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

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.

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 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.