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Method for preparing monodisperse polystyrene microsphere with controllable grain diameter

A technology of polystyrene microspheres and monodispersity, applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., can solve problems such as uneven particle size distribution, and the method is simple and easy, The effect of low purity and simple reaction equipment

Inactive Publication Date: 2008-10-29
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the particle size of polystyrene microspheres can be controlled by controlling the reaction time, the problem is that the particle size distribution is not very uniform

Method used

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  • Method for preparing monodisperse polystyrene microsphere with controllable grain diameter
  • Method for preparing monodisperse polystyrene microsphere with controllable grain diameter
  • Method for preparing monodisperse polystyrene microsphere with controllable grain diameter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Commercially available styrene (analytically pure, Beijing Chemical Reagent Company) was washed 3 times with 5wt% sodium hydroxide (analytical pure, Beijing Chemical Reagent Company) aqueous solution to remove the polymerization inhibitor in the raw material styrene, and then washed with pure water Wash several times until the solution is neutral, dry with a small amount of anhydrous calcium chloride, and store at low temperature until use. Put 100 milliliters of deionized water into a single-necked round-bottomed flask (placed in a water bath), this single-necked round-bottomed flask is placed in a water-bathed pot, and magnetically stirred (about 300rpm / min), take the above-mentioned rough-treated polystyrene 13 milliliters, put into above-mentioned one-necked flask, get a certain amount of stabilizing agent polyvinylpyrrolidone (PVP) as table 1, also put into above-mentioned one-necked flask, stir to make it mix evenly, about 10 minutes. Put 0.3 g of potassium persul...

Embodiment 2

[0040] Effect of the amount of styrene monomer on the particle size of polystyrene microspheres. As shown in Table 2, in experiments No. 1 to No. 4, under the condition of keeping other experimental conditions the same as in Example 1, polyvinylpyrrolidone was selected as 0.5 g, and the amount of styrene monomer was gradually increased from 10 mL to 19 mL. The particle size of the microspheres does not change very much, the maximum difference is 60nm, and the change trend is not obvious. The morphology of the prepared polystyrene microspheres is as follows: image 3 As shown in the scanning electron microscope pictures (a) to (c) in , the monodispersity is relatively not very good.

[0041] Table 2 The effect of monomer styrene content on the particle size of polystyrene microspheres

[0042]

[0043] *Mass percentage wt% is the mass ratio of styrene mass to water

Embodiment 3

[0045] Effect of the amount of initiator potassium persulfate on the particle size of polystyrene microspheres. As shown in table 3, in No. 1 to No. 4 tests, under the same situation of keeping other test conditions and embodiment 1, keep the consumption of each experiment stabilizer polyvinylpyrrolidone to be 0.5g, the consumption of initiator potassium persulfate Gradually increasing from 0.2g to 0.5g, although the particle size of polystyrene microspheres does not change very much, it gradually becomes smaller, showing obvious regularity as Figure 4 As shown, the maximum gap is 26nm, and the morphology of the prepared polystyrene microspheres is as follows Figure 5 As shown in the scanning electron microscope pictures (a) to (c) in , it has good monodispersity.

[0046] The impact of table 3 KPS initiator dosage on polystyrene microsphere particle size

[0047]

[0048] *Mass percentage wt% is the mass ratio of potassium persulfate to styrene

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Abstract

The invention belongs to the technology field of nanometer materials preparation, particularly relates to a preparation method of monodisperse polystyrene microspheres capable of controlling the particle size of the polystyrene microspheres within a certain range by changing the use amount of a stabilizer. The invention prepares polystyrene microspheres with simply purified styrene as a monomer, potassium persulfate as an initiator, water as a reaction medium and polyvinylpyrrolidone as a stabilizer by using soap-free emulsion polymerization. The preparation method uses electromagnetic stirring instead of electric stirring; and has the advantages of relatively low requirements for the uniformity of stirring speed, no need of surfactant, simple process, and low cost. The obtained polystyrene microspheres have good monodispersity, and the particle size thereof can be controlled within the range of 250-1,400nm by changing the use amount of the stabilizer. The monodispersed polystyrene microspheres have important application value as a module or template in construction of photonic crystals, inorganic / organic nanometer composite materials and hollow micrometer / nanometer spheres.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a controllable preparation method for realizing monodisperse polystyrene microspheres within a certain particle size range by changing the amount of a stabilizer. Background technique [0002] Emulsion polymerization is widely used in the synthesis of polymer materials, but due to the residual emulsifier in the final product of general emulsion polymerization, the water resistance and surface smoothness of polymer materials are greatly reduced. Simultaneously, the presence of emulsifiers also pollutes the environment. The soap-free emulsion polymerization method just overcomes the above shortcomings, and can obtain high-purity, monodisperse, and narrowly distributed polymer microspheres, which are widely used in clinical medicine, material science, cytology, and chromatographic separation. Therefore, soap-free emulsion polymerization has been highly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F112/08C08F2/00C07C15/46C07C7/00
Inventor 贺军辉杜鑫
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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