POLARIZED XANES STUDIES ON THE MECHANICAL RUBBING EFFECT OF POLY(TETRAFLUOROETHYLENE) AND ITS MODEL-COMPOUND

The structural change of the evaporated perfluorotetracosane (PFT) n-C F3(CF2)(22)CF3 and poly(tetrafluoroethylene) (PTFE) (CF2)(n) films by the mechanical rubbing process was examined with use of XANES spectros copy. In the PTFE film the chains were almost parallel to the surface and were uniaxially realigned along the rubbing direction, while in th e PFT film the chains after evaporation were oriented normal to the su rface, and this orientation was hardly affected by the rubbing process . The chains of the PFT evaporated on the rubbed PTFE film aligned alo ng the rubbing direction.