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 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 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.