Preparation method of spherical polyelectrolyte brush and use thereof

A polyelectrolyte brush, spherical technology, applied in the field of medical diagnosis, can solve the problems of unsuitable monomer, unfavorable industrial production, expensive and other problems

Inactive Publication Date: 2009-03-11
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, we found that there are still some problems in the existing photoemulsion polymerization method, such as many monomers are not suitable for photo

Method used

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  • Preparation method of spherical polyelectrolyte brush and use thereof
  • Preparation method of spherical polyelectrolyte brush and use thereof
  • Preparation method of spherical polyelectrolyte brush and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 Preparation of Nanopolymer Microemulsion Balls by Redox Emulsion Polymerization

[0016] Put 150ml of deionized water, 0.4g of sodium dodecylsulfonate, and 4.0g of potassium persulfate into a 500ml three-neck flask. After fully dissolving, 9.8 g of styrene was added. Pump nitrogen 3 to 5 times, and control the speed at 300 rpm. After the temperature rose to 40°C, 1.5g of sodium bisulfite was dissolved in 50ml of deionized water, and quickly dropped into the flask. During the reaction process, the temperature and rotation speed were kept constant, and the polymerization reaction ended after 6 hours.

Embodiment 2

[0017] Example 2 Preparation of Nanopolymer Microemulsion Balls by Redox Emulsion Polymerization

[0018] Put 150ml of deionized water, 0.6g of sodium dodecylsulfonate, and 6.0g of potassium persulfate into a 500ml three-neck flask. After fully dissolving, 9.4 g of methyl methacrylate was added. Pump nitrogen 3 to 5 times, and control the speed at 400 rpm. After the temperature rose to 35°C, 2.3g of sodium bisulfite was dissolved in 50ml of deionized water, and quickly dropped into the flask. During the reaction process, the temperature and rotation speed were kept constant, and the polymerization reaction ended after 4 hours.

Embodiment 3

[0019] Example 3 Preparation of polymer microemulsion spheres coated with thermal initiator

[0020] Take Example 1. At the end of the redox emulsion polymerization, slowly add 0.5 g of the thermal initiator dropwise into the reaction system, and the dropping speed is controlled at 8 drops / min. After the dropwise addition, the reaction was continued for 8 hours. The obtained emulsion was put into a dialysis bag and then dialyzed in deionized water, and the deionized water was replaced 5 to 8 times until the ionic strength of the deionized water no longer changed. The particle size of the polymer emulsion particles changed little before and after coating, and the average particle size was 57.4nm measured by dynamic light scattering.

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Abstract

The invention relates to a novel method for preparing a nano spherical polyelectrolyte brush by utilizing a thermal initiator and application thereof. Firstly, styrene and other substances are used as a monomer, and are subjected to oxidation reduction emulsion polymerization at normal temperature to obtain a micro milk globule of polystyrene(PS) with the grain diameter of between 50 and 90 millimeters; secondly, at the final stage of the polyreaction, an azo thermal initiator is added, because a C=C double bond of the end group of the thermal initiator and a surface residual monomer of the micro milk globule are subjected to copolymerization, the thermal initiator is fixed on the surface of the micro milk globule through the covalent bond; and finally, an electrolyte monomer such as acrylic acid, sodium styrene sulfonate and the like is added to initiate the polymerization at certain temperature, and the nano spherical polyelectrolyte brush with the grain diameter of between 100 and 200 millimeters is prepared. The polyelectrolyte brush can be widely applied to fields such as the removal of harmful metallic ions in water, the recovery of precious metal ions, the preparation of nano metal composite catalysts and biological enzyme reactor, the medical diagnosis.

Description

technical field [0001] The present invention relates to a polymer preparation method and its application, specifically a new method for preparing a nano-spherical polyelectrolyte brush using a thermal initiator and applying it to the removal of harmful metal ions in water, the recovery of precious metal ions, and the use of nano-metal Preparation of composite catalysts and bio-enzyme reactors, as well as medical diagnosis and other fields. Background technique [0002] When many polymer chains are fixed on a solid surface with one end and densely arranged and assembled together, due to the volume repulsion effect, their free ends will be stretched outwards to form a brush-like structure, the so-called polymer brushes. Because such polymer brush structures can greatly modify surface properties, such as adhesion, lubricity, wettability, friction, biocompatibility, etc., they have broad application prospects in many fields. [0003] If charged polymer brushes (i.e. nano-spher...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F257/02C08F265/02C08F265/04C08F4/04C08F2/24C08F222/22C02F1/62
Inventor 郭旭虹李莉许军王翔房鼎业
Owner EAST CHINA UNIV OF SCI & TECH
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