Conducting polymers polyacetylene

The concept of electrochemical intercalation/insertion of guest ions into the host material is further used in connection with redox processes in electronically conductive polymers (polyacetylene, polypyrrole, etc., see below). The product of the electrochemical insertion reaction should also be an electrical conductor. The latter condition is sometimes by-passed, in systems where the non-conducting host material (e.g. fluorographite) is finely mixed with a conductive binder. All the mentioned host materials (graphite, oxides, sulphides, polymers, fluorographite) are studied as prospective cathodic materials for Li batteries. 

The relatively high electronic conductivity of conducting polymers is connected with the presence in polymers of internal system of poly-7t-conjugated bonds. This is easy to understand on the example of a simplest type of conducting polymer (polyacetylene) in the main and activated states (Figure 6). 

Like many other organic conducting polymers, polyacetylene is electrochemically active, attracting a great deal of interest both from the scientific and the applied point of view. In the year 2000 the chemistry Nobel Prize was granted to A. J. Heeger, H. Shirakawa, and A. G. MacDiarmid for their work on polyacetylene and the nature of conducting polymers. 

The first study of spin dynamics in a conducting polymer, polyacetylene doped with AsFb, was reported by Ncchtschein et al. in 1980, as shown in Figure 6.52 [143]. With (6.14) assuming cj>... 

Kaiser, A.B., S.A. Rogers, and Y.W. ParL 2004. Charge transport in conducting polymers Polyacetylene nanofibers. Mol Cryst Liq Ctyst 415 269. 

Krinichnyi, V. I., 1996. The nature and dynamics of non-linear excitations in conducting polymers. Polyacetylene, Uspechi chimo (Russ.), 65, 84-97 (1996). 

Baeriswyl, G. Harbeke, H. Kiess, and W. Meyer, Conducting polymers Polyacetylene, "Electronic Properties of Polymers," J. Mort and G. Pfister, eds., Wiley-Interscience, New York (1982). 

Conducting Polymer Polyacetylene (PAc), polyaniline(PAn), polypyrole(PPy) fiber. 10 -10 ... 

This chapter presents some examples of the application of the ab initio crystal-orbital method described in Chapter 1. Though these applications range from the field of plastics (polyethylene and its fluoro derivatives) through highly conducting polymers [polyacetylenes and polydiacetylenes, (SN) c, TCNQ and TTF stacks] to biopolymers (homopolynucleotides and homopolypeptides), they are only illustrative. No attempt has been made to review the numerous other applications performed by the Namur group and by other researchers, as this would increase unduly the size of this book. 

At the time of the first edition of this handbook, instability and poor processibility were the major obstacles to the commercialization of conducting polymers. Polyacetylene was the most widely studied polymer. Despite the fact that copper-like conductivity has been achieved... 

Baeriswyl D., Harbeke G., Kiess H., and Meyer W., "Conducting Polymers Polyacetylene" in "Electronic Properties of Polymers" Mort and Pfister, Eds., John Wiley, New York, in press... 

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