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Article
Investigation of MWCNT Reinforcement on the Strain Hardening Behavior of Ultrahigh Molecular Weight Polyethylene
Journal of Nanotechnology (2011)
  • Hassan Mahfuz, Florida Atlantic University
  • Mujibur R. Khan, The University of Texas at El Paso
  • Theodora Leventouri, Florida Atlantic University
  • Efthymios Liarokapis, National Technical University of Athens
Abstract
We have investigated strain hardening behavior of ultrahigh molecular weight polyethylene (UHMWPE) reinforced with 2.0 wt% loading of multiwalled carbon nanotubes (MWCNTs). A solution spinning process was used to produce neat and MWCNT-reinforced filaments of UHMWPE. Tensile tests of filaments showed 62% and 114% improvement in strength and modulus, respectively. Strain hardening tests on filaments revealed spectacular contribution by MWCNTs in enhancing strength and modulus by more than one order of magnitude. SEM micrographs showed sufficient coating of nanotube surface with the polymer that promoted interface adhesion. This intimate interfacial interaction enforced alignment of nanotubes during repeated loading-unloading sequences and allowed effective load transfer to nanotubes. Close interaction between UHMWPE and nanotubes was further evidenced by Raman spectral distribution as a positive shift in the D-band suggesting compressive stress on nanotubes by lateral compression of polymer. Nanotubes thus deformed induced the desired strain hardening ability in the UHMWPE filament. Differential scanning calorimetry (DSC) tests indicated around 15% increase in crystallinity after strain hardening—which together with nanotube alignment resulted in such dramatic improvement in properties.
Keywords
  • MWCNT,
  • Multiwalled carbon nanotubes,
  • Ultrahigh molecular weight polyethylene,
  • UHMWPE,
  • Strain hardening behavior,
  • Strain hardening
Publication Date
February 20, 2011
DOI
10.1155/2011/637395
Publisher Statement
Copyright © 2011 Hassan Mahfuz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Article obtained from the Journal of Nanotechnology
Citation Information
Hassan Mahfuz, Mujibur R. Khan, Theodora Leventouri and Efthymios Liarokapis. "Investigation of MWCNT Reinforcement on the Strain Hardening Behavior of Ultrahigh Molecular Weight Polyethylene" Journal of Nanotechnology (2011)
doi:10.1155/2011/637395
Available at: http://works.bepress.com/mujibur-khan/5/