How do you make polyacetylene?
Polyacetylene can be synthesized by ring-opening metathesis polymerization (ROMP) from cyclooctatetraene, a material easier to handle than the acetylene monomer. This synthetic route also provides a facile method for adding solubilizing groups to the polymer while maintaining the conjugation.
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.
What is polyacetylene used for?
4.4 Conducting Polymers. Polyacetylene is the simplest conjugated organic polymer and hence is used extensively to model mechanisms of electrical conduction for such systems (59).
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.
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?
11.7. Polyacetylene (PA) is an organic polymer discovered by Hideki Shirakawa, Alan Heeger, and Alan MacDiarmid with the chemical formula of (C2H2)n. It forms by the oxidative polymerization of acetylene monomer to form a continuous linear chain of olefin groups.
Why is polyacetylene a semiconductor?
Thus, polyacetylene would be a one-dimensional metal. However, in 1955, Peierls showed that 1D metals are unstable with respect to a structural distortion that opens up an energy gap at the Fermi level; thereby, 1D metals end up as semiconductors.
What are conducting polymers explain polyacetylene in detail?
Although the pi-electrons in polyacetylene are delocalized along the chain, pristine polyacetylene is not a metal. Polyacetylene has alternating single and double bonds which have lengths of 1.44 and 1.36 Å, respectively. Upon doping, the bond alteration is diminished in conductivity increases.