45results about How to "The polymerization method is simple" patented technology

The invention discloses a method for preparing special aromatic polyoxadiazole and flame-retardant high-temperature resistant polyoxadiazole fiber thereof. The special aromatic polyoxadiazole is prepared by the following method that the special aromatic polyoxadiazole is prepared from terephthalic acid, compound of which the structural general formula is expressed as formula I and hydrazine salt serving as monomers through condensation polymerization reaction. The polyoxadiazole fiber with high flame retardancy and high temperature resistance is prepared by using the special aromatic polyoxadiazole as a raw material. The fiber number of the prepared polyoxadiazole fiber is 1 to 20 dtex, the breaking strength is 2.5 to 5 cN.dtex-1, the elongation at break is 10 to 40 percent, the initial modulus is 50 to 250 cN.dtex-1, the moisture regain is 5.0 to 12.0 percent, the limited oxygen index is 30 to 38 percent, and the initial decomposition temperature is above 480 DEG C. The fiber can be widely used in the fields of protective products, filter materials, electric insulating materials, frictional sealed materials, various industrial textiles, high-temperature resistant paper, aviation and aerospace materials and the like.

The invention belongs to the technical field of carbon nanotube fibers, and particularly relates to carbon nanotube/macromolecular composite fibers and a preparation method thereof. The preparation method comprises the following steps of: infiltrating the carbon nanotube fibers into acrylic acid monomer solution, and performing topochemical polymerization. In the preparation method, the tensile strength and conductivity of the composite fibers are measured, and the mechanical and electrical properties of the carbon nanotube/polyacrylic acid composite fibers are studied by comparing the composite fibers with pure carbon nanotube fibers. The influence of the monomer concentration of precursor solution and the crosslinking degree of macromolecules on the mechanical strength of the composite fibers is studied further. The oriented carbon nanotube/macromolecular composite fibers have high mechanical strength and conductivity, the preparation method is simple, and a new path is provided forthe preparation of carbon nanotube fiber reinforced materials.

The invention belongs to the field of materials for lithium ion batteries, and discloses a nitrogen-doped carbon-coated manganous-manganic oxide composite material, as well as a preparation method andapplication thereof. The preparation method comprises the steps of dissolving manganese acetate and ammonium bicarbonate into ethylene glycol, carrying out solvent heat treatment at the temperature of 180 to 220 DEG C, and obtaining manganese carbonate; reacting with dopamine hydrochloride, and obtaining a manganese carbonate/polydopamine composite material; then calcining under an inert atmosphere, and finally oxidizing in a muffle furnace to obtain the nitrogen-doped carbon-coated manganous-manganic oxide composite material. The preparation method provided by the invention is simple and lowin cost; the prepared nitrogen-doped carbon-coated manganous-manganic oxide composite material is stable in structure and good in electrical conductivity, and has excellent rate performance and cyclic stability when being used as a lithium ion battery cathode material.

The present invention relates to the field of olefin polymerization, and discloses a catalyst system, which comprises a titanium-containing solid catalyst component, an alkyl aluminum compound and an external electron donor compound, wherein the titanium-containing solid catalyst component comprises at least two internal electron donor compounds such as a diol ester compound and a carboxylic acid ester, and the external electron donor compound is the combination of an ether ester compound and alkyl dialkoxysilane. The present invention further provides applications of the catalyst in olefin polymerization reactions. According to the present invention, when the solid catalyst component using the diol ester compound and the carboxylic acid ester as the internal electron donors is subjected to the olefin polymerization reaction, the compounding of the ether ester compound and the alkyl dialkoxysilane is added and used as the external electron donor used in the olefin polymerization reaction, such that the catalyst can maintain the high activity, and the melt index of the obtained polymer can be improved.

The invention relates to the field of olefin polymerization and discloses application of an external electron donor containing an ether ester compound as shown in a formula (I), i.e., R<5>-O-R<4>(R<3>(COOR<1>)COOR<2>), to an olefin polymerization reaction. Moreover, the invention also discloses a catalyst containing the ether ester compound as shown in the formula (I) and application of the same to the olefin polymerization reaction. According to the invention, the ether ester compound is applied as the external electron donor to the olefin polymerization reaction, and in particular, a composition of the ether ester compound and a dialkoxysilane compound is applied to the olefin polymerization reaction; so the catalyst can maintain high activity and has improved hydrogen response, a finally prepared polymer has high activity and isotacticity, and a polymerization method is simple.

A polymethylacrylic acid higher ester pour point depressant has polymerization reaction formulas shown in the formula (I) and the formula (II) defined in the specification. A preparation method comprises the steps: a synthetic asymmetric double-Schiff alkali metal complex (nickel system, copper system and other post-transition metal complexes) as a main catalyst, a catalytic system is formed fromthe complex and azodiisobutyronitrile or benzoperoxide, and methacrylate higher ester monomers are catalyzed to undergo a polymerization reaction to produce the polymethylacrylic acid higher ester polymer under certain conditions. The polymethylacrylic acid higher ester polymer prepared by the method has a certain pour point depressing effect on diesel distillates or lubricating oil fractions andis used as a pour point depressant for diesel or lubricating oil.

The invention discloses a soluble benzenetetracarboxylic diimide group-containing full-conjugated polymer and a preparation method thereof. The structural formula of the full-conjugated polymer is as the follow, wherein R1 is alkyl, R2 is hydrogen or trifluoromethyl, and n is more than or equal to 1. The preparation method comprises: adopting dibromobenzene tetracarboxylic diimide and 1,4-diethynylbenzene or a derivative of the 1,4-diethynylbenzene are adopted as monomers, and a copolymerization reaction is performed under a Heck reaction condition to obtain the full-conjugated polymer. Compared to the prior art, the polymer of the present invention has the following advantages that: the strong electron-deficient benzenetetracarboxylic diimide group is introduced in the molecule of the polymer, such that the polymer has low HUMO energy level, and the electrophilic capacity of the polymer is strong; the triple bond is introduced in the polymer, such that the steric hindrance between the donor unit and the receptor unit is reduced, the polymer is regularly aligned, and the electron mobility rate of the field effect transistor device containing the polymer of the present invention can be improved, therefore, wide application prospects are provided for the fields of polymer field effect transistors, thin film transistors and the like.

The invention discloses an amphipathic nucleobase functionalized cellulose polymer, a micelle and a preparation method thereof, and relates to the technical field of preparation of a polymer material.The polymer has a structure as shown in a formula (I), wherein Nu is (as shown in description), x, y and n are integers, x is more than or equal to 10 and less than or equal to 100, y is more than orequal to 20 and less than or equal to 200, n is more than or equal to 200 and less than or equal to 1200, and R is (as shown in description) or H or a polymer chain. The amphipathic nucleobase functionalized cellulose polymer has the following beneficial effects: a grafted copolymer is formed by polymerizing biocompatible cellulose, a nucleobase monomer or an N,N-dimethylacrylamide monomer; and the amphipathic nucleobase functionalized cellulose polymer micelle has high storage stability and has high biocompatibility and biodegradability.

The present invention relates to an olefin polymerization method, which is characterized in that an olefin, a Ziegler-Natta spray drying catalyst, an assistant catalyst, a halohydrin and a molecular weight regulator are combined in a slurry phase. With the method, the polymerization activity of the catalyst and the bulk density of the polymer are effectively increased.

The invention provides a temperature-pH responsive molecularly-imprinted fiber membrane and a preparation method thereof, belonging to the field of polymer functional materials. The preparation method of the temperature-pH responsive molecularly-imprinted fiber membrane comprises the following steps: preparing a nanofiber membrane from chitosan by using an electrostatic spinning technology, and then grafting a temperature responsive polymer poly(N-isopropylacrylamide-co-N-tert-butylacrylamide)-co-methacrylic acid on the surface of the nanofiber membrane through a free radical polymerization reaction. A prepared material has specific recognition capacity on dyes or heavy metal ions, the maximum adsorption capacity of the material on gentian violet dyes reaches 212.0 mg/g, adsorption equilibrium time is 7 min, and an desorption rate reaches 97%. The morphology of the fiber membrane is kept in a solution with a pH value of 6.0-14.0; the fiber membrane is dissolved in a solution with a pH value of 1.0-6.0; the molecular chain of a polymer brush is hydrophilic and is stretched when the temperature is lower than 32.5 DEG C; and the molecular chain is curled up and separated out from water when the temperature is higher than 32.5 DEG C. After adsorption is finished, pollutants can be easily and rapidly separated out due to temperature and pH responsiveness, so effective removal and enrichment of the pollutants are realized. The fiber membrane has a good application prospect in the aspects of environmental protection and water quality detection and analysis.

The invention discloses an aminocarbazole/aniline copolymer and a synthesis method thereof. The synthesis method comprises the following steps: dissolving 3-amino-9-ethylcarbazole and aniline in different mol ratios in a first solvent to form a comonomer solution; dissolving a certain amount of oxidant in a second solvent to form an oxidant solution; and after blending the oxidant solution and the comonomer solution, shaking intensely for some time, standing, and reacting completely to obtain the aminocarbazole/aniline copolymer. The invention has the advantages of simple synthesis steps, high efficiency and high controllability; and the obtained carbazole/aniline conducting polymer can be used in the fields of electrodes, electron screening, electrostatic prevention, electrochromic materials, fluoroscopic examination and the like.

The invention relates to a norbornene, hexafluoropropylene and 2,5-dihydro-2,5-dimethoxy furan ternary polymerization method. The norbornene, hexafluoropropylene and 2,5-dihydro-2,5-dimethoxy furan ternary polymerization method is characterized by comprising the following steps: adding polymerization monomer norbornene, hexafluoropropylene and 2,5-dihydro-2,5-dimethoxy furan into a high-pressure kettle in a molar ratio being 1 to 1 to 1, and adding a solvent to dissolve; adding an initiator, reacting for 1-4 hours at a temperature being 0-150 DEG C under pressure being 1-3 MPa, wherein the initiator is prepared from di-tert-butyl peroxide and tert-butyl peroxyacetate in a molar ratio being (0.1:1) to (1:0.1), and dose of the initiator accounts for 0.1%-1.5% of the total weight of the polymerization monomer; pouring the product obtained by reaction into an alcohol containing solution, washing obtained precipitates with alcohol, and vacuum-drying to obtain the norbornene, hexafluoropropylene and 2,5-dihydro-2,5-dimethoxy furan ternary polymer.

The invention relates to a preparation method and application of a highly selective chlorsulfuron magnetic molecularly imprinted polymer. When preparing the molecularly imprinted polymer, magnetic graphene oxide is used as a carrier, chlorsulfuron is used as a template, and it is prepared based on the self-polymerization of dopamine in an alkaline environment. Compared with the traditional method for preparing molecularly imprinted polymers, the method of the present invention does not need to introduce biotoxic cross-linking agents and initiators, and the entire synthesis is carried out in aqueous solution at ambient temperature, which is environmentally friendly. The obtained magnetic molecularly imprinted polymer has remarkable selective recognition performance for chlorsulfuron, higher adsorption capacity, faster equilibration time and desorption rate. As an adsorbent material, it is applied to the specific identification, efficient separation and enrichment of sulfonylurea herbicide residues in grain samples under the condition of external magnetic field. At the same time, the polymer material can be recycled many times, which reduces the detection cost and has good practical application value.