Monomer and Polymer Grafting on Nylon Film Using Cobalt-60 Radiation

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Abstract
Rates of γ-ray-induced grafting on nylon 6 film were compared for pentafluorostyrene (PFS) and trifluoroethyl-methacrylate (TFEM). The logarithm of the measured rate of PFS grafting on nylon 5, plotted against reciprocal temperature, gave a straight-line Arrhenius plot between 23 and 80°C, the slope indicating an activation energy of 6.5 kcal mole. The addition of methanol accelerated the room temperature grafting of both PFS and TFEM on nylon 6, the rate passing through a maximum at 40 and 30 vol% methanol, respectively. The grafting of PFS on nylon 6 takes place most probably by a free radical mechanism. as indicated by the value of the energy of activation and by the fact that the reaction is not inhibited by water. Some work was done co extend the quantitative aspects of the theory of cocross-linking, and certain analogies with the theory of copoiymerization were demonstrated. Radiation-induced cocross-linking between a 5% solution of polyvinyl alcohol and a nylon film surface was shown, the initial rate of nylon weight gain due to grafted PVA being 0.14%, hr.