Effets des solvants sur le greffage radiochimique de la vinyl-4-pyridine dans des films de polytetrafluoroethylene

Grafting of 4-vinylpyridine into the depth of PTFE films was studied using the direct radiation chemical method and solutions of monomer in either methanol or pyridine. In methanol solutions, the grafting rate is maximum for monomer concentrations of 60–85 per cent. In pyridine solutions, the rate of grafting steadily increases with monomer content. The extent of swelling of the grafted films in water is greater the longer the grafted branches. These various results are discussed.