504 results about "Precipitation polymerization" patented technology

The present invention is bulk depositing synthesis process of isotactic polybutylene-1, and belongs to the field of polymer technology. The powdered isotactic polybutylene-1 product is obtained through bulk depositing polymerization of butylene-1 as the monomer and reactant medium at 0-70 deg.c in the presence of supported titanium catalyst, and the subsequent flash evaporation to eliminate unpolymerized monomer. The catalyst system may have organic aluminum AlR3 as co-catalyst, added electron donor compound, and hydrogen as molecular weight regulator. The polymerization reaction is performed in a polymerizing kettle with stirring screw belt. The present invention has simple technological process, high efficiency and low cost, and the prepared isotactic polybutylene-1 has high stereoregularity degree, crystallization degree higher than 60 %, and smelting point of 127.5 deg.c.

The invention discloses a method for copolymerization of maleic anhydride/conjugated diene, relating to the field of high polymer self-stable precipitation polymerization. The invention comprises the following steps: under the protection of nitrogen, adding the monomer maleic anhydride and initiators into medium to dissolve fully; after that, adding the monomer conjugated diene into the system, dissolving, and reacting for 0.5-73h at 50-90 DEG C to obtain a disperse system of copolymer microspheres of the maleic anhydride and the conjugated diene; then obtaining a white solid of the copolymer of the maleic anhydride and the conjugated diene through centrifugation and vacuum drying. The invention has the advantages of simple process, simple post-treatment to the synthesized copolymer, low cost, environmental friendliness, etc.

The invention discloses a preparation method of functional hollow polymer microspheres. The shell of the functional hollow polymer microspheres is prepared by carrying out precipitation polymerization on a functional monomer and a crosslinking agent in different ratios; and the formed crosslinked shell has a mesoporous structure. The preparation method comprises the following steps: preparing a monodisperse polymer microsphere template by self-stabilization precipitation polymerization; directly adding the reaction system into the shell without separation to form the required functional monomer and crosslinking agent, and preparing core-shell polymer microspheres of which the shell has a crosslinked mesoporous structure by precipitation polymerization; and finally, removing the polymer microsphere core by solvent dissolution to obtain the functional hollow polymer microspheres. The technique is simple, and safe and convenient to operate, has the advantages of mild reaction conditions, no need of special equipment, high preparation efficiency, easy microsphere separation, controllable size, and very high functional group content in the polymer microspheres, and lays a foundation for large-scale industrial production of the functional hollow polymer microspheres.

The invention relates to a preparation method of isodisperse nano/micron polymer hollow microsphere. The hollow microsphere with 10 nano-10 micron inner diameter and 10 nano-200 nano wall thickness is polyene type monomer homopolymer or copolymer (20-100 percent crosslinking) of polyene type monomer and other functional monoene type monomer. The polyene type monomer or the polyene type monomer and other functional monoene type monomer are distilled with the existence of a template to prepare a series of sodisperse sodisperse hollow microsphere with different inner diameters and wall thicknesses after precipitation polymerization. The invention has the advantages of simple conditions, easy operation, pure products and being easy to get raw materials and environment protective and so on. The nano/micron polymer hollow microsphere of the invention can be applied to systems with controllable transportation and release such as dyes, cosmetics, medicine, enzymes, proteins, etc. as well as light fillings, nano micro vessels, low dielectric constant materials, catalyst carrier and has very important application value in aspects such as artificial cell, disease diagnosis, biological material separation, etc.

The invention discloses a preparation method of a functional magnetic absorbent used for treating industrial wastewater. The method comprises the following four steps of: (1) preparing a ferroferric oxide nanocluster with a high magnetic saturation value by solvothermal synthesis; (2) modifying the ferroferric oxide nanocluster surface into a double-bond functional group by adopting a sol-gel process; (3) wrapping the ferroferric oxide nanocluster surface with a polymer shell containing an epoxy functional group in a distilling, precipitating and polymerizing manner; and (4) modifying a microsphere surface into an amino group or a carboxyl group through a ring-opening reaction of the epoxy group. The magnetic absorbent is high in functional group content, fast in magnetic responsiveness, easy for magnetic separation, regular in structure, stable in chemical and physical performances and high in dispersion stability in an aqueous solution; and the surface-modified amino and carboxyl functional groups can efficiently adsorb a plurality of heavy metals or organic pollutants, so that the magnetic absorbent can be applied to the field of industrial wastewater treatment. The preparation method is simple to operate and controllable in process and has a good application prospect.

The present invention is a preparation method of the trans-isoamyl rubber complex, the product and the application. The trans-isoamyl rubber complex is made by doing the binary, ternary, quaternary or multi-blend and total vulcanization with the synthetic reversing formula 1, 4-polyisoprene and the general rubber such as the natural rubber, the styrene-butadiene rubber, the polybutadiene rubber, the cis-polyisoprene rubber, the ethylene propylene rubber, the nitrile rubber, the chloroprene rubber and so on, or with the special rubber. The TPI is used to load the titanium catalyst to catalyze the synthesis of the polyisoprene body through the methods of deposition and polymerization. The structural content of the formula-1, 4 is equal to or more than 90 percent. The present invention makes a rubber complex containing the TPI to overcome the insufficiency of the existing rubber complex in the dynamic performance and to reach the balance between the rolling resistance, the traction performance and the wear performance; the trans-isoamyl rubber complex of the present invention is suitable for the rubber products used in the tire surface and side, the shock absorber product for trains and vehicles, the V-belt, the conveyor belt and in other dynamic uses.

The invention relates to three-layer core-shell-structure inorganic nanoparticle/silicon dioxide/high polymer composite microspheres and a preparation method thereof. The average particle size of the composite microspheres is 15-800nm, the particle size is uniform, the three-layer core-shell structure is obvious, and the inorganic nanoparticle is completely coated to enter the silicon dioxide and high polymer shell. By using the hydrophilic high polymer as the stabilizer, the inorganic nanoparticles can be uniformly dispersed in ethanol, acetonitrile or any other polar solvent, and can not generate the phenomenon of aggregation or precipitation; and thus, the invention can implement preparation of the silicon core and polymerization reaction of the high polymer shell in one reaction solvent, thereby saving the process of purifying and washing the silicon core and replacing the reaction system, simplifying the experimental process and greatly shortening the experimental time. Besides, a distillation precipitation polymerization method, which has the advantages of simple reaction and high polymerization efficiency, is adopted to prepare the high polymer shell.

A synthetic method of a styrene/maleic anhydride alternating copolymer with low molecular weight belongs to the field of macromolecular precipitation polymerization. Media and chain transfer agents used in the existing methods for preparing styrene/maleic anhydride copolymers by precipitation polymerization have disadvantages. In the synthetic method, the styrene/maleic anhydride alternating copolymer is prepared by taking a mixed solvent of organic acid alkyl ester and alkane as a reaction medium for the precipitation polymerization, alpha-methylstyrene or vinyl acetate as a molecular weight regulator and organic peroxide or an azo compound as an initiator for initiating a copolymerization reaction between styrene monomers and styrene. The synthetic method has simple process, the synthesized copolymer has good properties, and the method has the advantages of being economical, environment-friendly and the like.

This invention provides molecularly imprinted polymer nanoparticles compatible with biological samples, and in particular pure biological samples and a preparation method thereof. Said molecularly imprinted polymer nanoparticles have a crosslinking degree exceeding 50%, a particle diameter of 10 to 500 nm, hydrophilic polymer brushes on its surfaces and can be prepared by introducing appropriate hydrophilic macromolecular chain transfer agents into reversible addition-fragmentation chain transfer (RAFT) precipitation polymerization systems through the one-pot synthesis. The preparation method is simple, features a broad range of application and yields a pure product. The obtained hydrophilic molecularly imprinted polymer nanoparticles have prospects for a wide range of application in biological sample analysis, medical clinical immune analysis, food and environmental monitoring, biomimetic sensors, etc.

The invention relates to a simple preparing method of molecularly imprinted polymeric microspheres applicable to an aqueous solution system. Crosslinking degree of the molecularly imprinted polymeric microspheres is larger than 50%, grain size of each molecularly imprinted polymeric microsphere ranges from 0.2-5 micrometers, and hydrophilic macromolecule brushes are grated on the surfaces of the molecularly imprinted polymeric microspheres. The molecularly imprinted polymeric microspheres are synthesized in one step via a reversible addition-fragmentation chain transfer (RAFT) precipitation polymerization technology induced by hydrophilic macromolecular chain transfer agent. The preparing method is simple in synthesis, wide in application range, pure in product and the like. The molecularly imprinted polymeric microspheres prepared by the method have wide application prospect in multiple fields including chromatographic support, biological sample analysis, medical clinical immunoassay, food and environmental monitoring, mimic enzyme catalysis, biomimetic sensor and the like.

The invention specifically relates to surface carboxyl-functionalized core-shell type magnetic composite microballoons and a preparation method thereof, belonging to the technical field of functional materials. According to the invention, the core of the core-shell type magnetic composite microballoons is a magnetic ferriferrous oxide nanoparticle cluster, and the shell of the microballoons is a cross-linked carboxyl-containing polymer network. The preparation method comprises the following steps: at first, preparing the citric acid stabilized magnetic nanoparticle cluster (thereafter referred as magnetic cluster for short); then, modifying the surface of the magnetic cluster with active vinyl function groups by using the sol-gel method; finally, preparing the monodisperse core-shell type magnetic polymer composite microballoons which have high magnetic responsibility and contain abundant active carboxyl groups on their surface through distillation-precipitation polymerization. A variety of bioactive molecules can be bonded with the surface of the core-shell type microballoons through chemical modification for application in the field of biomedicine. Furthermore, the method can accurately control the thickness and cross-linking degree of the shell of polymers. The invention has the advantages of simple operation and controllable process and has a good application prospect.

The invention relates to a preparation method of a polyacrylonitrile carbon fiber with an evenly distributed copolymerization sequence. The preparation method comprises the following steps: determining the number of serially connected reactors; determining the ratio of fed materials of different areas in the third co-monomer zone; carrying out precipitation polymerization by taking water as the medium, drying so as to obtain polyacrylonitrile powder; dissolving the polyacrylonitrile powder to prepare a spinning solution, removing the bubbles from the solution, filtering, spraying, and curing to form primary fibers, washing and subjecting the primary fibers to a post treatment so as to obtain polyacrylonitrile-based carbon precursor fibers; and finally subjecting the precursor fibers to pre-oxidation, carbonation, and a post treatment so as to obtain the high performance carbon fiber. The preparation method adopts multi-grade serially-connected stirred tank polymerization reactors, and raw materials are supplemented in the third co-monomer zone according to a certain ratio in different areas so as to obtain a PAN copolymer with evenly distributed copolymerization sequence. Because the distribution uniformity of the copolymerization sequence of polyacrylonitrile precursor fibers is high, the possibility that fibers with a shell-core structure appear during the pre-oxidation process is small. Moreover, the diffusion of oxygen gas in the radical direction of fibers is also promoted, thus the pre-oxidation reactions can be stably carried out and the heat dissipation can be controlled so as to obtain carbon fiber with an excellent performance.

An in situ polymer microstructure formation method. The monomer mixture is polymerized in a solvent/precipitant through exposure to ionizing radiation in the absence any chemical mediators. If an exposure mask is employed to block out certain regions of the radiation cross section, then a patterned microstructure is formed. The polymerization mechanism is based on the so-called free-radical retrograde-precipitation polymerization process, in which polymerization occurs while the system is phase separating above the lower critical solution temperature. This method was extended to produce a crosslinked line grid-pattern of poly (N-isopropylacrylamide), which has been known to have thermoreversible properties.

The invention relates to a monodisperse surface functionalized polymer microsphere resin and a preparation method thereof. The polymer microsphere resin is a gel polyene monomer homopolymer having a cross linking degree more than 30%, or a copolymer microsphere formed through a polyene monomer and a compound selected from other functional monoene monomers, and has a particle size of 300 nm to 5 [mu]m, a dispersity of 1.010-1.082. The polymer microsphere resin is prepared through a precipitation polymerization initiated through an iniferter; the microsphere surface has iniferter active groups (a content range from 0.05-0.3 mmol/g ) so as to be further subjected to surface modifications. The method provided by the present invention has characteristics of simple conditions, easy operation, cheap raw materials and controllable surface functional group content. The prepared monodisperse surface functionalized nanometer/micrometer polymer microsphere can be applicable for a filling material of a chromatographic column, drug controlled release and carriers for catalysts and bioactive molecules.

A synthetic method of a high molecular weight (HMW) alternating copolymer of styrene and maleic anhydride belongs to the high molecular precipitation polymerization field. The copolymer obtained by the current methods for preparing the copolymer of the styrene and maleic anhydride has smaller molecular weight or has higher requirements on equipments and processes. The synthetic method comprises the following steps: taking organic acid alkyl ester or mixed solvent of ketone and alkane as a polyreaction medium, taking organic peroxide or azo compound as an initiator to initiate monomer maleic anhydride to react with the styrene and obtaining the HMW alternating copolymer of styrene and maleic anhydride through precipitation polymerization. The method has simple process and simple post treatment of synthesized copolymer, and has the characteristics of being low in cost and environment-friendly, etc.

The invention relates to a method for preparing superparamagnetic microspheres with a surfactant-based nuclear shell, which comprises the following steps of: preparing monodispersed polyglycidyl methacrylate microspheres by a free radical polymerization of monomeric polyglycidyl methacrylate in the presence of an initiator and an emulsifying agent or a dispersing agent; preparing monodispersed porous polyglycidyl methacrylate microspheres with larger size by a one-step seed swelling polymerization; adding divalent and trivalent iron to stir, raising the temperature of the system, adding excessive concentrated ammonia water, and preparing monodispersed superparamagnetic microspheres in situ by an iron salt deposition and an alkaline coprecipitation method; the magnetic microspheres are subjected to surface carboxylic acid modification by distillation precipitation polymerization. The superparamagnetic microspheres with the surfactant-based nuclear shell have the advantages of good mono-dispersity, controllable magnetic content and the like, the microspheres have abundant carboxylic acid groups on the surface, and after a subsequent binding to biological ligands, and can be widely applied to the fields of biomedical analysis and detection, such as immobilized enzyme and cell separation, protein purification, immunoassay, and the like.

The invention belongs to the technical field of high molecular materials, and in particular relates to preparation of a degradable environmental sensitive polymer nano hydrogel and an application. According to the invention, the degradable multiple environmental sensitive polymer nano hydrogel is obtained through precipitation polymerization by taking N-vinyl caprolactam as a main monomer, N, N'-di(acrylyl) cystamine as a crosslinking agent as well as hydrophilic monomers such as methylacrylic acid, hydroxymethyl acrylamide, polyethylene glycol monomethyl ether metacrylic acid ester (Mw=2000) as comonomers. According to the invention, the raw materials are easily-available, and the preparation method is simple. According to the method, water is used as the solvent, so that the method is environment-friendly. The polymer nano hydrogel prepared is good in dispersibility, uniform in size, and good in stability and biocompatibility. The phase inversion temperature of the polymer can be adjusted by controlling the use levels of methylacrylic acid, N-hydroxymethyl acrylamide and polyethylene glycol monomethyl ether metacrylic acid ester and the pH value of the environment. Therefore, the hydrogel can be applied to release of medicines in fixed points and is used as a carrier for targeted release of medicines.

The invention discloses a corrosion inhibitor gel microsphere with an intelligent pH value controlled release function and its preparation method and use. A polyelectrolyte with a fast environment pH value response rate is used as a coating material and through one-step polymerization, the corrosion inhibitor gel microsphere with an environment pH controlled release function is prepared. The preparation method comprises that acrylic acid (or methacrylic acid), acrylamide (or methacrylamide) and N-N-methylene bisacrylamide (MBA) as raw materials undergo a solution deposition polymerization reaction to produce the corrosion inhibitor gel microsphere with an environment pH controlled release function. The corrosion inhibitor gel microsphere has submicron particle size, structured morphology, smooth surface, even size, good monodispersity, high drug loading amount and a fast environment pH change response rate. The corrosion inhibitor gel microsphere has wide application prospects in the fields of a corrosion system with large system pH fluctuation, self-repairing anticorrosion coating preparation and concrete reinforcement corrosion protection.

The invention discloses a magnetic nano-composite microsphere based on a cellulose base template and a preparation method and the use of the magnetic nano-composite microsphere. The magnetic nano-composite microsphere comprises a hollow poly-N-isopropyl acrylamide-polyacrylic nanocapsule and is loaded with Fe3O4 magnetic particles; and the average size of the composite microsphere is 200 to 2,000 nanometers. The preparation method comprises the following steps: a natural polymer hydroxy propyl cellulose-polyacrylic colloidal particle is taken as a template to obtain a hollow poly-N-isopropyl acrylamide-polyacrylic nanocapsule by precipitation polymerization; and then, Fe3O4 inorganic magnetic particles are loaded to the nanocapsule by an electrostatic self-assembly method and an in-site reduction method to prepare a Fe3O4/ poly-N-isopropyl acrylamide-polyacrylic magnetic nano-composite microspher. The composite microsphere has not only a certain of ferromagnetic property but also relatively high drug loading efficiency and good in-vitro release effect on water-soluble drugs, so that the composite microsphere can be applied to the field of biomedicines and biochemical engineering as a targeted drug delivery carrier.

The invention relates to a method for preparing a compound type multi-element flocculating agent aluminum ferric sulfate chloride polysilicate. The method comprises the following 4 steps of: dissolving and oxidizing; precipitation polymerization and filtering; compound polymerization; synthesis of the aluminum ferric sulfate chloride polysilicate. The method disclosed by the invention can be used for producing the compound type multi-element flocculating agent aluminum ferric polysilicate by integrally utilizing the waste sulfuric acid liquor, ferrous sulfate heptahydrate, waste aluminum slag and waste hydrochloric acid liquor of a titanium dioxide plant, a chemical plant and a steel and ion plant in a recycling way. The prepared flocculating agent can be widely applied to the treatment of domestic sewage and industrial wastewater, has higher turbidity, color and COD removing capacity compared with the treatment effect of polyaluminium chloride and polyaluminum ferric chloride and has the advantages of high floc forming velocity, large and compact floc, high sedimentation velocity and small sedimentary sludge size.