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Depth-Dependent Hardness Improvements in Ion Irradiated Polystyrene

  • Gopal R. Rao (a1), Laura Riester (a1) and Eal H. Lee (a1)

Abstract

Polystyrene (PS) was irradiated with 2 MeV He+ ions to a fluence of 3.3×1019 ions/m2. A cross-section of the irradiated layer was subjected to hardness measurements across the section using a nanoindentation technique. Results showed that hardness increased as a function of irradiation depth and showed a maximum value of 12 GPa at a depth of approximately 6.5 μπι, for a total ion penetration range of 9 μιη, as compared to a hardness of 0.45 GPa for unirradiated PS. The hardness variation with depth followed the trend for Linear Energy Transfer (LET) for ionization from the energetic ions to substrate atoms. This investigation showed for the first time how hardness varies as a function of depth for ion-irradiated polymers; this variation approximately follows the ionization LET profile, suggesting that cross-linking in the polymers could be proportional to ionization.

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1 Venkatesan, T., Calcagno, L., Ellman, B. S. and Foti, G., Ion beam effects in organic molecular solids and polymers, Ion Beam Modification of Insulators, ed. Mazzoldi, P. and Arnold, G. W. (Elsevier, 1987) pp.301379.
2 Lee, E. H., Lewis, M. B., Blau, P. J., and Mansur, L. K.,. Mater. Res., 6, 610 (1991).
3 Rao, G. R., Lee, E. H. and Mansur, L. K., Wear, 162–164, 739747 (1993).
4 Rao, G. R., Lee, E. H. and Mansur, L. K.,. Mater. Res., 10, (1995) (in press).
5 Lee, E. H., Lee, Y., Oliver, W. C., and Mansur, L. K.,. Mater. Res., 8, 377 (1983).
6 Lewis, M. B., Allen, W. R., Buhl, R. A., Packan, N. H., Cook, S. W. and Mansur, L. K., Triple ion beam irradiation facility, Nucl. Instrum. Meth., B43, 243 (1989).
7 Lee, E. H., Rao, G. R., Lewis, M. B. and Mansur, L. K., Effects of Electronic and Nuclear Processes in Polymers during Ion Implantation, Journal of Materials Research, 9, 1043 (1994).
8 Lee, E. H., Rao, G. R., Lewis, M. B. and Mansur, L. K., Ion beam application for improved polymer properties, Nucl. Instrum. Meth., B74, 3326 (1993).

Depth-Dependent Hardness Improvements in Ion Irradiated Polystyrene

  • Gopal R. Rao (a1), Laura Riester (a1) and Eal H. Lee (a1)

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