A polymer is a large molecule which is formed by repeated linkage of small molecule called monomers. Conducting polymer have been the subjects for many decades as possible synthetic metals. Many of these polymer, especially those with a conjugated pi-bond system ,often yield higher conductivity once having undergone the doping process. Polymers are typically insulators due to their very high resistivity .Insulators have tightly bound electrons so that nearly no electron flow occurs ,and they offer high resistance to charge flow. Conductance free electrons are needed. Conductivity in polymer can be induced by delocalizing their orbital with conjugated p-electron backbones. Discovered in the late seventies (1977) by Alan Heegar , Dr. Hideki
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The soliton is a charged or a neutral defect in the polyacetylene chain that propagates down the chain, thereby reducing the barrier for interconversion.
• The mechanism followed by polyacetylene for the transfer of charge from one chain to another is called intersoliton hopping.
• In n-type doping soliton is a resonance stabilized
Polyenyl anion of approximately 29 to 31 CH units in
Length, with highest amplitude at the centre of the defect.
The solitons (anions) transfer electrons to a neutral soliton
(Radical) in a neighboring chain through an is energetic process. • The charged solitons are responsible for making polyacetylene a conductor.
• In p-type doping, The dopant (Iodine) attracts an electron from the polyacetylene chain to form I-3 leaving a positive soliton (carbenium ion) in the polymer chain that
Can move along its length.
The lonely electron of the double bond can move easily.
As a consequence, the double bond successively moves along the molecule, and the
Polymer is stabilized by having the charge spread over the polymer chain.
2) Polypyrrole 3) Polyaniline
2 .DOPED CONDUCTING …show more content…
EXTRINSICALLY CONDUCTING POLYMER
In this type of polymer externally ingredient is added, therefor conductivity is due to the presence of externally added ingredient.
There are 2 types:
1) Conductive element filled polymer Conducting Elements like carbon black, metallic fibers, metal oxides, etc. are added in polymer. This polymer has very good conductivity. As the cost is low, they are light in weight, mechanically durable & strong
This polymer has ability of transforming into different forms, shapes & size
2) Blended conducting polymer
Polymer obtained by blending a conventional polymer with a conducting polymer by physical or chemical change.
4. COORDINATE CONDUCTING POLYMER
When a metal combines with a polydentate ligand then charge transfer complex containing polymer is obtained.
They exhibit corrosion characteristics, and are usually in doubtable in most solvents.
APPLICATION OF CONDUCTING POLYMER
1. As sensors into clothing.
2. Conducting polymer textiles as a camouflage for defense machinery. Since the
Textiles has no sharp edges they absorb more than 50% of the incident microwave
Radiation.
3. In controlled drug release applications,
The soliton is a charged or a neutral defect in the polyacetylene chain that propagates down the chain, thereby reducing the barrier for interconversion.
• The mechanism followed by polyacetylene for the transfer of charge from one chain to another is called intersoliton hopping.
• In n-type doping soliton is a resonance stabilized
Polyenyl anion of approximately 29 to 31 CH units in
Length, with highest amplitude at the centre of the defect.
The solitons (anions) transfer electrons to a neutral soliton
(Radical) in a neighboring chain through an is energetic process. • The charged solitons are responsible for making polyacetylene a conductor.
• In p-type doping, The dopant (Iodine) attracts an electron from the polyacetylene chain to form I-3 leaving a positive soliton (carbenium ion) in the polymer chain that
Can move along its length.
The lonely electron of the double bond can move easily.
As a consequence, the double bond successively moves along the molecule, and the
Polymer is stabilized by having the charge spread over the polymer chain.
2) Polypyrrole 3) Polyaniline
2 .DOPED CONDUCTING …show more content…
EXTRINSICALLY CONDUCTING POLYMER
In this type of polymer externally ingredient is added, therefor conductivity is due to the presence of externally added ingredient.
There are 2 types:
1) Conductive element filled polymer Conducting Elements like carbon black, metallic fibers, metal oxides, etc. are added in polymer. This polymer has very good conductivity. As the cost is low, they are light in weight, mechanically durable & strong
This polymer has ability of transforming into different forms, shapes & size
2) Blended conducting polymer
Polymer obtained by blending a conventional polymer with a conducting polymer by physical or chemical change.
4. COORDINATE CONDUCTING POLYMER
When a metal combines with a polydentate ligand then charge transfer complex containing polymer is obtained.
They exhibit corrosion characteristics, and are usually in doubtable in most solvents.
APPLICATION OF CONDUCTING POLYMER
1. As sensors into clothing.
2. Conducting polymer textiles as a camouflage for defense machinery. Since the
Textiles has no sharp edges they absorb more than 50% of the incident microwave
Radiation.
3. In controlled drug release applications,