Effects of reorientation of graphene platelets (GPLs) on Young's modulus of polymer composites under bi-axial stretching

Feng, C, Wang, Y and Yang, J 2018, 'Effects of reorientation of graphene platelets (GPLs) on Young's modulus of polymer composites under bi-axial stretching', Nanomaterials, vol. 8, no. 27, pp. 1-20.


Document type: Journal Article
Collection: Journal Articles

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Title Effects of reorientation of graphene platelets (GPLs) on Young's modulus of polymer composites under bi-axial stretching
Author(s) Feng, C
Wang, Y
Yang, J
Year 2018
Journal name Nanomaterials
Volume number 8
Issue number 27
Start page 1
End page 20
Total pages 20
Publisher MDPI AG
Abstract Effects of bi-axial stretching induced reorientation of graphene platelets (GPLs) on the Young's modulus of GPL/polymer composites is studied by Mori-Tanaka micromechanics model. The dispersion state of the GPLs in polymer matrix is captured by an orientation distribution function (ODF), in which two Euler angles are used to identify the orientation of the GPLs. Compared to uni-axial stretching, the increase of the stretching strain in the second direction enhances the re-alignment of GPL fillers in this direction while it deteriorates the re-alignment of the fillers in the other two directions. Comprehensive parametric study on the effects of the out-of-plane Young's modulus, stretching strain, strain ratio, Poisson's ratio and weight fraction and GPL dimension on the effective Young's moduli of the composites in the three directions are conducted. It is found that the out-of-plane Young's modulus has limited effects on the overall Young's modulus of the composites. The second stretching enhances the Young's modulus in this direction while it decreases the Young's modulus in the other two directions. The results demonstrate the increase of Poisson's ratio is favorable in increasing the Young's modulus of the composites. GPLs with larger diameter-to-thickness ratio have better reinforcing effect on the Young's modulus of GPL/polymer nanocomposites.
Subject Mechanical Engineering not elsewhere classified
Solid Mechanics
Civil Engineering not elsewhere classified
Keyword(s) micromechanics
graphene platelets
nanocomposites
bi-axial stretching
orientation distribution
DOI - identifier 10.3390/nano8010027
Copyright notice © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
ISSN 2079-4991
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