Ion-irradiation induced hydrogen loss from polyethylene film

摘要

Degradation of a polymer under ion irradiation is investigated quantitatively. The loss of hydrogen atoms in polyethylene films under bombardment of various kinds of ions has been measured by directly monitoring recoil hydrogen atoms. Fluence dependence of the decrease in the hydrogen density is analyzed using a modified model based on that of M. P. de Jong, A. J. H. Maas, L. J. van Ijzendoorn, S. S. Klein, and M. J. A. de Voigt, J. Appl. Phys. 82, 1058 (1997). It is shown that the dependence is well explained by the present model with a hydrogen trapping reaction constant having hydrogen density dependence. It is found that the product of a bond cleavage probability squared and an ion track area is proportional to z(4)/E-3, where z and E are the atomic number and energy of the projectile, respectively. (C) 2002 American Institute of Physics. References: 7