The creep and stress and strain relaxation behaviours of two different types of polymer have been investigated; polyethylene in strip form and polystyrene in fibre form. All measurements have been carried out before and after exposure to an oxygen ion beam of current densities 100 and 200/~A cm -2 at an energy of 0.5 keV for 1.8 x 10 3 and 0.9 x l0 3 S, respectively. Young's modulus has been measured as a function of temperature. The activation energies have been calculated from stress and strain relaxation measurements. The results obtained made it possible to determine a complete set of mechanical parameters, e.g. relaxation time z, critical strength tr c and structural sensitive parameter y, for both before and after ion exposure. The mechanical properties of the polymers investigated were found to be improved after exposure to oxygen ions due to structural changes.
Посилання на статтю:
Influence of low energy oxygen ions on some mechanical properties of polyethylene and polystyrene / M. D. Migahed, A. H. Oraby, M. Hammam*, K. A. EI-Farahety and M. A. AbuI-Ez // Polymer. – 1992. – Vol 33. – P. 106-110.