Method for preparing surface functionalized polymer microspheres

A technology of polymer microspheres and surface functionalization, which is applied in the field of preparation of polymer microspheres, can solve the problems of strong radiation, large heat release, inconvenient operation, etc., and achieves the effects of safe operation, simple equipment and convenient operation.

Inactive Publication Date: 2012-01-04
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in the synthesis process and subsequent application. First, the heat release of the reaction is large, the radiation is strong, the operation is inconvenient, and it is not safe. Second, the polymers prepared by ultraviolet light are currently The lack of some specific functional groups on the surface of microspheres limits the subsequent application of microspheres

Method used

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  • Method for preparing surface functionalized polymer microspheres
  • Method for preparing surface functionalized polymer microspheres
  • Method for preparing surface functionalized polymer microspheres

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preparation example Construction

[0025] A method for preparing surface-functionalized polymer microspheres, comprising the following steps:

[0026] 1) Add the azo compound initiator and dispersant to the mixed solvent with a volume ratio of ethanol and water of 1:1-1.5, and disperse fully by ultrasonic to obtain a solution;

[0027] 2) Add functional monomers to the solution obtained in step 1), and disperse fully by ultrasonic to obtain a solution;

[0028] 3) The solution obtained in step 2) was irradiated with an 8W ultraviolet lamp for 24-36 hours to initiate the reaction. After the reaction, the emulsion product was centrifuged, poured off the supernatant, added deionized water, and blown the bottom white precipitate with a dropper. Disperse, make it redisperse, centrifuge and wash again, pour off the supernatant. The washing process is repeated for 5-6 times, and the washed microspheres are redispersed in deionized water and stored in the form of a suspension to obtain surface-functionalized polymer m...

Embodiment 1

[0032] Take 0.2g of azobisisobutyronitrile and 1.05g of polyvinylpyrrolidone in a 150mL Erlenmeyer flask, add 25mL of absolute ethanol and 25mL of deionized water, and ultrasonically oscillate for 12min to obtain a homogeneous solution, then add 5mL of methacrylic acid methyl ester and 0.5 g of acrylamide, and then continue to sonicate for 15 min, and finally seal the Erlenmeyer flask, and irradiate it with an 8W ultraviolet lamp for 24 h under the action of magnetic stirring. After the reaction, the emulsion product was centrifuged at a speed of 3500 rpm for 15 minutes. After pouring off the supernatant, deionized water was added and the bottom white precipitate was blown away with a dropper to redisperse it, and then centrifugally washed. Pour off the supernatant. Repeat the washing process, wash 6 times, redisperse the washed microspheres in deionized water, and store them in the form of suspension, so that the P(MMA-co-AM) microspheres with amide groups on the surface are ...

Embodiment 2

[0034] Weigh 0.2067g of azobisisobutyronitrile and 1.03g of polyvinylpyrrolidone into a 150mL Erlenmeyer flask, add 20mL of absolute ethanol and 30mL of deionized water, and ultrasonically oscillate for 20min to obtain a homogeneous solution, then add 1.25mL of formazan methyl acrylate and 0.106 mL of methacrylic acid, and then continue to sonicate for 5 minutes, and finally seal the conical flask, and irradiate it with an 8W ultraviolet lamp for 24 hours under the action of magnetic stirring. After the reaction, the emulsion product was centrifuged at a speed of 3000 rpm for 15 minutes. After pouring off the supernatant, deionized water was added and the white precipitate at the bottom was blown away with a dropper to redisperse it, and then washed by centrifugation. Pour off the supernatant. The washing process was repeated for 5 times, and the washed microspheres were redispersed in deionized water and stored in the form of a suspension.

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Abstract

The invention discloses a method for preparing surface functionalized polymer microspheres, which is characterized by comprising the following steps of: 1) adding an initiator and a disperser into a solvent, and fully dispersing to obtain a solution; 2) adding functional monomer into the solution obtained in the step 1), and fully dispersing to obtain a solution; and 3) irradiating the solution obtained in the step 2) by using ultraviolet, initiating reaction, obtaining emulsion after the reaction is finished, separating the emulsion, removing supernate, and washing to obtain the surface functionalized polymer microspheres. The preparation method has the advantages that: the generated heat is a little, an additional cooling device is not needed, the operation is simple and convenient, equipment is simple, radiation on a human body is absent basically, and the operation is safe. The prepared microspheres have uniform grain size, have functional groups on the surfaces, and can be used for inducing and synthesizing monodisperse semiconductor nanoparticles such as CdS, ZnS and the like.

Description

technical field [0001] The invention relates to a preparation method of surface-functionalized polymer microspheres. Background technique [0002] Polymer microspheres have excellent properties such as large surface area, strong adsorption, and strong surface reaction ability, and are widely used in the fields of template synthesis, standard measurement, ink, biochemistry, and chromatographic packing. At present, there are many methods for preparing polymer microspheres, such as suspension polymerization, emulsion polymerization, dispersion polymerization, and precipitation polymerization. However, most polymerization initiation methods use heating, and devices such as nitrogen protection, heating and cooling have become indispensable additions. Ultraviolet light initiation is an effective room temperature initiation method, which has the advantages of low energy efficiency, safety, environmental protection, and strong operability. It has been reported in the synthesis of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/56C08F220/06C08F220/18C08F2/48C08F2/04B01J13/14
Inventor 孙丰强黄臻询李健鹏吴春松古凯源
Owner SOUTH CHINA NORMAL UNIVERSITY
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