Tensile properties and deformation mechanisms of PU/MWCNTs nanocomposites

Tensile properties and deformation mechanisms of PU/MWCNTs nanocomposites The aim of this study was to investigate the mechanical properties and deformation mechanisms of thermoset polyurethane reinforced with different contents of multi-walled carbon nanotubes, i.e. 0.05–5 wt%, fabricated through a solution casting method. Tensile test was done at constant strain rate and different temperatures and Halpin–Tsai equation was used to compare the experimental results with theoretical predictions. Results showed that modulus, strength and toughness of polyurethane depended strongly on the amount of CNTs loading. Tensile strength of PU was enhanced approximately 122% by the contribution of 1 wt% CNTs at room temperature. Predictions of tensile strength by modified Halpin–Tsai equation were in good agreement with the experimental data. Microscopic observations showed that MWCNTs dispersed homogeneously throughout the PU matrix up to 1 wt% CNTs; but evidences of agglomeration were found at higher contents. Finally, dominant toughening mechanisms of PU/CNTs nanocomposites were considered. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Polymer Bulletin Springer Journals

Tensile properties and deformation mechanisms of PU/MWCNTs nanocomposites

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Springer-Verlag Berlin Heidelberg
Subject
Chemistry; Polymer Sciences; Soft and Granular Matter, Complex Fluids and Microfluidics; Characterization and Evaluation of Materials; Physical Chemistry; Organic Chemistry
ISSN
0170-0839
eISSN
1436-2449
D.O.I.
10.1007/s00289-017-1955-9
Publisher site
See Article on Publisher Site

Abstract

The aim of this study was to investigate the mechanical properties and deformation mechanisms of thermoset polyurethane reinforced with different contents of multi-walled carbon nanotubes, i.e. 0.05–5 wt%, fabricated through a solution casting method. Tensile test was done at constant strain rate and different temperatures and Halpin–Tsai equation was used to compare the experimental results with theoretical predictions. Results showed that modulus, strength and toughness of polyurethane depended strongly on the amount of CNTs loading. Tensile strength of PU was enhanced approximately 122% by the contribution of 1 wt% CNTs at room temperature. Predictions of tensile strength by modified Halpin–Tsai equation were in good agreement with the experimental data. Microscopic observations showed that MWCNTs dispersed homogeneously throughout the PU matrix up to 1 wt% CNTs; but evidences of agglomeration were found at higher contents. Finally, dominant toughening mechanisms of PU/CNTs nanocomposites were considered.

Journal

Polymer BulletinSpringer Journals

Published: Feb 25, 2017

References

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