What is doped polyacetylene?

These highly conductive forms of polyacetylene were achieved via oxidation or reduction of the neutral polymer and such redox modified conjugated polymers are often referred to as doped materials in analogy to the doping of inorganic semiconductors such as silicon.

What is the structure of polyacetylene?

Polyacetylene consists of a long chain of carbon atoms with alternating single and double bonds between them, each with one hydrogen atom. The double bonds can have either cis or trans geometry.

What is a doped polymer?

Doping is the process by which conductivity of the polymers may be increased by creating negative or positive charge on the polymer backbone by oxidation or reduction. Doping may be of two types: (A) p-Doping : It is done by oxidation process. In this process, the conducting polymer is treated with a Lewis acid.

What are the isomers of polyacetylene?

PA exists in two isomeric forms: trans and cis, see Fig. 13.3. The trans form is the thermodynamically stable form at room temperature.

Which is a unique property of polyacetylene?

Polyacetylene is an archetypal conjugated polymer and consists of a long chain of carbon atoms with alternating single and double bonds. The disubstituted polyacetylene has a strong thermal decomposition resistance and an efficient emission of blue light, making it a good candidate for a polymeric chemosensor.

How is polyacetylene prepared?

Polyacetylene I1 was prepared by using the cobalt nitrate-sodium borohydride+thanol catalyst system of L~ttinger. ~ The solid product was filtered off, washed with ethanol, concentrated hydrochloric acid, water until neutral, and again with ethanol. The poly- mer was dried at 25OC under vacuum for 18 hr.

Is polyacetylene a conducting polymer?

1 Highly conductive materials. Polyacetylene (PA) was the first polymer exhibiting high conductivity comparable with metals if exposed to oxidising agents like iodine vapour. Oxidation forms charge carriers on the conjugated polyene structure, especially of p-type conductivity.

Is polyacetylene a semiconductor?

4.1 Polyacetylene Polyacetylene is often taken as a prototype for the class of conjugated organic polymers. [199, 200], with polyacetylene as the active semiconductor compound. In that case the polymer was formed from a solution-processible precursor polymer.

What type of polymer is polyacetylene?

Polyacetylene is an archetypal conjugated polymer and consists of a long chain of carbon atoms with alternating single and double bonds.

What is polymer structure?

A polymer is composed of many simple molecules that are repeating structural units called monomers. A single polymer molecule may consist of hundreds to a million monomers and may have a linear, branched, or network structure. Copolymers are polymers composed of two or more different types of monomers.

What are the 3 main types of polymer?

There are 3 principal classes of polymers – thermoplastics, thermosets, and elastomers. Differentiation between these classes is best defined by their behaviour under applied heat. Thermoplastic polymers can be either amorphous or crystalline. They behave in a relatively ductile manner but often have low strength.