Reorientation of carbon nanotubes in polymer matrix composites using compressive loading

Michael J. Lance; Chun Hway Hsueh; Ilia N. Ivanov; David B. Geohegan

doi:10.1557/JMR.2005.0139

Reorientation of carbon nanotubes in polymer matrix composites using compressive loading

Michael J. Lance, Chun Hway Hsueh, Ilia N. Ivanov, David B. Geohegan

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7 Scopus citations

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.

Original language	English
Pages (from-to)	1026-1032
Number of pages	7
Journal	Journal of Materials Research
Volume	20
Issue number	4
DOIs	https://doi.org/10.1557/JMR.2005.0139
State	Published - Apr 2005

Funding

The authors thank H.T. Lin and A.A. Wereszczak for reviewing the manuscript. This research was jointly sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory and the United States Department of Energy, Division of Materials Sciences and Engineering, Office of Basic Energy under Contract No. DE-AC05-00OR22725 with UT-Battelle, Oak Ridge, TN.

Funders	Funder number
Laboratory Directed Research
Office of Basic Energy	DE-AC05-00OR22725
U.S. Department of Energy
Oak Ridge National Laboratory
Division of Materials Sciences and Engineering

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title = "Reorientation of carbon nanotubes in polymer matrix composites using compressive loading",

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.",

author = "Lance, {Michael J.} and Hsueh, {Chun Hway} and Ivanov, {Ilia N.} and Geohegan, {David B.}",

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AU - Lance, Michael J.

AU - Hsueh, Chun Hway

AU - Ivanov, Ilia N.

AU - Geohegan, David B.

PY - 2005/4

Y1 - 2005/4

N2 - 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.

AB - 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.

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Reorientation of carbon nanotubes in polymer matrix composites using compressive loading

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