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

The invention discloses spherical polybutylene-1 with high isotacticity and a preparation method thereof as well as a catalyst used by the method. The method comprises the following steps: catalyzing the polymerization of a butene-1 monomer body to polymerize by using a loaded ziegler-giulio natta spherical catalyst system, wherein hydrogen is a molecular weight adjustor; adding an electron donor compound; implementing temperature-gradient polymerization in a temperature range from -10 DEG C to 50 DEG C, wherein polybutylene-1 suspends in the reaction system in form of spherical particles; and flashing to recover unpolymerized monomers to obtain spherical polybutylene-1. Spherical polybutylene-1 with high isotacticity can be obtained by adjusting the partial pressures of the electron donor and hydrogen, wherein the isotacticity is greater than 95%, the isotacticity is greater than 0.30g / cm<3> and the isotacticity is 0.1-30g / 10min. The catalyst used in the method consists of a carrier, an active component, the electron donor and a promoter.

The invention relates to the field of synthesis of a high polymer material and aims to provide a preparation method of polymonosulfo-carbonate with a regular chain structure. The preparation method comprises the following steps of: adding epoxide, carbonyl sulfide, a catalyst and a catalyst promoter to a dry high-pressure reaction kettle, reacting for 0.5 hour -12.0 hours under self pressure at 0 DEG C-80 DEG C; and purifying and drying to obtain polymonosulfo-carbonate. The catalyst adopted by the preparation method disclosed by the invention has very high catalytic efficiency, and the method which is provided by the invention is different from a ring opening polymerization method for synthesizing polymonosulfo-carbonate in a controllable manner. The polymerization method is simple and easy to operate, and capable of accurately adjusting the polymer structure by adjusting the reaction conditions. The polymonosulfo-carbonate provided by the invention can be used more extensively; and the obtained product has a higher refractive index, for example, the COS-PO copolymer has the refractive index of 1.63, which is remarkably higher than that of the common copolymer, and therefore, the preparation method has a potential application to special optical materials such as adhesives.

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 discloses cross-linked polymer antibacterial nano latex particles and a preparation method thereof. The preparation method comprises the following steps: establishing a free-radical copolymer system anticipated by hydrophobic monomer styrene, cationic methacrylate-quaternary ammonium salt monomer MAQAC6 and divinyl benzene by adopting an one-pot method, and successfully preparing soap-free cross-linked polymer nano emulsion with antibacterial property by virtue of a simple and efficient method, wherein the particle size is small and narrow in distribution, and the problems that the particle size of the latex particles is increased due to the excessive consumption of quaternary ammonium salt monomer and the stability of the emulsion is reduced can be avoided. The cross-linked polymer antibacterial emulsion does not need to be after-treated and can be directly used for resisting bacteria, the soap-free emulsion prepared by adding the quaternary ammonium salt monomer is proved to have good antibacterial property for the escherichia coli, the research achievement has positive significance for preparing soap-free nano antibacterial emulsion which can be directly used, and the application potential in the aspect of the antibacterial paint and the like is considerable.

The invention relates to the field of olefin polymerization, and discloses a catalyst system. The catalyst system comprises a titaniferous solid catalyst component, an aluminum alkyl compound and an external electron donor compound, wherein the titaniferous solid catalyst component contains at least two internal electron donor compounds of a polytrimethylene terephthalate type compound and a diether type compound, and the external electron donor compound is an ether base ester compound or a combination of the ether base ester compound and hydroxyl silane dialkyl oxygen radicals. The invention further provides application of the catalyst in olefin polymerization reaction. According to the catalyst system and the application of the catalyst in the olefin polymerization reaction, by adding the ether base ester compound or the combination of the ether base ester compound and the hydroxyl silane dialkyl oxygen radicals as the external electron donors to be used in the olefin polymerization reaction when the solid catalyst component with the polytrimethylene terephthalate type compound and the diether type compound being the internal electron donors is subjected to the olefin polymerization reaction, not only can the catalyst maintain high activity, but also sensibility of hydrogen regulation of the catalyst can be improved.

The invention relates to the field of olefin polymerization, and discloses a catalyst system. The catalyst system comprises a titanium containing solid catalyst component, an aluminium alkyl compound and an external electron donor compound; the titanium containing solid catalyst component comprises at least two kinds of internal electron donor compounds, which contain a diol ester type compound and a carboxylate compound; and the external electron donor compound is an ether ester compound. The invention also provides an application of the catalyst to the olefin polymerization. The solid catalyst component which comprises the diol ester type compound and the carboxylate compound as internal electron donors is used for carrying out the olefin polymerization, and the ether ester compound is used for the olefin polymerization, so that high polymerization activity of the catalyst is maintained, and at the same time hydrogen response of the catalyst is improved.

The invention belongs to the technical field of preparation and application of materials with conductive functions, and in particular relates to conductive polymer polyaniline doped with silicon dioxide and its preparation method and application. The present invention utilizes the coagulation characteristic of sol, adopts the oxidation polymerization method to prepare polyaniline particles doped with silicon dioxide; the weight percentage concentration of silicon dioxide contained in conductive polymer polyaniline is 10-30%, and the weight percentage concentration of polyaniline is 10-30%. 70-90%. Polyaniline doped with silicon dioxide is spherical, filamentous or needle-like in shape, and is an electrode material, microelectronic technology material, antistatic and shielding material. The method of the invention not only has low energy consumption, simple process, good product dispersibility, and the morphology of polyaniline doped with silicon dioxide can be controlled by means of reaction conditions.

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 method for adjusting and controlling the maximum critical mutual solubility temperature of zwitterionic polymers through terminal group modification. Zwitterionic polymers are obtained by polymerizing functional RAFT reagents. The UCST of carboxyl-terminated polymers can be regulated by pH; the ester-terminated polymers The UCST has increased substantially. The zwitterionic monomer is called 3-(2-methacryloyloxyethyl dimethylamino) propanesulfonate (DMAPS), and its polymer is called PDMAPS, and the molar ratio of DMAPS and RAFT reagent in the polymer system is n: 1 (n=80-500); ECT is carboxyl-terminated RAFT reagent 4-cyano-4-(((ethylthio)carbonyl)thio)pentanoic acid. This end group modification method solves the problem that the zwitterionic polymer has a single response and the UCST is difficult to improve, and is expected to be applied in fields that are sensitive to pH environments such as water treatment and drug carriers.