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Process for synthesis of monodisperse micron crosslinked polystyrene copolymerization microsphere

A technology for cross-linking polystyrene and polystyrene microspheres is applied in the field of preparation of new polymer materials, which can solve the problems of long time period and cumbersome preparation process.

Inactive Publication Date: 2007-02-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The seed swelling method is a common method for preparing microspheres, but this method requires multi-step reactions, a long time period, and the preparation process is cumbersome.

Method used

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  • Process for synthesis of monodisperse micron crosslinked polystyrene copolymerization microsphere
  • Process for synthesis of monodisperse micron crosslinked polystyrene copolymerization microsphere

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preparation example Construction

[0013] The object of the present invention provides a kind of synthetic method of monodisperse cross-linked polystyrene copolymer microsphere, it is characterized in that: adopt cross-linking agent PEG200DMA to replace common cross-linking agent DVB, improved the stability of reaction system, because it helps stabilizing It is conducive to the formation of monodisperse microspheres. The initiator AIBN and the cross-linking agent PEG200DMA are dissolved in the monomer styrene, and the stabilizer polyvinylpyrrolidone is dissolved in the dispersion medium ethanol for dispersion polymerization. After separation and drying, micron-sized monodisperse polystyrene microsphere powder is obtained; the process steps are:

[0014] 1) Remove the polymerization inhibitor in the styrene monomer: add 10wt% NaOH solution into the separatory funnel filled with styrene monomer in an equal volume ratio, wash the styrene monomer, vibrate and precipitate, and discard the lower layer liquid , repea...

Embodiment 1

[0021] 25g of styrene monomer, 75g of ethanol, 2.5g of polyvinylpyrrolidone, 0.25g of azobisisobutyronitrile, 0.25g of cross-linking agent PEG200DMA, pass through the ethanol solution to remove oxygen for 30min, raise the temperature to 70°C, pass constant pressure The styrene monomer solution was added dropwise into the funnel to start the reaction. After 18 hours of reaction, cross-linked microspheres with an average particle diameter of 3.15 μm can be obtained, wherein the dispersion coefficient of the particle diameter is 0.025, and the monodispersity is good.

Embodiment 2

[0023] 25g of styrene monomer, 75g of ethanol, 2.5g of polyvinylpyrrolidone, 0.25g of azobisisobutyronitrile, 0.38g of cross-linking agent PEG200DMA, pass through the ethanol solution to remove oxygen for 30min, raise the temperature to 70°C, pass constant pressure The styrene monomer solution was added dropwise into the funnel to start the reaction. After 18 hours of reaction, cross-linked microspheres with an average particle diameter of 3.26 μm can be obtained, wherein the dispersion coefficient of the particle diameter is 0.026, and the monodispersity is good.

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Abstract

This invention discloses a synthetic method of copolymerisation microballoon by monodisperse crosslinked polystyrene. It belongs to macromolecule material preparing technique field. Initiator sulphonazo biisobutyronitrile (AIBN) and crosslinking agent polyethylene glycol 200 dimethyl double acrylic acid ester (PEG200DMA) are dissolved in monomer ethenylbenzene, stabilizing agent polyethylene pyrrolidone (PVP) is dissolved in disperse medium ethanol, then crosslinked microballoon powder is got after dispersion polymerization, separation and baking. Stability of reaction system is improved by replace common crosslinking agent DVB by PEG20DMA, and monodisperse crosslinked microballoon is propitious to form by its assist stabilization. Uniform petal type monodisperse crosslinked effect microballoon is got after the crosslinking agent content up to 2.5% of the monodisperse and functional group of PEG200DMA is concentrated on microballoon surface. It can be widely used to catalyst carrier, medical treatment and medicine fields, biochemistry field and electronic message material field.

Description

technical field [0001] The invention belongs to the field of preparation of new polymer materials, in particular to a method for synthesizing monodisperse cross-linked polystyrene copolymer microspheres. technical background [0002] Polymer microspheres have special properties such as good sphericity, small size, large specific surface area, strong adsorption, enrichment of functional groups on the surface, and strong surface reaction ability. Polymer microspheres can be applied to high-tech fields, such as medical and pharmaceutical fields, biochemical fields, electronic information materials, etc. Ordinary polymer microspheres have low solvent resistance and heat resistance, which limits its application in many aspects. How to prepare cross-linked monodisperse polymer microspheres has become a hot spot in research and development. The seed swelling method is a common method for preparing microspheres, but this method requires multi-step reactions, a long time period, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F12/08C08F2/44C08G65/34
Inventor 王娟梁彤祥闫迎辉
Owner TSINGHUA UNIV