Abstract
Teflon-FEP films exposed in air to gamma-rays were contacted under vacuum with vinylimidazole (VI) both in bulk and in aqueous solution. It was found that the limiting extent of grafting only moderately increases with monomer concentration in water, but that in pure VI a much faster reaction takes place and much higher limiting grafting yields are observed. The reaction was studied at temperatures ranging from 60 to 90°. Over all activation energies were 72 kJ/mol in 50% aqueous solutions but 124 kJ/mol in bulk. The limiting grafting yields increase with dose of irradiation up to 50–70 kGy and remain almost constant for higher doses. The results are discussed and compared with other data obtained in similar systems.
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