454results about How to "High polymerization efficiency" patented technology

The invention discloses a cationic polymerization initiation system and a cationic polymerization method. The cationic polymerization initiation system comprises at least one initiator, at least one Lewis acid and at least one additive. The initiator is a compound capable of providing protons or carbocations, wherein a mole ratio of the initiator to monomers is (5.0*10<-5> to 1.2*10<-2>): 1. The Lewis acid is a metal halide or an organic metal halide, wherein a mole ratio of the Lewis acid to the monomers is (5.0*10<-4> to 4.0*10<-1>): 1. The at least one additive is selected from sulfur-containing organic compounds, phosphorus-containing organic compounds and organic compounds containing sulfur and phosphorus, wherein a mole ratio of the at least one additive to the monomers is (1.0*10<-3> to 5.0*10<-2>): 1. The cationic polymerization initiation system has high activity, a low price and stable properties, is convenient for use, has high polymerization efficiency, and can greatly improve polymerization product molecular weight, wherein weight-average molecular weight of polymerization products obtained at a temperature of -60 DEG C is 1*10<6>.

The invention discloses a configuration method for aggregating link service flow and a packet switching device. The method includes: a member link for aggregating link is selected according to bandwidth parameter of service flow; and service flow is carried onto the selected member link. By adopting the invention, the problem that repetitious adjusting from service flow to the member link is caused by jamming of member link or overloading in link aggregation is solved, thus the effects of ensuring service quality of service flow and improving link aggregating efficiency are achieved.

Synthesis of warm sensitive aquagel from ultraviolet light radiation polymerization is carried out by adding reacting raw materials into deionized water to prepare preformed solution, laying aside under ultraviolet light radiation, exposing, polymerizing directly to prepare cross-linking polymer, putting the polymer into sorbitic extractor, extracting from boiled deionized water for 24hrs, taking it out, and drying in vacuum drier to obtain warm sensitive aquagel. Its low critical temperature varies between 30-40 Deg C. with raw material formula. It can be used for various aquagels, medicine control-releasing system, memory element switch, artificial muscle and chemical industrial separation. It achieves low cost, simple process, high efficiency and normal-temperature operation.

The present invention relates to a method for cluster based data in wireless sensor networks. The method includes: selecting any one of border nodes positioned at the edge of a cluster as a temporary cluster head as a temporary cluster head when a target is sensed in the cluster; bugging data of the temporary cluster head by border nodes in other adjacent cluster which do not sense the target to temporarily change the border node selected as the temporary cluster head to a cluster head of each of the border nodes; when the target is sensed by at least one of the border nodes, collecting data from each of the border nodes by the temporary cluster head to transferring the collected data to an actual cluster head of the temporary cluster head; and aggregating the collected data by actual cluster head of the temporary cluster head.

A liquid crystal display device of the present invention includes: a liquid crystal layer containing a nematic liquid crystal material; a pair of electrodes opposing each other via the liquid crystal layer; a pair of alignment films respectively provided between the pair of electrodes and the liquid crystal layer; and an alignment sustaining layer formed of a photopolymerized material on each of surfaces of the pair of alignment films which are closer to the liquid crystal layer, the alignment sustaining layer being configured to regulate a pretilt azimuth of a liquid crystal molecule of the liquid crystal layer during the absence of an applied voltage across the liquid crystal layer, wherein the pretilt azimuth of the liquid crystal molecule of the liquid crystal layer is regulated by the alignment sustaining layer during the absence of an applied voltage across the liquid crystal layer. The nematic liquid crystal material contains a liquid crystal compound having a terphenyl ring system as an indispensable component, and the liquid crystal layer further contains part of a photopolymerizable compound which is a source material of the photopolymerized material, a content of the photopolymerizable compound relative to the nematic liquid crystal material being less than 0.015 mol %.

The invention provides a liquid crystal medium composite as well as a liquid crystal display using the liquid crystal medium composite and a manufacturing method of the liquid crystal medium composite. The liquid crystal medium composite comprises the following components: a liquid crystal material, a polymerizable monomer, a stabilizing agent and a sensitizing agent, wherein the sensitizing agent has strong absorption on ultraviolet light with the wavelength in a range of 300-380 nm; and the structure is formed by connecting a polycyclic aromatic hydrocarbon formed by connecting a plurality of benzene rings, with an aromatic ring. The liquid crystal display comprises an upper substrate, a lower substrate and the liquid crystal medium composite, wherein the upper substrate and the lower substrate are arranged in parallel; and the liquid crystal medium composite is arranged between the upper substrate and the lower substrate. According to the invention, the stabilizing agent which has the strong absorption on the ultraviolet light with the wavelength in the range of 300-380 nm is used so that a reaction wavelength of the polymerizable monomer can be moved towards a long wavelength; the ultraviolet light with the wavelength in the range of 300-380 nm is used for irradiating to keep away from the absorption wave section of a liquid crystal material, so that the damage effect on the liquid crystal material and an alignment material PI (Polyimide) by the ultraviolet light is reduced, and the polymerization reaction efficiency and the uniformity of the polymerizable monomer can be improved.

The present invention relates to an apparatus for preparing and supplying catalyst to an ethylene slurry loop polymerisation reactor and to an apparatus for controlling the injection of catalyst slurry in a polymerization reactor wherein polyethylene is prepared. The present invention a Iso relates to a method for optimising catalyst supply to a polymerisation reactor. The diluted catalyst is transferred to the reactor (1) using a membrane pump (5) controllable in function of the concentration of a reactant in said reactor (1).

The invention discloses a preparation method of polyene ether compounds. The method includes: organic small-molecule 4-dimethylamino pyridine (DMAP) is used as the catalyst, binary alkynyl compounds and binary hydroxy compounds are mixed with organic solvent, and the polyene ether compounds are obtained by using the click polymerization reaction of alkynyl-hydroxy. The polyene ether compounds comprise an inner unit indicated by formula (I). The polymerization step is showed in the formula (V), wherein n is larger than 1, and R1 and R2 are selected from organic groups. The method has the advantages that water and oxygen do not need to be removed during reaction, polymerization temperature is low, polymerization efficiency is high, and no metal residues exist in products; the prepared polyene ether compounds are high in steric regularity, good in machinability, and high in heat stability, degradability and aggregation-induced emission performance.

This invention relates to a method to directly synthesize pH sensitive hydrogel by ultraviolet irradiation polymerization, which is attributed to the technology of preparing pH sensitive hydrogel materials. Monomers, cross-linking reagent, additives and photoinitiators are dissolved in deionized water together at certain mass fractions and the solution is irradiated in ultraviolet light for direct cross-linking polymerization into a cross-linking polymer. The cross-linking polymer is dried and pH sensitive hydrogel is obtained. The swelling ability of the hydrogel in aqueous solution changes with pH value and reaches a maximum at the pH value range of 6~8. By varying the species and content of the additives in raw materials, equilibrium swelling coefficient and mechanical strength of the hydrogel can be adjusted for different applications. This invention has the advantages of simple technique, high polymerization efficiency, open operation at room temperature and ambient pressure, no waste liquid pollution and low cost.

The invention relates to a preparation of nano composite gel with organic/inorganic hybrid microspheres as cross linking points. The preparation comprises the following steps: (1) dissolving clay in 0-0.5mol/L aqueous electrolyte solution, ultrasonically treating after fully stirring, dropwise adding to the clay solution during the ultrasound process, heating to 70-80 DEG C after further ultrasonic treatment for a period, polymerizing in nitrogen atmosphere for 6-8 hours to obtain crosslinking point hybrid microsphere emulsion; and (2) mixing 20g of the crosslinking point hybrid microsphere emulsion with 5-10g of a water soluble monomer, 0.01-0.05g of a water soluble initiator and 8-24mul of a catalyst to obtain prepolymerized solution, polymerizing the prepolymerized solution at the room temperature of 20-30 DEG C for 30-50 hours to obtain the nano composite gel. The preparation has the advantages of simple process and high polymerization rate, the obtained macromolecular microsphere composite gel has excellent mechanical properties, and the method has large raw material range and great application value.

The present invention is electronic beam radiopolymerization process of synthesizing temperature sensitive hydrogel directly, and belongs to the field of temperature sensitive hydrogel preparing technology. Material monomer, cross-linking agent and additive in the weight ratio of 75-98.5 to 0.1-1 to 1-10 are dissolved in deionized water and polymerized through electron radiation to form cross-linked polymer. The cross-linked polymer is then extracted in a Soxhlet extractor with boiled deionized water for 24 hr and dried in a vacuum oven to obtain the temperature sensitive hydrogel. The temperature sensitive hydrogel may be used in medicine controlled releasing system, memory element switch, artificial muscle, chemical separation and other field. The present invention has the features of simple technological process, high polymerization efficiency, less pollution, low cost, normal temperature operation, etc.

The invention provides a propylene polymer and a preparation method thereof. The method provided by the invention comprises the following steps: under first olefin gas-phase polymerization conditions, performing first contact reaction on a first part of propylene and a first part of hydrogen gas, and removing unreacted monomers and hydrogen gas from the mixture obtained through the first contact reaction, thus obtaining a first contact reaction product; and under second olefin gas-phase polymerization conditions, performing second contact reaction on the first contact reaction product, a second part of propylene, a second part of hydrogen gas and a comonomer, thus obtaining the propylene polymer, wherein an olefinic polymerization catalyst system contains an external electron donor compound, the external electron donor compound contains a first external electron donor compound selected from tetraethoxy silane and n-propyl trimethoxy silane and a second external electron donor compound selected from diisopropyl dimethoxy silane and diisobutyl dimethoxy silane. The method provided by the invention has favorable hydrogen regulation sensitivity and high polymerization efficiency.

The invention relates to an olefin polymer and a preparation method thereof. According to the method, an olefin polymerization catalyst system comes into contact with one or more olefins under the condition of olefin polymerization, wherein the olefin polymerization catalyst system contains a solid component, an external electron donor compound and an organic aluminum compound, the solid component contains titanium, magnesium and an internal electron donor compound, the external electron donor compound contains a first external electron donor compound and a second external electron donor compound, the first external electron donor compound is diisobutyldimethoxysilane and the second external electron donor compound is n-propyl trimethoxysilane and/or tetraethoxy-silicone. The olefin polymerization method provided by the invention has excellent hydrogen regulation sensibility and high polymerization efficiency and is applicable to occasions of preparation of propene polymers in a gaseous polymerization way.

The invention relates to a preparation method of polychlorotrifluoroethylene resin, which adopts a horizontal reactor with an aspect ratio ≥ 1.0 as polymerization equipment; uses chlorotrifluoroethylene monomer or chlorotrifluoroethylene monomer and other comonomers The polymerization reaction occurs under constant pressure conditions, which improves the reaction speed and polymerization efficiency; the semi-mechanical and semi-chemical coagulation method is used to effectively separate the impurities in the emulsion, and the residual unstable groups are removed through wet heat treatment, effectively reducing the volatilization of the product parts, greatly improving the appearance of the product. M can be obtained by the method of the present invention _η PCTFE and its copolymerization products exceeding 500,000, volatile matter less than 0.01%, strength loss temperature higher than 260°C, yellowness index (YI) less than 10.

The invention discloses a conductive poly 3,4-ethylene dioxy thiophene film and a preparation method thereof. The method is characterized by comprising the following steps: resolving a poly 3,4-ethylene dioxy thiophene monomer in an organic solvent, resolving supporting electrolyte into water, and preparing into solutions; transferring the two solutions stepwise into an reactor, thus forming a liquid-liquid interface; inserting a working electrode in the liquid-liquid interface; placing an auxiliary electrode and a reference electrode in the supporting electrolyte solution; and carrying out electrochemical polymerization by utilizing an electrochemistry means. The invention has the advantages that the prepared poly 3,4-ethylene dioxy thiophene film has good conductivity, and the topography has obvious dual character. One side, which is close to the water phase, of the conductive poly 3,4-ethylene dioxy thiophene film is a nano smooth film; the other side, which is close to the oil phase, of the conductive poly 3,4-ethylene dioxy thiophene film is a micrometer ordered cellular porous film; and a high reaction area is revealed, and the conductive poly 3,4-ethylene dioxy thiophene film can be used for positive electrode materials and negative electrode materials of super capacitors and batteries, electromagnetic shielding materials and the like.

The invention discloses a preparation method of electric-conductive macromolecule polymer nanoparticles with good water phase dispersibility. According to the method, an electric-conductive macromolecule monomer is dissolved in an organic solvent while a persulfate aqueous solution and a ferric salt are added to synergistically oxidize and polymerize the electric-conductive macromolecule monomer to obtain the electric-conductive macromolecule polymer nanoparticles. According to the present invention, the prepared electric-conductive macromolecule polymer nanoparticles can be uniformly and stably dispersed in an aqueous solution for a long time, and has excellent electrical conductivity.

The present invention discloses a polyimidazole compound, an in-situ preparation method and applications thereof, wherein a binary isocyano compound is subjected to a cyclization polymerization reaction in an organic solvent under the action of a cyclization polymerization catalyst to obtain the polyimidazole compound. According to the present invention, the imidazole unit in the prepared polyimidazole compound is formed by carrying out in-situ polymerization on the imidazole-unit-free monomer so as to make up the gaps in the prior art; the cyclization polymerization reaction is the one-component polymerization reaction, the monomer ratio is not required to be considered, the process is simple, the reaction raw materials and the catalyst are easy to obtain, the polymerization reaction conditions are mild, the polymerization can be performed at the room temperature, and the energy source is saved; and the polymerization efficiency of the polymerization reaction is high, the high molecular weight polymer can be obtained after the reaction is performed for a short time, the polymerization reaction has excellent region selectivity and excellent stereoselectivity, no by-product is generated during the polymerization process, and the atom economy is met.

The invention discloses a method for synthesizing polyacrylate soap-free emulsion through a micro-reactor. The micro-reactor is used for carrying out synthesis; the micro-reactor is composed of a micro-mixer and a staying reaction tube which are communicated with each other; the method comprises the following specific steps: taking a double-bond acrylic monomer as an oil phase and an alkyl vinyl sulfate sulfonate water solution as a water phase; pumping the oil phase and the water phase into the micro-mixer of the micro-reactor and carrying out emulsifying to obtain a pre-emulsified solution;preparing an initiator water solution; pumping the pre-emulsified solution and the initiator water solution into the micro-reactor and reacting; and after reaction is finished, discharging in a cold water bath, so as to obtain the polyacrylate soap-free emulsion. The micro-reactor is adopted to realize controllable multi-phase micro-scale flowing, and mixing, mass transfer and heat transfer processes of a polymerization reaction process are strengthened, the reaction time is greatly shortened and the polymerization efficiency is improved; the micro-reactor has an excellent heat conduction capability, so that heat released by the reaction is dissipated in time and the control of temperature is realized; and the polymerization and explosion problem caused by the fact that the temperature ofa traditional method is too high is overcome.