Method for preparing polyaniline without emulsified Nano granule

Abstract

This invention relates to preparation methods for polyaniline nano-particles. The preparation method for nonemulsified polyaniline nano-particles introduced by this invention is that: aniline and aniline-sulfonic acid derivatives are added into acid media to produce monomer solution; oxidants are added into acid media to produce oxidant solution; oxidant solution is dropped into monomer solution and polymerization is initiated and held up until thorough reaction. It is characteristics of this invention that the preparation method is quite simple and no extra additive such as emulsifiers or dispersants is necessary, by which additive removal for products can be avoided. It provides a new path for the synthesis of polyaniline nano-particles and solves the molding problems of insoluble polyaniline. The yield of sulfonic polyaniline nano-particles is 80.4%, the electric conductivity is 0.56S / cm and the diameter is 11~300nm. They are applicable in preparation of antistatic membranes, coatings, corrosion resistant coatings and electromagnetic shielding coatings.

Description

technical field [0001] The invention belongs to the technical field of preparation of conductive macromolecule nanomaterials, in particular to a preparation method of polyaniline nano particles under the condition of no external additives. Background technique [0002] Polyaniline prepared by traditional methods is insoluble and can only be dissolved in a few highly polar solvents. The processing performance is very poor, which greatly limits the development of its industrial application. Therefore, the preparation of processable polyaniline has become the research target of many scientists. The introduction of the nano concept in the field of conductive polymer materials has brought new vitality to the processing and application of polyaniline. Polyaniline nanomaterials integrate their electrical conductivity and nanomaterial surface effects, small size effects and quantum effects. Excellent The characteristics make it have a broader application prospect. However, the nan...

AI Technical Summary

Problems solved by technology

Sometimes it is necessary to add an organic solvent as a dispersion medium in the inverse microemulsion polymerization method, which not only greatly increases the cost but also causes environmental pollution.

What's more fatal is that the existence of a large number of emulsifiers in the microemulsion polymerization system makes the resulting product complex and often requires complicated post-processing (such as: demulsification, filtration, washing, product collection, etc.), and the product is difficult to purify. Affect the physical and mechanical properties of the product

Dispersion polymerization is also commonly used to prepare polyaniline nanoparticles, but many factors such as the concentration of aniline monomer, the concentration and type of stabilizer, reaction temperature, stirring speed, reaction time, medium, initiator type and concentration, etc. Particle size and its particle size distribution have a significant impact, the resulting polyaniline particles are relatively large, it is difficult to obtain real nano-polyaniline

Like microemulsion polymerization, there is also the disadvantage that the added macromolecular stabilizer is difficult to remove

As for the polyaniline nanoparticles prepared by the electrochemical method, only specific nanocomposites can be obtained. At the same time, due to the limitation of the electrode area, it is difficult to obtain a large amount of polyaniline nanoparticles, which is not suitable for large-scale industrial production.

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