containing the prepolymer are provided. The prepolymer is obtained from a prepolymerization reaction of a mixture, the mixture including 100 parts by weight of a compound of Formula (1) and 0.01 to 0.09 part by weight of a Grubbs catalyst. The resin composition may be used to make various articles, including a prepreg, a resin film, a laminate or a printed circuit board, and at least one of the following properties can be improved, including copper foil peeling strength and passive intermodulation.

The application discloses a preparation method of bottle brush polymer, comprising the following steps: heating norbornene-terminated polyester macromonomer to a molten state, adding a ROMP catalyst under the condition of containing a ligand to initiate a ring-opening metathesis polymerization reaction, and obtaining the bottle brush polymer; wherein the ligand is used for adjusting the activity of the ROMP catalyst, the polymerization reaction is carried out in a bulk system, and the content of the organic solvent in the bulk system is less than 8 wt%; and the ligand is pyridine. By adding the ligand (such as pyridine) into the reaction system, the initial activity of the Grubbs catalyst (such as G3) is effectively controlled, the catalyst is uniformly dispersed in the melt, then the norbornene-terminated polyester macromonomer is smoothly and controllably subjected to bulk ring-opening metathesis polymerization (ROMP) in a molten state, and the large amount of organic solvent required in traditional solution polymerization and the subsequent cumbersome removal process are avoided.

The invention relates to the technical field of polymer synthesis, and discloses a polyolefin-polycarbonate grafted copolymer and a preparation method thereof. A metalloporphyrin complex, quaternary ammonium salt and a Grubbs catalyst are adopted as a composite catalytic system, and CO2, an epoxy monomer and a cycloolefin monomer are copolymerized through a one-step method to prepare the polyolefin-polycarbonate grafted copolymer. The preparation method disclosed by the invention has the beneficial effects that the graft copolymer is obtained by adopting one-step polymerization, so that compared with a traditional two-step method, the preparation efficiency is improved, and meanwhile, the preparation cost is reduced; polyolefin and polycarbonate are prepared into a grafted copolymer, so that the mechanical property of polycarbonate can be greatly improved.

The invention provides a binuclear ruthenium carbene catalyst and a preparation method and application thereof.The binuclear ruthenium carbene catalyst has the structure shown in the formula I. The binuclear ruthenium carbene complex has the advantages of being easy to synthesize, high in activity, small in catalyst dosage and high in stability, and can solve the problem that in cycloolefin metathesis polymerization reaction, an existing Grubbs catalyst is not prone to generating side reactions in the prior art. The problems of large catalyst dosage, low catalyst stability and the like exist.

This application discloses a polymer brush with a nanoscale microphase separation structure, a polymer film, and a method for preparing the same. The polymer brush includes liquid crystal units. The preparation method includes: reacting the liquid crystal units with a haloalcohol to prepare liquid crystal side chains; reacting the liquid crystal side chains with norbornyl olefinic anhydride to prepare a liquid crystal monomer with a carboxyl group at the end; reacting the liquid crystal monomer with a fatty alcohol or a diglyceride of fatty acid to obtain a block liquid crystal monomer; and subjecting the block liquid crystal monomer to a ring-opening metathesis reaction under the action of a Grubbs catalyst to prepare the polymer brush. The introduction of liquid crystal units in this application provides a stronger driving force for the microphase separation of the brush-like polymer, thus allowing the nanoscale microphase separation structure to be obtained directly through an annealing process without adding any guiding layer.