Users' questions

How polyaniline acts as a conducting polymer?

How polyaniline acts as a conducting polymer?

Although one of the oldest polymers, polyaniline has only recently been looked upon as a promising conducting polymer. Polyaniline can be made conductive by partial oxidation of the fully reduced (leucoemeraldine base) form or by partial protonation of the half oxidized (emeraldine base) form.

How polyaniline is synthesized?

1. Polyaniline (PANI) synthesis. PANI was synthesized by oxidative polymerization using 0.1 M anilinium hydrochloride (ANHC) in 1 M HCl and ammonium peroxydisulfate (APS) as oxidant agent (equimolar to aniline). PANI base was then filtered out and dried under dynamic vacuum oven at 50 °C during 8 h [44].

How do you make polyaniline conductive?

Emeraldine base is regarded as the most useful form of polyaniline due to its high stability at room temperature and the fact that, upon doping with acid, the resulting emeraldine salt form of polyaniline is highly electrically conducting.

How is synthesis conducting polymers?

Most conductive polymers are prepared by oxidative coupling of monocyclic precursors. Such reactions entail dehydrogenation: n H–[X]–H → H–[X]n–H + 2(n–1) H+ + 2(n–1) e. The low solubility of most polymers presents challenges.

What are conducting polymers give example?

Examples include polyacetylene, poly(p- phenylene vinylene) (PPV), polythiophene, polypyrrole and polyaniline grafted derivatives (Ferraro, 1987). Polyacetylene derivatives: soluble poly(methylacetylene) and poly(phenylacetylene) have been synthesized (Yoshino, 1997).

What are the applications of conducting polymers?

Table 1.

conducting polymer synthesis technique applications
poly(3,4-ethylenedioxythiophene) (PEDOT) electrochemical and chemical synthesis biosensors, antioxidants, drug delivery, neural prosthetics

Is PVC a conducting polymer?

Product components, the largest conductive polymer application, accounted for 57% of all conductive polymer applications in 2005. …

What is the Colour of polyaniline?

For doped polyaniline, or as you said in acidic condition, polyaniline exists in emerladine salt form, which is green in color.

Why is polypyrrole conductive?

PPy is an insulator, but its oxidized derivatives are good electrical conductors. The conductivity of the material depends on the conditions and reagents used in the oxidation. Conductivities range from 2 to 100 S/cm. Higher conductivities are associated with larger anions, such as tosylate.

What are the examples of conducting polymer?

What is the classification of conducting polymers?

Conductive polymer/Classification

Is PVA a conducting polymer?

There are many types of conductive polymer coatings such as Polyaniline (PANi), polyvinyl alcohol/polyvinyl pyrrolidone (PVA/PVP) and polypyrolle. Polyaniline (PANi) is the most popular conductive polymer due to its high conductivity properties among polymer and it also has reversible acid/base characteristic.

Why is the electrical conductivity of polyaniline important?

Electrical conductivity of polyaniline is a very important parameter and it could be modified by the addition of inorganic fillers [17]. Additionally, electrical conductivity of polyaniline depends on dopant ions [18], [19], [20].

What is the oxidative method for polyaniline nanocomposites?

Polyaniline (PANI) based nanocomposites filled with ZnO nanorods were prepared by the chemical oxidative method of the aniline in acid medium with ammonium peroxydisulphate (APS) as an oxidant.

How to prepare polyaniline by in situ emulsion?

A series of CSA-doped polyaniline (PANI) latex was synthesized via in situ emulsion polymerization. A typical procedure to prepare the CSA-doped PANI is given as follows: 0.003 mol (0.704 g) of CSA was mixed with 0.05 mol (4.5 g) of aniline monomer in 200 mL of distilled water for 2 h.

How are polyaniline nanofiber sensors fabricated in a lab?

Polyaniline nanofiber sensors can be fabricated by irradiating an aqueous precursor solution containing aniline, HCl, a metal salt, and ammonium persulfate (APS) with a high pressure Hg lamp. The sensors are ready for operation after polymerization is complete, and no additional processing steps are necessary.