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Preparation of monodisperse porous polymer microsphere

A porous polymer and monodisperse technology, which is applied in the field of preparation of monodisperse porous polymer microspheres, can solve the problem of limited second monomer content and achieve the effect of improving stability

Active Publication Date: 2009-05-20
芜湖万隆新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Winnik et al proposed to add the second monomer after the nucleation of the particles to avoid the nucleation period and reduce the influence of the second monomer on the nucleus. This improvement plays a certain role, but the content of the second monomer is relatively limited

Method used

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  • Preparation of monodisperse porous polymer microsphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Preparation of monodisperse porous polymer PSD microspheres

[0020] (1) Configure an aqueous ethanol solution of 0.25wt% sodium dodecylsulfonate, the ethanol water is a solvent, and the ethanol:water mass ratio is 5:1 to obtain a dispersion;

[0021] (2) Take 25g of dispersion liquid, add 0.5g of polystyrene seed microspheres, and ultrasonically disperse for 5-20min to obtain seed emulsion;

[0022] (3) Take 25g of the dispersion, add 0.5g of 1-chlorododecane as a swelling aid, and disperse ultrasonically for 10 to 60 minutes to obtain a swelling aid emulsion;

[0023] (4) Mix the dispersed seed emulsion and swelling aid emulsion, place in a four-port reactor equipped with mechanical stirring, reflux condenser, nitrogen conduit, and thermometer, and swell at 30°C and 120rpm for 8 to 24 hours; The first step is swelling to obtain the activated seed emulsion;

[0024] (5) Take 40g of dispersion, add 4g of styrene, 2g of divinylbenzene, 0.06g of dibenzoyl ...

Embodiment 2

[0028] Embodiment 2: the preparation of monodisperse porous polymer PSDM microsphere

[0029] (1)-(4) are the same as Example 1

[0030] (5) Add 3.6g styrene, 1.8g divinylbenzene, 0.6g methyl methacrylate, 0.06g dibenzoyl peroxide, 2g toluene, 2g n-heptane to 40g dispersion liquid, and ultrasonically disperse for 30min to obtain Mixed monomer, initiator, porogen emulsion;

[0031] (6)-(8) are the same as Example 1, that is, obtain 4.1 μm monodisperse porous polymer PSDM microspheres.

Embodiment 3

[0032] Embodiment 3: the preparation of monodisperse porous polymer PSDA microsphere

[0033] (1)-(4) are the same as Example 1

[0034] (5) Take 40 g of the dispersion and add 5 g of styrene, 3 g of divinylbenzene, 2 g of acrylonitrile, 0.1 g of dibenzoyl peroxide, and 10 g of toluene. Ultrasonic dispersion for 30 minutes to obtain mixed monomer, initiator and porogen emulsion;

[0035] (6)-(8) are the same as Example 1, that is, obtain 3.7 μm monodisperse porous polymer PSDA microspheres.

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Abstract

The invention provides a preparation method of a monodisperse porous polymer microsphere. After a second stage of swelling of two-stage seed swelling polymerization, remnant monomer separation technology is adopted to avoid the aggregation of the microspheres and the generation of secondary particles, thereby greatly improving the stability of preparing monodisperse porous polymer microsphere through the two-stage seed swelling polymerization. The two-stage seed swelling polymerization can stably prepare the following monodisperse porous polymer microspheres: P(St-co-DVB) (PSD for short) and P(St-co-DVB-co-MMA) (PSDA for short), wherein, St is referred to as styrene, DVB as divinybenzene, MMA as methyl methacrylate, AN as acrylonitrile and co as copolymerization. The monodisperse porous polymer microsphere PSDA prepared by the method can be seen in an attached drawing.

Description

technical field [0001] The invention relates to a method for preparing monodisperse porous polymer microspheres, in particular to a method for preparing porous microspheres through two-step seed swelling polymerization. technical background [0002] Size-controllable monodisperse porous polymer microspheres are widely used in the fields of chromatographic column packing, ion exchange resin, bioseparation and catalyst support. There are many preparation methods of porous microspheres, such as suspension polymerization, dispersion polymerization, seed swelling polymerization, SPG membrane emulsification method, etc. Suspension polymerization can prepare porous microspheres with a particle size of 10-100 μm. This method is relatively simple and easy to prepare. However, the size and size distribution of oil droplets in suspension polymerization are controlled by stirring speed. Since the size of oil droplets is very uneven, Therefore, the particles obtained by suspension polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F2/00C08J9/28C08L25/08C08F212/36C08F220/44
Inventor 周光远雷金化
Owner 芜湖万隆新材料有限公司
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