Abstract
Styrene (St) and acrylic acid (AA) were grafted onto 0 · 1 mm thick PTFE films pre-irradiated in air. The kinetics were investigated at different temperatures and radiation doses. The results show that the grafting process exhibits a strong auto-catalytic character due to the progressive diffusion of the monomer and to the “gel effect”. The active centres which initiate grafting appear to be asymmetric diperoxides containing a perfluorinated polymeric chain and a small fluorinated fragment. The swelling of the films grafted with AA was investigated in water, KOH and HCl. It was found that the films grafted by the pre-irradiation method have a better stability than those prepared by the direct radiation method.
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