Effect of dopant counter-anion on tribological properties of polypyrrole

✍ Scribed by A. T. Chyla; S. Ryley; D. J. Walton; X. Liu; D. G. Chetwynd

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 125 KB
• Volume: 8
• Category: Article
• ISSN: 1616-301X
• DOI: 10.1002/(sici)1099-0712(199803/04)8:2<87::aid-amo334>3.0.co;2-3

✦ Synopsis

It is known that, with careful control of conditions, polypyrrole films with counter-ions of toluene sulphonic acid sodium salt and methane phosphonic acid sodium salt can be produced with friction coefficients comparable with or even better than PTFE. Here we now report a systematic study of polypyrrole with various planar anions for tribological bearing applications. Thus naphthalene disulphonate-doped polypyrrole has a kind of laminar structure with very good adhesion to the surface. Polymer films were electrodeposited on glass lenses and tested in a friction apparatus for friction and wear measurements. The film orientation was measured by low-angle X-ray diffraction and the surface structure was evaluated by both AFM and SEM for different film thicknesses. The friction coefficient and wear rate of such bearings were measured under loads up to 5 N and at speeds up to 30 mm s 71 and were found to be 0.06 and 0.04 nm mm 71 respectively. *