Modification of polymeric surfaces with xenon difluoride has been inve
stigated using polyvinyltrimethylsilane as an example. From the data o
f elemental analysis and IR and NMR spectroscopy it has been concluded
that the fluorination is of superficial character. A possibility has
been demonstrated oi improving the gas separating properties of polyme
ric organosilicon membranes by fluorination with xenon difluoride.