Pristine polypyrrole

Because of the extreme oxidative instability of polypyrrole, few structural studies of the pristine polymer have been carried out, and work on oligomers is equally hindered. 

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Figure 1.29. Model arrangement of the chains in a layer of pristine polypyrrole. The (a, h) plane of the monoclinic unit cell is indicated.

J. Lei and C. R. Martin, Infrared investigations of pristine polypyrrole—is the polymer called polypyrrole really poly(pyrrole-cf>-hydroxypyrrole) Synth. Met. 48 331 (1992). 

In much more recent work by Corish et al. [261], lattices for both pristine and doped (Bp4 , C104 ) polypyrrole and polythiophene have been generated by means of atomistic simulations. The geometric distor-... 

Ahlgren and Krische [92] reported the stability of electrochemically deposited polypyrrole on pristine polyacetylene (A-type) or predoped (B-type) with... 

FIGURE 5.18. Unit cell of pristine polythiophene (also assumed for polypyrrole). (Adapted from Ref. 125 by permission of the publishers.)... 

FIGURE 8.40 UV-Vis-NIR spectra of (a) a pristine PPy-DBSA film and of the same film after heat treatment at 200°C for (b) 2, (c) 10, (d) 20, (e) 30, and (f) 60 min under an inert atmosphere. (From Song, K.T., Synthesis of electrically conducting soluble polypyrrole and its characterization. Ph.D. thesis, 2000. With permission.)... 

The specific capacity of 163F/g has been obtained for multi-walled carbon nanotubes/polypyrrole composites prepared by coating the polypyrrole on carbon nanotubes through electrochemical polymerization, whereas it is only 50 F/g for the pristine nanotube [44]. 

As reported by Krische and Ahlgren [213], the electrochemical polymerization of pyrrole on a polyacetylene anode produces a composite of polyacetylene and polypyrrole. Polypyrrole appears to form on the outer surface of polyacetylene at 1.0 V (versus SCE) when an electrode with neutral polyacetylene grown on it is immersed in an electrolyte of 0.1 M tetrabutylammonium tetrafluoroborate and 0.1 M pyrrole dissolved in acetonitrile. When doped polyacetylene was used, the pyrrole seemed to form on the polyacetylene fibrils, leaving a porous material similar to the original polyacetylene. In either case, the copolymers have conductivities approaching 40 S cm" and demonstrate increased stability in the presence of air and moisture compared to pristine poly acetylene. 

Fig. 5 Infrared Spectrum of polypyrrole a) pristine and b) doped (from ref. 100)...

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