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Reorientation of carbon nanotubes in polymer matrix composites using compressive loading

Published online by Cambridge University Press:  01 April 2005

Michael J. Lance ,
Chun-Hway Hsueh ,
Ilia N. Ivanov  and
David B. Geohegan
Michael J. Lance*
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Chun-Hway Hsueh
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Ilia N. Ivanov
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
David B. Geohegan
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
*
a) Address all correspondence to this author. e-mail: lancem@ornl.gov
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Abstract

Purified single-walled nanotubes (SWNTs) were dispersed in an epoxy polymer and subjected to uniaxial compressive loading. The orientation and stress in the nanotubes were monitored in situ using polarized Raman microscopy. At strains less than 2%, the nanotubes reorient normal to the direction of compression, thereby minimizing the local strain energy. Above 2% strain, the Raman peak shift reaches a plateau. A new analytical model, which approximates the SWNT reorientation by varying the aspect ratio of a representative spheroid, predicted the rotation behavior of nanotubes under load. The results of this model suggest that the observed plateau of the Raman peak shift is caused by both polymer yielding and interfacial debonding at the ends of nanotubes.

Keywords

Elastic propertiesNanoparticleRaman spectroscopy
Type
Research Article
Information
Journal of Materials Research , Volume 20 , Issue 4 , April 2005 , pp. 1026 - 1032
Copyright
Copyright © Materials Research Society 2005

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