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Preparation method of polyaniline nanotubes

A technology of polyaniline and nanotubes, which is applied in the field of high value-added and high-performance preparation of nanomaterials, can solve problems such as unsatisfactory electrical conductivity, weak product shape control, and heavy metal ion wastewater, so as to achieve abundant reserves and reduce Generation cost, effect of increasing surface activity

Active Publication Date: 2013-04-03
CHANGZHOU UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Chinese patent CN 102504531A proposes a polyaniline nanotube prepared by doping with sulfosalicylic acid; Marija Radoicic et al. .Met.2010,160,1325-1334.] in Nano TiO 2 In the presence of colloidal particles, polyaniline nanotubes were prepared by self-assembly. However, the disadvantage of this method is that the shape control of the product is weak and the yield is not high.
Chinese patent CN100497761C discloses a kind of MnO 2 nanofibers or β-MnO 2 Nanotubes are used as templates, and polyaniline nanotubes are controllably prepared by self-ablation of templates. However, this method prepares polyaniline in the presence of sulfuric acid, which has unsatisfactory electrical conductivity, relatively high cost, and is prone to heavy metal ion wastewater.

Method used

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  • Preparation method of polyaniline nanotubes
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Disperse 5.0 kg of sepiolite in 16.7 kg of deionized water, add 0.25 kg of acrylic acid monomer, add 0.05 kg of ammonium persulfate at a system temperature of 50°C, stir, keep the temperature for 0.5 hours, and keep the system temperature At 0°C, add 1.5 kg of aniline, while stirring, add 8.0 liters of ferric chloride solution with a concentration of 4.0 mol / liter, react for 6 hours, filter with suction, and dry at 90°C to obtain a sepiolite / polyaniline composite material , The measured volume resistivity was 10.0Ω·cm.

[0023] 2. Disperse the composite material prepared in step 1 in a hydrofluoric acid solution with a mass percent concentration of 40% so that the mass ratio of the silicate clay / polyaniline composite material to the acid solution is 0.5, let stand for 1 hour, and pump Filter, wash until the filtrate has a pH value of 3, dry at 60° C., and pulverize to obtain polyaniline nanotubes. The measured volume resistivity is 6.4 Ω·cm.

Embodiment 2

[0025] 1. Disperse 2.0 kg of attapulgite in 40.0 kg of deionized water, add 0.3 kg of methacrylic acid monomer, and add 0.015 kg of ammonium persulfate at a system temperature of 100°C, stir, keep warm for 2 hours, and keep The temperature of the system is 30°C, add 2.0 kg of aniline, and while stirring, add 10.0 liters of potassium dichromate solution with a concentration of 1.0 mol / liter, react for 1 hour, filter with suction, and dry at 50°C to obtain attapulgite / polyaniline Composite material, the measured volume resistivity is 5.7Ω·cm.

[0026] 2. the composite material that step 1 is made is dispersed in the hydrofluoric acid solution that mass percent concentration is 10% so that the mass ratio of silicate clay / polyaniline composite material and acid solution is 1.1, stand for 12 hours, pump Filter, wash until the pH of the filtrate is 5, dry at 80° C., and pulverize to obtain polyaniline nanotubes. The measured volume resistivity is 2.4 Ω·cm.

Embodiment 3

[0028] 1. Disperse 5.0 kg of wollastonite in 25.0 kg of deionized water, add 0.4 kg of methacrylic acid monomer, and add 0.4 kg of ammonium persulfate at a system temperature of 65°C, stir, keep warm for 1.5 hours, and keep The temperature of the system is 20°C, add 4.0 kg of aniline, and while stirring, add 14.3 liters of potassium iodate solution with a concentration of 3.0 mol / liter, react for 4 hours, filter with suction, and dry at 80°C to obtain a wollastonite / polyaniline composite The material has a measured volume resistivity of 4.6Ω·cm.

[0029] 2. The composite material prepared in step 1 is dispersed in a hydrofluoric acid solution with a mass percentage concentration of 30% to make the mass ratio of the silicate clay / polyaniline composite material to the acid solution be 0.8, leave it to stand for 5 hours, and pump Filter, wash until the filtrate has a pH value of 3.5, dry at 70° C., and pulverize to obtain polyaniline nanotubes. The measured volume resistivity is ...

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Abstract

The invention provides a preparation method of polyaniline nanotubes. The preparation method comprises the steps of: firstly, taking rodlike silicate clay as a nuclear body, conducting surface initiated polymerization to coat polyacrylic acid, and then conducting oxidative polymerization to coat polyaniline, thereby preparing silicate clay / polyaniline composite; and finally dissolving the rodlike silicate clay with hydrofluoric acid, and then conducting duel-doping to polyaniline to obtain conductive polyaniline nanotubes. Polyacrylic acid coated on the surface of the silicate clay has two aspects of advantages that the surface activity of the silicate clay is increased and polyaniline can be easily adsorbed on the surface; polyacrylic acid can play a role in doping polyaniline, so that an acid is not needed to be additionally added into a polyaniline synthesis system; the hydrofluoric acid applied not only can remove a silicate clay template to produce the polyaniline nanotubes, but also can further improve the conductivity of the polyaniline nanotubes; the silicate clay selected as the template has the advantages of no need of painstakingly conducting artificial synthesis, low cost and the like; and the production cost can be further lowered.

Description

technical field [0001] The invention relates to a method for preparing polyaniline nanotubes using natural rod-shaped or fibrous silicate clay as a template, and belongs to the fields of high added value of inorganic non-metallic minerals and high-performance preparation of nanomaterials. Background technique [0002] Polyaniline has the advantages of convenient synthesis, low cost, high conductivity and environmental stability, and is used in many fields such as supercapacitors, electromagnetic wave shielding, antistatic and anti-corrosion, especially polyaniline nanotubes, which have become more and more popular in recent years. received extensive attention from researchers. At present, the preparation of polyaniline nanotubes mainly includes self-assembly method and template method. Chinese patent CN 102504531A proposes a polyaniline nanotube prepared by doping with sulfosalicylic acid; Marija Radoicic et al. .Met.2010,160,1325-1334.] in Nano TiO 2 In the presence of c...

Claims

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Application Information

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IPC IPC(8): C30B29/58C30B29/62C08L79/02C08G73/02
Inventor 姚超左士祥陈群刘文杰纪俊玲孔泳魏科年罗士平王茂华
Owner CHANGZHOU UNIV
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