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Method for preparing quaternary ammonium salt surface-modified monodisperse polystyrene microsphere emulsion

A polystyrene microsphere and surface modification technology, which is applied in the field of preparation of monodisperse polystyrene microsphere emulsion, can solve problems such as difficulty in monomer grafting, and achieve the effect of good monodispersity and good particle size uniformity

Active Publication Date: 2014-09-10
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the purposes of the present invention is to address the defect that styrene and dimethyl diallyl ammonium chloride are difficult to graft, introduce a third monomer as a bridging segment during the polymerization process, and use secondary feeding And a semi-continuous polymerization method, changing the reaction temperature of the initiation stage and the polymerization stage, and controlling the reaction to proceed smoothly, thereby providing a kind of monodisperse polystyrene microsphere emulsion of quaternary ammonium salt surface modification directly in the water phase Preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 5.0g of styrene and 60.0g of distilled water into the reactor, stir and mix evenly, add 0.15g of methyl methacrylate under stirring, ventilate with nitrogen, add 0.30g of potassium persulfate; react at a temperature of 85°C After 50 minutes, add 10.0g mass fraction and be 60% dimethyl diallyl ammonium chloride aqueous solution, then continue to react for 8 hours at a temperature of 75° C.; stop heating and cool to room temperature under stirring to obtain quaternary ammonium Monodisperse Polystyrene Microsphere Emulsions Surface-Modified by Salt. The particle diameter of the monodisperse polystyrene microspheres constituting the monodisperse polystyrene microsphere emulsion modified by the surface of the quaternary ammonium salt is 150 nm.

Embodiment 2

[0025] Add 6.0g of styrene and 57.0g of distilled water into the reactor, stir and mix evenly, add 0.3g of methyl methacrylate under stirring, ventilate with nitrogen, add 0.20g of potassium persulfate; react at a temperature of 82°C After 30 minutes, add 8.0g mass fraction and be 60% dimethyl diallyl ammonium chloride aqueous solution, then continue to react for 12 hours at a temperature of 75° C.; stop heating and cool to room temperature under stirring to obtain quaternary ammonium Monodisperse Polystyrene Microsphere Emulsions Surface-Modified by Salt. The particle diameter of the monodisperse polystyrene microspheres constituting the monodisperse polystyrene microsphere emulsion modified by the quaternary ammonium salt surface is 220nm.

Embodiment 3

[0027]Add 7.0g of styrene and 54.0g of distilled water into the reactor, stir and mix evenly, add 0.4g of methyl methacrylate under stirring, ventilate with nitrogen, add 0.035g of potassium persulfate; react at a temperature of 80°C After 30 minutes, add 7.5g mass fraction and be the dimethyl diallyl ammonium chloride aqueous solution of 60%, then continue to react for 18 hours at a temperature of 73° C.; stop heating and cool to room temperature under stirring to obtain quaternary ammonium Monodisperse Polystyrene Microsphere Emulsions Surface-Modified by Salt. The particle size of the monodisperse polystyrene microspheres constituting the monodisperse polystyrene microsphere emulsion modified by the surface of the quaternary ammonium salt is 450nm.

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Abstract

The invention relates to a method for preparing a quaternary ammonium salt surface-modified monodisperse polystyrene microsphere emulsion. The quaternary ammonium salt surface-modified monodisperse polystyrene microsphere emulsion is prepared by introducing a hydrophilic functional monomer and changing the feeding ratio of styrene to water, so as to achieve effective control on the monodisperse polystyrene microsphere. The method comprises the following steps: by taking styrene as a main monomer, dimethyl diallyl ammonium chloride as a functional monomer, methyl methacrylate as a third monomer, potassium peroxodisulfate or ammonium persulfate as an initiator and water as a reaction medium, preparing the polystyrene microsphere with quaternary ammonium salt gathered on the surface by adopting a soap-free emulsion polymerization method in a semi-continuous manner. No surfactant, organic solvent or inorganic salt is added in the preparation process; the method is simple in preparation technology and low in cost; the particle size of the obtained quaternary ammonium salt surface-modified monodisperse polystyrene microsphere can be flexibly controlled between 150nm and 600nm by regulating the dosage ratio of the initiator to the three monomers.

Description

technical field [0001] The invention relates to the field of polymer material synthesis, in particular to a preparation method of a monodisperse polystyrene microsphere emulsion modified on the surface of a quaternary ammonium salt. Background technique [0002] Surface-functionalized polymer microspheres have received more and more attention because they can be widely used in many fields, such as biochemistry and biomedicine, pharmaceuticals, chromatographic column packing, and clinical testing. So far, polymer microspheres containing different functional groups have been reported, including carboxyl groups (Song J S, Leonid C, Mitchell A, Monodisperse Micrometer-Size Carboxyl-Functionalized Polystyrene Particles Obtained by Two-Stage Dispersion Polymerization, Macromolecules, 2006, 39 :5729-5737), amino (Wang Weicai, Zhang Qi, Zhang Bingbo, etc., preparation of monodisperse superparamagnetic fluorescent PGMA multifunctional microspheres by amination, Science Bulletin, 2007...

Claims

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Application Information

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IPC IPC(8): C08F257/02C08F226/02C08F212/08C08F220/14C08F2/22
Inventor 谷岩闫丰文袁国卿郭存悦
Owner INST OF CHEM CHINESE ACAD OF SCI
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