A kind of preparation method of nano cationic spherical polyelectrolyte brush

Abstract

The invention discloses a method for preparing a nano cationic spherical polyelectrolyte brush. The method sequentially comprises the following steps of: 1, preparing monodisperse nano silicon dioxide microspheres; 2, preparing silicon dioxide microspheres of which the surfaces are provided with unsaturated double bonds; and 3, preparing the nano cationic spherical polyelectrolyte brush by adopting a dispersion polymerization method. The method is simple and easy to operate, the process is easy to control and the method is suitable for industrial production; and the cationic spherical polyelectrolyte brush prepared by the method has the grafting ratio of 2.4-17.9 percent, the weight-average molecular weight of 3.23*10<2>-7.173*10<4>g / mol and the grafting density of 3.345*10<-7>-5.54*10<-4>mol / g. The product prepared by the method has high grafting density.

Description

technical field

[0001] The invention relates to a preparation method of a polymer, in particular to a preparation method of a nano cationic spherical polyelectrolyte brush. Background technique

[0002] Polymer brush refers to a special homopolymer or copolymer polymer system formed by connecting one end of the polymer molecular chain to the surface of the substrate with high density. When the molecular chain density of the branched polymer grafted on the surface is high enough, the chain segments are forced to extend perpendicular to the surface of the substrate due to the steric hindrance effect to avoid overlapping each other, so that the entire polymer molecule forms a brush-like structure. configuration. As a unique polymer system, polymer brushes have been widely used in catalysis, colloidal stability, organic-inorganic composites, chemical valves, and biocompatibility. If charged polymer brushes are introduced on the surface of nanoscale particles, the formed nanosp...

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