The influence of acrylonitrile during the grafting process of styrene onto
pre- irradiated films of poly(tetrafluoroethylene -co-hexafluoropropylene)
(FEP) and poly(tetrafluorothylene-alt-ethylene) (ETFE) was studied. The com
position of the graft polymers was analysed with elementary analyses. A cor
relation between the acrylonitrile content of the monomer solution and the
degree of grafting: was determined.