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Role of hierarchical morphology of helical carbon nanotube bundles on thermal expansion of polymer nanocomposites

Published online by Cambridge University Press:  19 June 2017

Oleksandr G. Kravchenko Open the ORCID record for Oleksandr G. Kravchenko [Opens in a new window] ,
Xin Qian ,
Sergii G. Kravchenko ,
Rocio Misiego ,
R. Byron Pipes  and
Ica Manas-Zloczower
Oleksandr G. Kravchenko*
Affiliation:
Department of Macromolecular Science and Engineering, Case School of Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, USA
Xin Qian
Affiliation:
Department of Macromolecular Science and Engineering, Case School of Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, USA
Sergii G. Kravchenko
Affiliation:
School of Aeronautics and Astronautics, Purdue University, Indiana Manufacturing Institute, West Lafayette, Indiana 47906-1168, USA
Rocio Misiego
Affiliation:
SABIC, Murcia 30390, Spain
R. Byron Pipes
Affiliation:
School of Aeronautics and Astronautics, Materials Engineering and Chemical Engineering, Purdue University, Indiana Manufacturing Institute, West Lafayette, Indiana 47906-1168, USA
Ica Manas-Zloczower
Affiliation:
Department of Macromolecular Science and Engineering, Case School of Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, USA
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The thermal expansion behavior of polymer carbon nanotube (CNT) nanocomposites was investigated, and a micromechanical model was proposed to explain the highly nonlinear dependence of the coefficient of thermal expansion of the nanocomposite with CNT content for the CNT/polyimide nanocomposite. The microscopic analysis of CNT/polyimide matrix showed homogeneous dispersion of bundles composed of CNTs. Therefore, the proposed model to predict the thermal expansion behavior of the nanocomposite considered a random, homogeneous distribution of CNT bundles with a hierarchical arrangement of helical CNTs within the polymeric matrix. The CNT bundle morphology influenced the thermal expansion response of the nanocomposite through (i) bundle volume fraction and (ii) degree of helicity, affecting thermo-mechanical properties of the bundle. The effective, homogenized, properties of CNT bundles were determined by the elasticity based solution of the layered cylinder model. Bundle effective properties were used in the micromechanical model implementing the homogenized strain rule of the mixture expression to predict the thermal expansion behavior of nanocomposite in a wide range of CNT volume contents. The proposed micromechanical analytical model was found to correlate closely with the experimental results for polyimide/CNT nanocomposite films as measured using a digital image correlation method.

Keywords

polymercompositemicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 14 , 28 July 2017 , pp. 2738 - 2746
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Linda S. Schadler

References

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