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Method for preparing nano cationic spherical polyelectrolyte brush

A technology of polyelectrolyte brushes and cations, which is applied in the field of preparation of nano-cation spherical polyelectrolyte brushes, can solve problems such as difficulty in increasing graft density and easy formation of steric hindrance, and achieves simple and easy-to-operate methods, easy-to-control processes, and high graft density. The effect of branch density

Inactive Publication Date: 2012-06-20
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of "grafting to the surface" refers to grafting the prepared polymer chain with reactive groups at the end to the surface of the microsphere through reaction. After a certain amount of chain segments are grafted on the surface of the microsphere, the long The chain segment is easy to form steric hindrance, so it is difficult to increase the grafting density by this method

Method used

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  • Method for preparing nano cationic spherical polyelectrolyte brush

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Step 1, using the sol-gel method to prepare monodisperse nano-silica microspheres:

[0030] The preparation method of monodisperse nano-silica microspheres refers to the literature: Kota Sreenivasa Rao, et al. Journal of Colloid and Interface Science 2005; 289:125-131, and the obtained mass fraction is 4% nano-silica isopropanol Suspension, wherein the average particle size of silica microspheres is 100nm.

[0031] Step 2, preparing silica microspheres with unsaturated double bonds on the surface:

[0032] Add 40mg of γ-methacryloxypropyltrimethoxysilane (KH-570) to 100ml of alcohol-water mixture to obtain a reaction system. The volume ratio of alcohol and water in the alcohol-water mixture is 10:1, and the Adjust the pH of the reaction system to 4, and hydrolyze the obtained reaction system at room temperature for 1 hour; add 20 g of the nano-silica isopropanol suspension obtained in step 1 to the hydrolyzed reaction system, and reflux under the condition of a 70°C wa...

Embodiment 2

[0037] Step 1, using the sol-gel method to prepare monodisperse nano-silica microspheres:

[0038]The preparation method of monodisperse nano-silica microspheres refers to the literature: Kota Sreenivasa Rao, et al. Journal of Colloid and Interface Science 2005; 289:125-131, and the obtained mass fraction is 4% nano-silica isopropanol Suspension, wherein the average particle size of silica microspheres is 50nm.

[0039] Step 2, preparing silica microspheres with unsaturated double bonds on the surface:

[0040] Add 40mg of γ-methacryloxypropyltrimethoxysilane (KH-570) to 100ml of alcohol-water mixture to obtain a reaction system. The volume ratio of alcohol and water in the alcohol-water mixture is 3:1, and the Adjust the pH of the reaction system to 3, and hydrolyze the obtained reaction system at room temperature for 1 hour; add 20 g of the nano-silica isopropanol suspension obtained in step 1 to the hydrolyzed reaction system, and reflux under the condition of a water bath...

Embodiment 3

[0045] Step 1, using the sol-gel method to prepare monodisperse nano-silica microspheres:

[0046] The preparation method of monodisperse nano-silica microspheres refers to the literature: Kota Sreenivasa Rao, et al. Journal of Colloid and Interface Science 2005; 289:125-131, and the obtained mass fraction is 4% nano-silica isopropanol Suspension, wherein the average particle size of silica microspheres is 90nm.

[0047] Step 2, preparing silica microspheres with unsaturated double bonds on the surface:

[0048] Add 24mg of γ-methacryloxypropyltrimethoxysilane (KH-570) to 100ml of alcohol-water mixture to obtain a reaction system. The volume ratio of alcohol and water in the alcohol-water mixture is 10:1, and the Adjust the pH of the reaction system to 4, and hydrolyze the obtained reaction system at room temperature for 1 hour; add 20 g of the nano-silica isopropanol suspension obtained in step 1 to the hydrolyzed reaction system, and reflux under the condition of a 70°C wat...

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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...

Claims

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Application Information

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IPC IPC(8): C08F292/00
Inventor 黎厚斌苏娜易生平刘兴海黄驰
Owner WUHAN UNIV
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