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Method for synthesizing nonspherical polymer microparticles

A synthesis method and polymer technology, applied in the field of non-spherical polymer microparticle synthesis

Inactive Publication Date: 2012-07-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest problem with the above methods is that the shape of colloidal particles is limited to spherical or spherical variants (round cake, hemisphere, core-shell, etc.), and other special shapes are difficult to achieve (triangular, multi-legged, etc.)

Method used

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  • Method for synthesizing nonspherical polymer microparticles
  • Method for synthesizing nonspherical polymer microparticles
  • Method for synthesizing nonspherical polymer microparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Synthesis of meniscus-shaped polymer particles using figure 1 chips shown, see the actual figure 2 , use a syringe pump to continuously perfuse mineral oil into reservoir A1, continuously perfuse 33% PEGDA aqueous solution (containing 4% tween20 and 1.5 mg / ml photoinitiator) into reservoir B2, and continuously perfuse Fc40 into reservoir C3 (containing 2% EA); oil-in-water droplets (mineral oil / 33% PEGDA aqueous solution) continuously formed at position i, and flowed along the channel through position ii, forming a mononuclear double emulsion at position ii (mineral oil / 33% PEGDA aqueous solution / Fc40); when the formed double emulsion flows through the ultraviolet lamp irradiation area, the 33% PEGDA aqueous solution undergoes a polymerization reaction to form a gel (see image 3 and Figure 4 ); due to the quenching effect of oxygen on free radicals, the polymerization reaction of PEGDA at the Fc40 interface was inhibited, forming an unpolymerized thin layer, resu...

Embodiment 2

[0038] The synthesis of polymer microparticles with many-legged morphology adopts the method described in Example 1 to adjust the flow velocity of the internal phase, the middle phase and the external phase to form triple-nuclear, quadri-nuclear and penta-nuclear double emulsions respectively (see Figure 8 (a)-(c)), under UV light, polymer microparticles with uniform distribution of tripods, tetrapods and pentapods were formed (see Figure 8 (d)-(j)).

Embodiment 3

[0040] Synthesis of magnetic polymer microparticles and investigation of their magnetic response, PEGDA, magnetic nanoparticle aqueous solution (9.2% Fe 3 o 4 ) and pure water according to the ratio of 4:2:4 (volume ratio) to make a solution of 10 ml, add Tween20 (4%) and photoinitiator (final concentration is 1.5 mg / ml), the mixed solution is used as the intermediate phase, the internal Phase and external phase are mineral oil and Fc40 (containing 2% EA) respectively, according to the method described in embodiment 1, form non-spherical magnetic polymer microparticles (see Figure 9 (a)). The elemental analysis spectrum shows that the polymer microparticles contain Fe (see Figure 9 (b)), and the magnetic microparticles have a magnetic response and can be attracted by a magnet (see Figure 9 (c)). The synthesized magnetic polymer microparticles are dispersed on the interface of water and Fc40, and then a parallel external magnetic field is applied, and the magnetic polyme...

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Abstract

The invention provides a method for synthesizing nonspherical hydrogel microparticles. In a first stage, oil-in-water droplets are formed by adopting a T-channel structure; and in a second stage, oil / water / oil double emulsion is formed by adopting a flow focusing structure. Under the irradiation of ultraviolet light, the intermediate phase of the double emulsion is polymerized to form the hydrogel microparticles, and polymerization reaction on an interface of an external phase and the intermediate phase is suppressed, so that hydrogel cannot wrap internal-phase oil cores, and the hydrogel microparticles taking the internal-phase oil cores as templates are formed. The method has the advantages that: the volume velocity ratio of the internal phase to the intermediate phase is controlled to form a series of hydrogel microparticles with similar shapes; the number of internal cores of single double emulsion is controlled to form hydrogel microparticles with different shapes such as meniscal shapes and polypod shapes; additives in a monomer solution are controlled to form hydrogel microparticles with special functions such as fluorescence and magnetism; and compared with microparticles formed by a photoetching method, the microparticles formed by the method have three-dimensional shape structures.

Description

technical field [0001] The invention relates to the synthesis technology of non-spherical polymer microparticles, and particularly provides a non-spherical polymer synthesis method based on double emulsion as a template. Background technique [0002] Compared with spherical particles, anisotropic polymer colloidal particles have a large surface-to-volume ratio, high-efficiency light diffusion, strong scattering, and rheology. Their potential applications include the synthesis of materials with special crystal structures, molecular interactions or Pattern systems for atomic crystals, flat panel displays, high-density filling, etc. [0003] At present, the existing methods for preparing non-spherical colloidal particles mainly include: "bottom up" method based on molecular nucleation and growth, photolithography, spherical particle stretching method, and template-assisted method. In general, these methods can synthesize particles with special morphology, but the synthesis pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08F2/22C08F2/48C08F2/44
Inventor 秦建华张清泉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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