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Influence of implantation of heavy metallic ions on the mechanical properties of two polymers, polystyrene and polyethylene terephthalate

Published online by Cambridge University Press:  31 January 2011

Michael V. Swain ,
Anthony J. Perry ,
James R. Treglio ,
Alex Elkind  and
J. Derek Demaree
Michael V. Swain
Affiliation:
CSIRO Division of Applied Physics, Lindfield, New South Wales 2070, and Department of Mechanical and Mechatronic Engineering, University of Sydney, New South Wales 2006, Australia
Anthony J. Perry
Affiliation:
ISM Technologies Inc., 9965 Carroll Canyon Road, San Diego, California 92131
James R. Treglio
Affiliation:
ISM Technologies Inc., 9965 Carroll Canyon Road, San Diego, California 92131
Alex Elkind
Affiliation:
ISM Technologies Inc., 9965 Carroll Canyon Road, San Diego, California 92131
J. Derek Demaree
Affiliation:
U.S. Army Research Laboratory, Materials Directorate, Watertown, Massachusetts 02172–0001
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Abstract

Ion implantation of polyethylene terephthalate (PET) and polystyrene (PS) with various high energy metallic ions at 70 kV and a dose of 3 × 1016 ions/cm2 has been made. Measurements of the mechanical properties of the polymers before and after implantation have been made with an ultra microindentation system using both pointed and a small (2 μm) radius spherical-tipped indenter. The surface regions were also investigated by atomic force microscopy (AFM) and Rutherford backscattering (RBS). Significant differences have been observed between the Ti–B dual-implanted surfaces and those of the Au and W implanted surfaces. For both the PET and PS, the resistance to indenter penetration at very low loads was much greater for the Ti–B dual-implanted surfaces. The estimated maximum hardness and modulus of the implanted materials were 0.3 and 8 GPa for the PET material and 1.4 and 16 GPa for the PS material. The results obtained with the spherical indenter show a gradual decline in effective modulus of the surface with penetration depth, whereas the hardness or contact pressure goes through a maximum before declining asymptotically to the bulk values. The values of hardness estimated for the spherical-tipped indenter are somewhat more conservative than the optimistic estimates with the Berkovich indenter. The improved increase in hardness for the Ti–B dual-implanted PET material scales with the RBS measured increased depth of implantation.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 7 , July 1997 , pp. 1917 - 1926
Copyright
Copyright © Materials Research Society 1997

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