Mechanical and structural modification of CR-39 polymer surface by 50-keV hydrogen and argon ion implantation
In this study we report hardness changes and structural effects in the polymer Cr-39 following implantation with 50-keV hydrogen and argon ions to doses between 1 × 10 15 and 2.8 × 10 17 ions/cm 2. An increase in hardness (maximum contact pressure) was observed following both H and Ar implantation, with increases by factors of 6.5 and 1.5, respectively. Significant compaction of the ion beam modified layer was also observed for both ion species. These results suggest that the bonding changes induced by H implantation, which is dominated by electronic stopping processes, are more effective at enhancing the hardness of CR-39 than Ar implantation, which has considerable nuclear as well as electronic stopping.