Abstract
Acrylic acid was grafted onto a 100-μm thick poly(tetrafluoroethylene) (PTFE) film by simultaneous irradiation method. The effect of the dose rate on the grafting and, the changes in the film thickness, water absorption, and electric resistance of the grafted film were investigated. The results suggested that the nongrafted layer remains in the middle part of the film at lower percent of grafting and then disappears as the grafting proceeds. Interference microscopy of the grafted film revealed that this grafting occurs by a gradual diffusion of the monomer through the successive grafted layers which swell in the reaction medium, i.e., the grafted front moves inward into film.
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