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Nanoscale Mechanical Properties of Polymer Composites: Changes in Elastic Modulus and Measurement of Ion Penetration Depth Due to α-radiation

Published online by Cambridge University Press:  31 January 2011

Allen T. Chien ,
Tom Felter ,
James D. LeMay  and
Mehdi Balooch
Allen T. Chien
Affiliation:
Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, California 94551
Tom Felter
Affiliation:
Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, California 94551
James D. LeMay
Affiliation:
Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, California 94551
Mehdi Balooch
Affiliation:
Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, California 94551
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Abstract

The local mechanical properties of silica-reinforced silicone composites were investigated using a modified atomic force microscopy technique. Elastic modulus measurements (1.5 ± 0.1 MPa) are consistent with bulk measurements (1.9 MPa), and changes in the modulus at the surface of the composite samples (E = 1.5 to 3.5 MPa) were observed as a result of α-irradiation (dose = 1.7 × 1010 to 2.0 × 1012 α/cm2). The sensitivity of the technique was demonstrated by a detectable change in modulus at even the small dose of 1.7 × 1010 α/cm2. The penetration depth of the α-particles into the material, estimated to be 22 ± 2 μm from the sample edge, was determined by cross-section depth profiling; and modeling of the ion penetration depth using transport of ions in matter codes (24.4 ± 0.4 μm) closely matched experimental observations.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 15 , Issue 4 , April 2000 , pp. 838 - 841
Copyright
Copyright © Materials Research Society 2000

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