Preparation method of polyaniline nano-microspheres with core-shell structure

Abstract

The invention discloses a method for preparing polyaniline nano-microspheres with a core-shell structure. The steps include: preparing monodisperse polystyrene microspheres; nitrating the polystyrene microspheres to obtain nitrated polystyrene microspheres; Aminated polystyrene microspheres are obtained after reducing nitrated polystyrene microspheres; after aniline solution is obtained by dissolving aniline in a non-polar organic solvent, the acidic aqueous solution of aminated polystyrene microspheres and initiator is added dropwise into the above-mentioned aniline solution to react to obtain polyaniline nano-microspheres with a core-shell structure. The polyaniline nano microspheres with a core-shell structure obtained by the preparation method of the invention not only have good appearance and uniform size, but also have good monodispersity, good dispersibility in water, and are not easy to agglomerate. The preparation method of the invention is simple, the conditions are mild, there is no metal ion interference, the reproducibility is good, and the practicability is strong.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a method for preparing polyaniline nano-microspheres with a core-shell structure. Background technique [0002] Polyaniline (PANI for short) is an important conductive polymer in polymer materials, and occupies an important position in conjugated conductive polymer materials. PANI molecule is a linear conjugated polymer connected head to tail, its structure is composed of reduction unit (y unit) and oxidation unit (1-y unit), the y value in the formula is used to characterize the redox degree of PANI, in The oxidation unit contains a quinone structure, and different y values ​​correspond to different structures, components, colors and conductivity. It can be seen from the structural formula that the transformation from an insulator to a conductor can be realized by introducing substituent groups on the molecular chain of PANI or introducing different ions through protonic acid d...

AI Technical Summary

Problems solved by technology

Although polyaniline with these morphologies has good electrochemical properties, there are still some problems, such as the preparation process is more complicated, and the process route is not easy to control; the prepared PANI material can have better electrochemical properties only when it is combined with other materials. ; and problems such as poor water solubility

[0004] In order to solve the above-mentioned technical problems, the synthesis of polyaniline microspheres has also become a focus of research this year. As the application number is 200710304102.2, the Chinese patent uses polystyrene (Polystyrene, be called for short PS) microspheres as a synthetic template, and iron nitrate (Fe( NO 3 ) 3 ), ferric chloride (FeCl 3 ) etc. as an oxidant, invented polystyrene / polyaniline conductive polymer composite microspheres with a core-shell structure. Although this technology can obtain polyaniline microspheres with better morphology, the introduction of metal elements will affect the electrical conductivity of the material. chemical properties

The Chinese patent with the application number 201110403637.1 prepared a polyaniline nanosphere with a diameter of 50-200nm by using a mixed solution of water and ethanol. Although a good shape can be obtained, the size distribution is not uniform and the water solubility is poor.

Huang Bin et al. (Functional Materials, 2011, 42(1), 144-147), used the template method to prepare PANI hollow microspheres with PS colloidal particles as microsphere cores, and applied them to ESC electrode materials. Its electrochemical performance in the field of energy storage, although this kind of hollow microsphere has good electrochemical performance, but from the picture of the scanning electron microscope, there are still problems such as uneven size

The Chinese patent with the application number 201510852325.7 synthesized sulfonated polystyrene / polyaniline composite microspheres with sulfonated polystyrene (SPS for short) as the core and polyaniline as the shell. Although the problem of water solubility was solved, the Poor conductivity

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