236 results about "Coordination polymerization" patented technology

A polymerization process comprising initiating a first polymerization of monomers using an initiator functionalized with an ATRP initiating site, wherein the first polymerization is selected from the group of cationic polymerization, anionic polymerization, conventional free radical polymerization, metathesis, ring opening polymerization, cationic ring opening polymerization, and coordination polymerization to form a macroinitiator comprising an ATRP initiating site and further initiating an ATRP polymerization of radically polymerizable monomers using the macroinitiator comprising an ATRP initiating site. Novel block copolymers may be formed by the disclosed method.

The invention discloses a bimetallic catalyst precursor for catalyzing olefin to polymerize or copolymerize and belongs to the field of olefin coordination polymerization. The catalyst precursor is based on a salicvlaldimine ligand and an IV group transition metal. Compared with a monometallic catalyst, with the synergistic effect of bimetals, a catalyst consisting of the precursor and alkyl aluminum has higher activity when used for catalyzing the olefin to homopolymerize or copolymerize; particularly, the activity of the catalyst can reach 5.2*104g/mol<-1>h<-1> at the ethylene pressure of 1atm when used for catalyzing 1,5-hexadiene to be copolymerized with the ethylene; and in addition, the catalyst has higher ratio of inducing a comonomer into a polymer.

The invention provides the alkene polymerization catalyst which possesses high polymerization activity and the method of preparing alkene polar monomer copolymer by using the said catalyst. The catalyst comprises (A) and (B). The (A) comprises transition metal compound whose general formula is (I), and the (B) comprises the metal organic compound or organic aluminoxane compound or ionized ionic compound. In the transition metal compound of general formula (I), the M is at the ó¾B or ó¶B in the periodic table of elements, m is a integer between 1 and 3, R1 is alkene, R2 - R5 are H, halogen, hydrocarbon radical and so on, R6 is halogen or hydrocarbon radical and so on, and X is halogen or hydrocarbon radical and so on. The alkene used in combined polymerization comprises the all alkene which can coordinate and polymerize, the polar monomer comprises the ª‡-alkene polar monomer which can coordinate and polymerize and includes NíóOíóPíóSíóBíóSi, halogen and so on.

The invention discloses a synthesis method for increasing the Pd content of a metal organic framework based on Zr(IV) ions. The method comprises the following steps: performing a coordination polymerization reaction between an organic ligand (I) and ZrCl4, and performing post-synthesis modification of the product, wherein the post-synthesis modification comprises the following specific steps: enabling a coordination polymerization reaction product, 2-pyridylaldehyde or salicylaldehyde and a catalyst formic acid in a molar ratio of 1:(1-4):(0.1-0.3) to react in an organic solvent; performing centrifugal washing of the product and dispersing in an organic solvent; adding palladium nitrate in a molar ratio of 1:(0.8-1.2); after the reactions, centrifuging and drying to obtain powder; dispersing the obtained powder into water; adding sodium borohydride in a molar ratio of 1:(0.5-1.5); and after the reactions, centrifuging, washing and drying to obtain the product. In the invention, the synthesized compound is an organic-inorganic composite supermolecular material and has a metal organic framework which is easy to operate and low in cost and has nanoscale particle size; and the compound has very high efficiency when being used as a catalytic material for benzyl alcohol oxidation and benzaldehyde condensation.

The invention discloses a method for detecting hydrogen peroxide and nitrite by an electrochemical sensor based on a dual-metal porphyrin coordination polymer. A dual-metal porphyrin coordination polymer (CoTCPP-Cu or CoTCPP-Cu/CNTs) composite material modification electrode is used as a working electrode; hydrogen peroxide or nitrite is detected by a timing current method; CoTCPP-Cu is a coordination polymer assembled by dual metals Co and Cu and tetra-(p-carboxyphenyl) porphyrin. The electrochemical sensor adopted in the method is a current type sensor, has unique dual-metal activity and is high in sensitivity; the method has the advantages of convenience in detection and wide application range; the detection limit for hydrogen peroxide can reach 5.0*10<-7>M and the detection limit for nitrite can reach 2.5*10<-6>. The detection method disclosed by the invention has the characteristics of quick on-site detection, high sensitivity, low cost and the like.

With respect to graft copolymerization of an olefin monomer with a silicone macromonomer produced by emulsion polymerization, a novel polyolefin graft copolymer and a process for producing the copolymer are provided. A composition containing the copolymer and a process for producing the composition are also provided. In the presence of a late transition metal complex coordination polymerization catalyst, an olefin monomer and a silicone macromonomer prepared by emulsion polymerization are graft copolymerized.

The invention relates to three-dimensional order mono-disperse macropore material and its preparation method and functionalizing method. The three-dimensional order mono-disperse macropore material has 91%-98% syndiotactic polyvinyl alcohol arene, 80 nm-1000 nm average aperture. Its preparation method includes the following steps: using colloid crystal mold board method to make three-dimensional order mono-disperse macropore polyvinyl alcohol without water and oxygen by coordination polymerization; using copolymerization or chloromethylation to functionalize. It has the advantages of high melting point, quick crystallization rate, strong chemical resistance, good size stability, processing surface chemical modification, and wide application prospect in sensor, photon chip, photon band gap material preparation etc.

To provide a novel cross copolymer and resin composition which are improved in heat resistance and compatibility over conventional ethylene/aromatic vinyl compound copolymers and which have low crystallinity, are excellent in softness, transparency and compatibility and show mechanical properties similar to soft vinyl chloride resins, as compared with conventional cross copolymers. A process for producing a cross copolymer, which comprises a coordination polymerization step and a subsequent anionic polymerization step, wherein in the coordination polymerization step, copolymerization of an olefin monomer, an aromatic vinyl compound monomer and an aromatic polyene is carried out by using a single-site coordination polymerization catalyst to synthesize an olefin/aromatic vinyl compound/aromatic polyene copolymer, and then, in the anionic polymerization step, polymerization is carried out in the coexistence of such an olefin/aromatic vinyl compound/aromatic polyene copolymer and an anionic polymerizable vinyl compound monomer by using an anionic polymerization initiator.

The invention discloses a bimetallic heteroligand catalyst precursor for catalyzing alkene polymerization or copolymerization, and belongs to the field of alkene coordination polymerization. The catalyst precursor comprises salicylic alidehyde imine ligands and group-IV transition metals. A catalyst composed of the precursor and alkylaluminoxane has activity of an order of magnitude of 106g*mol-1(Ti)*h-1, a molecular weight of about 200 thousands, and dispersivity of about 2.0 when catalyzing alkene homopolymerization or copolymerization. Compared with a single-metal catalyst, the catalyst has similar polymerization activity, and with the synergistic effect of the bimetal, the ratio of comonomers introduced into the polymer is higher when the catalyst is used to catalyze the copolymerization of a bifunctional alkene and ethylene.

A method for synthesizing sphere-like nano yttrium and cerium doped zirconia according to an ethylene glycol sol-gel method takes zirconium nitrate, yttrium nitrate, cerium nitrate and sodium chloride as raw materials, is a specific method used for preparing zirconia nano-crystalline with stable yttrium and cerium parts according to the ethylene glycol sol-gel method, and comprises the following steps: preparing aqueous solution containing zirconium nitrate, yttrium nitrate, cerium nitrate and sodium chloride according to the stoichiometric ratio of 96 : 3 : 1; adding ethylene glycol solution in such a manner that the ratio between the weight of ethylene glycol and the total weight of metal ions is 0.8 to 8.6; heating the mixed solution, reflowing and reacting for 1 to 12 h till sol is formed; reacting metal ions with ethylene glycol to form coordination polymer with a cross-linked structure; drying under 110 to 130 DEG C for 6 to 50 h till solid gel is obtained; washing off sodium chloride in gel with little water and alcohol; and calcining in a muffle furnace under 400 to 800 DEG C for 3 h, so as to obtain required sphere-like nano yttrium and cerium doped zirconia of which the principal crystalline phase is square phase and the particle size is about 60 nanometer.

The present invention disclosed a car polypropylene composition. The component of its component is based on the weight percentage of: polypropylene A40 ~ 94%, polypropylene B2-20%, elastic body 2 ~ 20%0 ~ 30%of talc powder, 1 ~ 2%of liquid extracting agent, and 1 ~ 3%of the aid.The polypropylene A is a common polypropylene, and its melting flow rate is 5-60g/10min, and the impact intensity of the cantilever beam gap is greater than 5KJ/m2 at 23 ° C.Ion cohesion polymerization, Ziegler-Natta negative ion cohesion aggregation or mottled metal catalysts; polypropylene B is a highly melt intensity polypropylene, its melt strength (CN) is 8-300.2-10g/10min.The advantage is: 1.The introduction of high melt intensity polypropylene and liquid extracting agent can reduce the distribution of car polypropylene and organic matter;The effective time of the secondary vacuum prolapse can increase the effective action time of the liquid extracting agent in the system.The preparation process is simple, the equipment requirements are not high, and the product yield is high.

The invention provides a drag reducer and a preparation method thereof. The drag reducer is a suspension liquid containing poly(alpha-alkene), silicone oil, an isolating agent, and a surfactant, wherein the isolating agent is a compound solid particle composed of a polyester pour-point reducer and clay. The preparation method comprises the following steps: (1) subjecting alpha-alkene to coordination polymerization in silicone oil; (2) mixing the system obtained in the step (1) with an isolating agent after the coordination polymerization, and then adding a surfactant so as to obtain a suspension liquid; wherein the isolating agent is a compound solid particle composed of a polyester pour-point reducer and clay. The drag reducer has the advantages of good storage stability, low viscosity, good fluidity, and user-friendliness, and has the functions of reducing drag and pour point. The preparation method is simple and is capable of being easily applied to industry.

The invention provides a fluorene rare earth metal catalyst, a preparation method and an application thereof. The fluorene rare earth metal catalyst has a structure expression showed as a formula (I), wherein R represents hydrogen, C1-8 silane group, C1-8 amino group or C1-8 alkoxyl group; R' represents hydrogen or C1-8 alkyl group; Ln represents a rare earth element of an element periodic table III B; and N represents 0 or 1. The novel fluorine rare earth metal catalyst can be used for catalyzing an olefin coordination polymerization reaction, a carbon dioxide and epoxide polymerization reaction and an alkyne polymerization reaction; multiple reaction types can be catalyzed by using the catalyst so that a possibility of realizing the application of the novel cationic-type rare earth metal organic catalyst in production and life is provided; and at the same time, the prepared fluorene rare earth metal catalyst has the advantages of good stability, regular shape, good stereo structure and high mechanical strength.

A method of treating rhodamine B dye waste water through photocatalytic degradation is disclosed. The method includes steps of adding a boron nitride-bismuth tungstate composite photocatalytic catalyst into rhodamine B dye waste water having a concentration of 15-25 mg/L, with the ratio of the composite photocatalytic catalyst to the waste water being 40-60 g:100 L; performing a photocatalytic reaction under an xenon lamp the power of which is 400-600 W to complete degradation of organic pollutants, with the distance between the xenon lamp and the liquid surface of the waste water being 18-22 cm. The composite photocatalytic catalyst is prepared by adding a bismuth tungstate precursor solution into a tetrahydrofuran solution of dicarbadodecaborane, performing a coordination polymerization reaction with the existence of 4,4'-bipyridine in a hydro-thermal environment, and subjecting the obtained coordination polymer to high-temperature thermal treatment. The method has advantages of simple operation, a low cost, a high degradation efficiency, and the like.

The invention belongs to the field of advanced luminescence materials, and particularly relates to an orange-red fluorescent zinc coordination polymer with mixed ligands, a preparation method of the polymer and an application of the polymer. The polymer takes a single-core cluster [ZnN3(CO2)] (formula VII) and a double-core cluster [Zn2N3(CO2)3(H2O)] (formula VIII) as joints, the joints are connected through organic ligands tpc<-> (formula IV), Hntb2<-> (formula V) and ntb3<-> (formula VI) to form a two-dimensional layered coordination polymerization structure, the color of a crystal sample isorange red under natural light and ultraviolet light of 365 nm, a solid fluorescent spectrum has double emission peaks (578nm and 654nm), the polymer is provided with a typical colored fluorescent material, and a complex aqueous solution has absorption peaks in a visible light area. By the aid of characters and the preparation method of the polymer, the polymer can be used for preparation of novel light-sensitive materials, pigments or coatings and the like, and the polymer has positive significance and values in the aspects of development and application of novel optical materials, related industrial transformation and upgrading and the like.

The present invention provides a polyolefin graft copolymer which is produced by graft copolymerization of an olefin monomer and a macromonomer, which has good handleability and excellent dispersibility in a thermoplastic resin. In a composition including the polyolefin graft copolymer, excellent surface wettability is exhibited and the increase in elastic modulus is suppressed. The invention also provides a method for producing the polyolefin graft copolymer. Furthermore, the invention provides a composition containing the copolymer and a production method therefor. The polyolefin graft copolymer can be produced, in the presence of a coordination polymerization catalyst, by graft-copolymerizing an olefin monomer and a macromonomer having a multilayer structure in an aqueous system.

The invention relates to a tanning method by using an improved-structure chromium-free retanning agent, belonging to the technical field of leather treatment. In order to overcome the defects of severe chromium pollution, low shrinkage temperature and low setting point in the retanning process, the invention provides a tanning method by using an improved-structure chromium-free retanning agent. The method comprises the following steps: adding shaving leather into a rotating drum, adding 100-150 wt% of water, regulating the temperature to 25-30 DEG C, adding 1.5-2.0 wt% of coordination polymerization inhibitor, and rotating for 10-30 minutes; regulating the pH value of the bath to at most 3.5, and rotating for 60-90 minutes; adding 1.0-2.0 wt% of tanning-assisting tannin, and rotating for 90-120 minutes; adding a non-chromium metal composite tanning agent and 0.2-0.4 wt% of alkali extractor to perform alkali extraction; and heating to 38-40 DEG C to perform treatment, and carrying out after-treatment to obtain the finished leather product. The tanning agent has the advantages of high setting point and high shrinkage temperature; and the method effectively controls the total chromium content in the wastewater and sludge.

The invention relates to a stereo-regular conjugated diene/styrene copolymer and a preparation method thereof. The copolymer is obtained through coordination polymerization by adopting a rare earth metal carboxylate based high-activity composite catalyst and a one-step or two-step charging process, and the weight average molecular weight and the molecular weight distribution index of the copolymer are 8.0*10<4>-1.3*10<6> and 1.7-9.0 respectively; and the molar content of cis-1,4 of a conjugated diene chain link is 90.0-99.5%, the total mass binding capacity of styrene is 3-80%, the molecular weight of a stereo-regular polystyrene chain segment is 1.0*10<4>-4.0*10<5>, and the stereo regularity is 30-95%. The stereo-regular conjugated diene/styrene copolymer has the advantages of good elasticity, strong deformation resistance, excellent wear resistance, low loss modulus, low heat generation, good cold resistance, high ice and snow covered pavement grip, and low rolling resistance.

The invention discloses a method for preparing a carbon nanotube/boron nitrogen co-doped porous carbon composite material and belongs to the technical field of the preparation of a super capacitor nano electrode material. The specific method comprises the steps of (1) the pretreatment of carbon nanotubes, (2) the coordination polymerization of the pretreated carbon nanotubes with a nitrogen-containing carbon source and a metal activator, (3) the further coordination and coordination body solidification of a boron source and a coordinated precursor, (4) the heat treatment of a coordination bodyunder the protection of an inert gas, and (5) acid leaching treatment, washing and drying to obtain the carbon nanotube/boron nitrogen co-doped porous carbon composite material. The product preparedby the invention has the advantages of a large specific surface, good electrical conductivity and high electrochemical activity, the method has the advantages of a simple preparation process, high safety, low production cost, high product yield and simple equipment for reaction, and so that the industrialization is easy. The prepared electrode material shows very excellent capacitance characteristics.

The invention relates to a preparation method for chiral magnetic microspheres containing a substituted acetylene polymer, which belongs to the field of functional polymer materials. The method comprises the following steps: preparing ferriferrous oxide nanoparticles by using coprecipitation and modifying the ferriferrous oxide nanoparticles by using the silane coupling agent KH-570 to obtain ferriferrous oxide nanoparticles with double bonds on their surface; carrying out coordination polymerization on alkyne monomers containing double bonds and chiral alkyne monomers under the catalysis of the metal catalyst of rhodium so as to obtain macro-molecular spiral monomers; and adding the macro-molecular spiral monomers, the ferriferrous oxide nanoparticles with double bonds, alkene monomers, an initiator and a cross-linking agent into an aqueous solution containing a suspending agent for suspension polymerization so as to obtain the chiral magnetic microspheres. A spiral polymer in a system of the invention has remarkable optical activity, and magnetic particles have magnetic responsibility; therefore, the microspheres have both optical activity of the spiral polymer and magnetic responsibility of the magnetic particles, having double functions, and have an important application value in the fields of chiral separation and chiral catalysis.

The method of preparation of nucleated semi-crystalline polyolefin via coordination polymerization, wherein the nucleating agent is dosed in form of the suspension or the solution in a non-polar hydrocarbon solvent or in concentrated organoaluminum as part of the catalyst system for α-olefin polymerization.