How do you synthesis polyaniline?
Polyaniline (PANI) was synthesized by chemical oxidation process by using Ammonium per sulphate (APS) as oxidizer and HCl as dopant.
Is the aniline polymerization exothermic or endothermic why?
Oxidation of aniline is an exothermic process and can easily be followed by temperature changes. We used a strong oxidant (ammonium persulfate), which has an oxidation potential of 2.01 V and is capable of oxidizing all intermediates of PANI synthesis. The reaction shown by Scheme 5 proceeded under ambient conditions.
What is polyaniline used for?
Polyaniline (PANI) is an intrinsically conductive polymer used in various applications, including drug delivery, photovoltaic cells, plastic batteries, display devices, microelectronics, chemically modified electrodes, corrosion protection, and polymer light-emitting diode (PLED) displays due to its specific properties …
What are the properties of polyaniline?
Polyaniline PANI
- wide and controllable range of conductivity.
- melt and solution processable material.
- conductive blends with many commodity polymers.
- function as processing aids in addition to providing conductivity.
- coloured and transparent electrically conductive products.
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 polyaniline used?
application of polyaniline in corrosion protection of metals and alloys is very important subject. The motivation for application of polyaniline in corrosion protection stems from the environmental requirement for replacement of toxic layers, mainly chromates, from coating systems.
Is polyaniline toxic?
Moreover, PANI alone, being insoluble in aqueous media, can hardly be cytotoxic, but the possible impurities after polimeratization like low-molecular-weight reaction by-products may cause toxicity issues. Polyaniline is only soluble in few solvents (N-methylpyrrolidone, sulfuric or formic acid).
Why is polyaniline green?
The colour of PANI is pH dependent, as its protonated and non-protonated forms of the have different spectral characteristics. For doped polyaniline, or as you said in acidic condition, polyaniline exists in emerladine salt form, which is green in color.
Is polyaniline soluble in water?
Pure polyaniline (PAni) is insoluble in water. Water-soluble complexes of PAni with different of cellulose derivatives were successfully synthesized by using chemical oxidation polymerization of aniline in aqueous solution of cellulose derivatives.
What color is polyaniline?
green
For doped polyaniline, or as you said in acidic condition, polyaniline exists in emerladine salt form, which is green in color.
Which is the oxidation state of polyaniline polymer?
In principle, the polymer is synthesized on the EB (theoretically 1 − y = 0.5), but it can be obtained in a oxidation state between 0.4 (when synthesized on inert ambient, without air oxygen) and 0.6 (when synthesized on ambient atmosphere) [2], [4]. The three PANI forms: LB, EB, and PB, may be converted one to the other by the redox process [8]:
What makes polyaniline different from other conductive polymers?
Polyaniline is a conductive polymer which differs from the common conjugated polymers since its doping is accompanied by a chain protonation mechanism.
How are the oxidized and reduced states of Pani represented?
The oxidized and reduced states of PANI, and its derivatives, are represented by the index of y, reduced unity and 1 − y, oxidized unity as indicated in the chemical structure: where x is the polymerization degree. When R H, the structural formula represents the PANI, otherwise, a derivative of it when R is a substituted group.