Mechanical and relaxation properties of γ-irradiated PVA doped with ferrous sulphate

摘要

Films of pure poly(vinyl alcohol) (PVA) and samples doped with different concentrations of heptahydrated ferrous sulphate were prepared using a casting method. Mechanical and relaxation properties were measured before and after irradiation. The modulus of elasticity, yield strength, tensile strength ductility and relaxation time were produced from true stress-true strain and stress relaxa- tion measurements. The measured parameters were found to be dependent on both FeSO_4 concentration and on γ-doses. A cyclic effect occurs.