Method for preparing nano spherical polyelectrolyte brush

A polyelectrolyte brush and spherical technology, which is applied in the field of preparation of nano-spherical polyelectrolyte brushes, can solve the problems of difficult industrialization of nano-spherical polyelectrolyte brushes

Inactive Publication Date: 2012-06-27
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the technical defect that photoemulsion polymerization is not easy to industrialize the preparation of nano-spherical polyelectrolyte brushes, and provide a new method for directly utilizing industrial polybutadiene latex to prepare nano-spherical polyelectrolyte brushes with core-shell structure through surface copolymerization modification

Method used

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  • Method for preparing nano spherical polyelectrolyte brush
  • Method for preparing nano spherical polyelectrolyte brush

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 300 grams of polybutadiene emulsion (the measured solid content is 2%, particle diameter is 312 nanometers), add 0.12 grams of potassium persulfate (2% of the polybutadiene emulsion solid content). Pump nitrogen 3 to 5 times, raise the temperature to 80°C, add 6 grams of acrylic acid monomer (100% of the solid content of the polybutadiene emulsion) dropwise quickly, and complete the polymerization after 0.5 hours. The average particle size of the spherical polyelectrolyte brushes was measured to be 612 nm (pH = 5) after dialysis in deionized water using a dialysis bag with a molecular weight cut-off of 14,000.

Embodiment 2

[0017] Take 300 grams of polybutadiene emulsion (the measured solid content is 2%, particle diameter is 312 nanometers), add 0.12 grams of potassium persulfate (2% of the polybutadiene emulsion solid content). Pump nitrogen 3 to 5 times, raise the temperature to 80°C, quickly drop 4.5 g of acrylic acid monomer (75% of the solid content of the polybutadiene emulsion) dropwise, and complete the polymerization after 0.5 hours. The average particle size of the spherical polyelectrolyte brushes was measured to be 513 nm (pH = 5) after dialysis in deionized water using a dialysis bag with a molecular weight cut-off of 14,000.

Embodiment 3

[0019] Take 300 grams of polybutadiene emulsion (the measured solid content is 2%, particle diameter is 312 nanometers), add 0.12 grams of potassium persulfate (2% of the polybutadiene emulsion solid content). Pump nitrogen 3 to 5 times, raise the temperature to 80°C, quickly drop 3 grams of acrylic acid monomer (50% of the solid content of the polybutadiene emulsion) dropwise, and complete the polymerization after 0.5 hours. The average particle size of the spherical polyelectrolyte brushes was measured to be 477 nm (pH = 5) after dialysis in deionized water using a dialysis bag with a molecular weight cut-off of 14,000.

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Abstract

The invention relates to a novel method for preparing a nano spherical polyelectrolyte brush. The method can be used for preparing the spherical polyelectrolyte brush with the particle size of 200 to 600 nanometers by using polybutadiene emulsion particles with the particle sizes of 110 to 320 nanometers as cores and utilizing rich double bonds on the surfaces of the polybutadiene emulsion particles through carrying out copolymerization on the polybutadiene emulsion particles and added electrolyte monomers such as acrylic acid, sodium styrene sulfonate and the like under the initiation of an initiator. The polyelectrolyte brush can be applied to the fields of concentration and adsorption of metal ions with positive electricity and counter ions with negative electricity in water, preparation of nano metal particles by the in-situ reduction reaction, immobilization of a biological enzyme, separation of proteins and the like.

Description

technical field [0001] The present invention relates to a polymer preparation method and its application, specifically a new method of preparing a nano-spherical polyelectrolyte brush through surface copolymerization modification using an industrial polymer latex and applying it to concentrate and absorb positively charged water Metal ions or negatively charged counter ions, preparation of nano metal particles by in situ reduction reaction, immobilized biological enzymes, and separation of proteins and other fields. Background technique [0002] When the polymer chains are fixed at a certain interface with one end and densely arranged, their free ends will stretch out to form a brush-like structure due to the volume repulsion effect, that is, polymer brushes. This polymer brush structure can greatly change surface properties, such as adhesion, lubricity, wettability, friction, biocompatibility, etc., and has broad application prospects in many fields. If charged polymer bru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F279/02C08F220/06C08F212/14C12N11/08C07K1/14B22F9/24
Inventor 郭旭虹朱元清赵世方李公生许军李莉房鼎业
Owner EAST CHINA UNIV OF SCI & TECH
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