A comparative study of the action of low-frequency glow-discharge plas
ma on the properties and structure of PM, Upilex S, and Upilex R polyi
mide films was carried out. The most profound changes in contact angle
, surface potential, and water adsorption by a film were observed for
Upilex S. By multiple internal reflection IR spectroscopy, it was foun
d that the process of plasma-chemical modification of any of these pol
yimide films opens the imide unit and forms polar NH and OH (in unboun
d carboxyls) groups.