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A kind of preparation method of acid-base janus graded pore microcapsule with open structure

A technology with open structure and graded pores, which is applied in the fields of organic, inorganic and polymer materials to achieve the effects of reducing mass transfer resistance, increasing mass transfer rate, and simple and easy preparation process

Active Publication Date: 2019-05-03
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Janus materials have a wide range of potential applications in optical probes, assembly, catalysis, and particle emulsifiers, however, the preparation of selectively functionalized Janus microcapsules remains a challenge, especially the functionalization of the inner surface of the microcapsules.

Method used

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  • A kind of preparation method of acid-base janus graded pore microcapsule with open structure
  • A kind of preparation method of acid-base janus graded pore microcapsule with open structure
  • A kind of preparation method of acid-base janus graded pore microcapsule with open structure

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preparation example Construction

[0063] The preparation process of the present invention is as attached figure 1As shown, (1) by preparing linear polystyrene (LPS) template microspheres functionalized with PVP or sulfonic acid groups, and preparing core / shell composite microspheres by sol-gel process on the surface of linear polystyrene microspheres , (2) use silane coupling agent to modify the outer surface of core / shell composite microspheres with acid and alkali, (3) obtain anisotropic composite microspheres by swelling, (4) remove LPS with good solvent The template obtains the Janus hierarchical pore microcapsule with the outer surface functionalization of the open structure, (5) carry out alkaline and acidic modification on the inner surface of the microcapsule with the outer surface functionalization with a silane coupling agent to prepare a kind of microcapsule with the open structure Acid-base Janus graded pore microcapsules. The preparation process of the invention is simple, the reaction conditions...

Embodiment 1

[0067] (1) Preparation of 800nm ​​PVP functionalized linear polystyrene template microspheres

[0068] Take 90mL of water and 0.025g of polyvinylpyrrolidone (PVP) into a 500mL three-neck flask, stir for 10min, blow in argon, add 10mL of styrene monomer dropwise into the reaction system, and emulsify for 30min. Raise to 70°C, dissolve 0.1g of potassium persulfate in 10mL of water, add the potassium persulfate solution dropwise into the reaction system over 30 minutes, control the stirring speed at 180r / min, stop the reaction after 13 hours of reaction, and centrifugally settle the material , obtain linear polystyrene template microspheres with an average particle diameter of 800 nm after vacuum drying;

[0069] attached figure 2 It is an SEM photo obtained by scanning linear polystyrene template microspheres with a FEI Nano SEM 450 scanning electron microscope. It can be seen from the figure that the linear polystyrene template microspheres prepared by emulsion polymerization...

Embodiment 2

[0084] (1) Preparation of linear polystyrene template microspheres with 500nm sodium dodecylsulfonate as emulsifier

[0085] Add 240mL of water, 0.2g of sodium bicarbonate, and 0.075g of SDS into the reactor, stir for 10min, add 40mL of styrene monomer into the reaction system under the protection of argon, emulsify for 30min, raise the temperature of the system to 70°C, Dissolve 0.32g of potassium persulfate (KPS) in 60mL of water, add potassium persulfate solution dropwise into the reaction system over 30 minutes, control the stirring speed at 180r / min, stop the reaction after 13 hours of reaction, centrifugally settle the material, and vacuum dry Obtain 500nm monodisperse linear polystyrene template microspheres;

[0086] (2)LPS@SiO 2 Preparation of core / shell composite microspheres

[0087] At room temperature (25°C), soak 1g of linear polystyrene template microspheres obtained in the drying step (1) method 2 in 60mL concentrated sulfuric acid (98Wt%) for 10min, then pla...

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Abstract

The invention relates to a preparation method of an acid-alkaline Janus hierarchical pore microcapsule with an opening structure. The preparation method comprises the following steps of performing occupying modification on the outer surfaces of core / shell composite microspheres; then, swelling the core / shell composite microspheres to form the anisotropic composite microspheres with bulges, and dissolving by a good solvent to remove a template, so as to form a microcapsule with the opening structure; finally, performing different functionalizing on the inner surfaces of the microcapsules, so as to obtain the microcapsule material with the acid inner surface and the alkaline outer surface, or the alkaline inner surface and the acid outer surface. The prepared microcapsule material has excellent biological compatibility, good organic solvent-resistant property, chemical corrosion-resistant property and high mechanical stability, and has huge potential application value in the fields of micrometer-nanometer reactors, load catalyzing, cascade reaction and the like.

Description

technical field [0001] The technical solution of the present invention relates to the fields of organic, inorganic and polymer materials, in particular to a method for preparing acid-base Janus hierarchical pore microcapsules with an open structure. Background technique [0002] In recent years, microcapsules with a porous structure on the shell can be widely used in catalysis due to their competitive advantages such as low density, high specific surface area, good permeability, and fully exposed internal and external surfaces (Jiafu Shi, et al. Incorporating Mobile Nanospheres in the Lumen of Hybrid Microcapsules for Enhanced Enzymatic Activity[J].ACS Applied Materials&Interfaces,2013,5,10433-10436.), micro-nano reactors (Fuping Dong, et al.Controlled synthesis of novelcyanopropyl polysilsesquioxane hollow disphispheres loaded with Aunanoparticles for catalytic applications[J].Chemical Communications,2012,48,1108-1110), drug controlled release (Yingjie Wu, et al.Self-Propel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/06C08F112/08C08F2/26C08F8/36
CPCB01J13/06C08F2/26C08F8/36C08F112/08
Inventor 王小梅孔霞张旭
Owner HEBEI UNIV OF TECH