Polypyrroles random copolymers

Figure 10.1 Atomic force microscopy (AFM) image of one 100-nm-wide polypyrrole wire that bridges the ends of two polypyrrole microelectrodes (size 9 pm x Wpm). (Reprinted with permission from Advanced Materials, Patterning of Conducting Polymers Based on a Random Copolymer Strategy Toward the Facile Fabrication of Nanosensors Exclusively Based on Polymers by B. Dong, D. Y. Zhong, L. F. Chi and FI. Fuchs, 17, 22, 2736-2741. Copyright (2005) Wiley-VCH)...

Morales, J., M.G. Olayo, and G.J. Cruz. 2002. Plasma polymerization of random polyaniline-polypyrrole-iodine copolymers. J Appl Polym Sci 85 52. 

Start and Mauritz [396] used environmental SEM-EDAX, and also AFM and transmission electron microscopy, to study the formation of organic-inorganic nanocomposites within surlyn(PE-co-methacrylate-cation forms) random copolymers. SEM-EDAX has also been used to study of thin films of Prussian blue and N-substituted polypyrroles [397], epoxy resins [399], and the cause of failure in acetal plumbing fittings caused by exposure to chlorine [400]. 

Random copolymers have been prepared by electropolymerization of a mixture of terthienyl derivates and pyrrole [348]. Otherwise, a thiophene-pyrrole block copolymer showing electrical and electrochemical properties intermediate between those of polypyrrole... 

This chapter is divided into two main parts polythiophene copolymers and polypyrrole copolymers. Each part reviews the random copolymerization of the heterocyclic monomer and important derivatives, principally those with substituents at the 3-position of thiophene and at the 1- and 3-positions of pyrrole. Alternating, block and graft copolymers are covered in both segments. Because applications of conducting polymers are reviewed in Volume 4, only applications unique to specify copolymers are covered here. In addition, a few theoretical studies dealing with conducting copolymers are reviewed. 

Cyclic voltammetry of the copolymer shows three anodic peaks, two matching the oxidation potentials of the parent homopolymers and a third which is intermediate. Authors attributed the data to the formation of blocks of polypyrrole and polythiophene cormected by blocks of random alternating groups of pyrrole and bithiophene. Increasing the amount of bithiophene in the copolymer produced a strong drop in the final conductivity of the materials, from 17 S cm at 1 mol% to I S cm at 14 mol%. 

---