Method for preparing asymmetric polymer microsphere by using optically active polymer microsphere in UV light field

A photoactive polymer, polymer technology, applied in the field of preparation of functional polymer microspheres, can solve problems such as asymmetric spheres that have not yet been seen

Inactive Publication Date: 2009-05-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretically, in addition to the commonly used directional metal particle flow, the directional field can also be a light field, but there is no report on the use of light fields to prepare asymmetric spheres.

Method used

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  • Method for preparing asymmetric polymer microsphere by using optically active polymer microsphere in UV light field
  • Method for preparing asymmetric polymer microsphere by using optically active polymer microsphere in UV light field
  • Method for preparing asymmetric polymer microsphere by using optically active polymer microsphere in UV light field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091]After adopting the conventional dispersion polymerization method to react for 5 hours, within 10 to 15 minutes, add dropwise an acetone solution of 4-acrylate-based benzophenone (BPA) in the reactor (BPA accounts for 4% by mass of styrene), and continue The reaction ended after 5h. The obtained reaction solution was centrifuged, washed with methanol for 3 times, and the product was dried to obtain polystyrene (PSt) microspheres containing a hydrogen abstraction type photoinitiator benzophenone group on the surface, and the particle size of the microspheres was 1.0 μm for SEM observation and analysis. , with a coefficient of variation of 5%.

[0092] The above-mentioned monodisperse PSt microspheres were suspended and dispersed in ethanol, and the concentration of the microspheres was 4 wt%.

[0093] Drop 0.4ml of 5wt% dextrose aqueous solution onto a quartz glass sheet (20mm × 20mm × 1mm), spin coat it with 3000rpm speed for 15s on the desktop glue homogenizer, and coat...

Embodiment 2

[0097] As in Example 1: after reacting for 5 hours, add dropwise an acetone solution of 4-methacrylate-based benzophenone (BPMA) in the reactor (BPMA accounts for 6% of the mass percentage of styrene), to obtain a surface containing The hydrogen type photoinitiator PSt microsphere of benzophenone group has a particle size of 2.3 μm and a coefficient of variation of 1.3%.

[0098] The monodisperse PSt microspheres were suspended and dispersed in methanol, and the concentration of the microspheres was 5 wt%.

[0099] As in Example 1: Arranging and fixing PSt microspheres on a quartz glass substrate coated with a glucose film.

[0100] Drop 0.5ml, 10wt% polyacrylamide (PAM) aqueous solution onto the surface of the above-mentioned arrayed microspheres, and place it under a 375W high-pressure mercury lamp to illuminate for 40min with a light intensity of 55w / m 2 . After illumination, the microspheres were post-treated according to the method in Example 1 to remove unreacted PAM. ...

Embodiment 3

[0102] Prepare, arrange and fix PSt microspheres with Example 2.

[0103] Drop 0.1ml, 30wt% chitosan aqueous solution onto the arrayed microspheres, place it under a 375W high-pressure mercury lamp for 10min, and the light intensity is 100w / m 2 . After illumination, the microspheres were post-treated according to the method in Example 1 to remove unreacted chitosan. After SEM observation, the surface morphology of the modified area of ​​the microspheres was obviously different from that of the unmodified area. The microspheres can be distributed at the interface of n-hexane / water phase, the interfacial tension of n-hexane / water suspended with the modified microspheres is significantly reduced to 22 millinewtons / meter, and the obtained microspheres are amphiphilic spheres.

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Abstract

The invention provides a method for preparing asymmetric polymer microspheres in a UV optical field by using optical active polymer, which belongs to the polymerization field. The invention relates to a method for preparing the asymmetric polymer microspheres from isotropic polymer of which the surface contains optical active groups in a UV optical field. Specifically, the invention is a method for preparing the asymmetric polymer microspheres by the reaction difference of optical active groups on different area surfaces of the microspheres to light along the direction of illumination. The method has the advantages of wide applicability, high reaction speed, simple technique and equipment, less investment, high security and environment protection, and the like. Moreover, one of the most apparent characteristic of optical reaction is easy implementation of continuous operation; therefore, the method can greatly improve the preparing efficiency of asymmetric polymer microsphere.

Description

technical field [0001] The invention is a preparation method of functional polymer microspheres. The invention relates to a method for preparing asymmetric polymer microspheres from isotropic polymer microspheres containing photoactive groups on the surface in an ultraviolet (UV) light field. Specifically, the present invention is a method of selectively modifying the surface of isotropic polymer microspheres by using the difference in reactivity of photoactive groups on the surface of microspheres in different regions along the direction of UV light to prepare asymmetric polymer microspheres. microsphere method. Background technique [0002] Compared with the usual spherical and homogeneous particles, asymmetric spheres, also known as heterogeneous spheres, anisotropic spheres, and Janus particles, refer to shape, chemical composition and / or properties (including bulk properties such as mechanical properties, Particles with inhomogeneous or asymmetric distribution of phys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/00C08F2/48C08F291/00
Inventor 杨万泰刘莲英任明伟杨晓芳裴金东
Owner BEIJING UNIV OF CHEM TECH
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