Abstract
Interest in polymeric materials with dispersed nanotubes has increased in recent years. There are several methods to characterize this kind of dispersions that may be based on evaluating the percolation concentration, the “goodness” of the dispersion, or the matrix-nanotube interphase. Among other techniques, rheology and conductivity are used to this aim. Commonly, the oscillatory rheology measurements are performed within the linear viscoelastic range, which is achieved by operating at small amplitude oscillation shear. Nevertheless, these measurements do not fully describe the behavior of the dispersion structure. In this work, we propose the use of medium amplitude oscillation shear and large amplitude oscillation shear to characterize the dispersion/structure of a thermoplastic polyurethane matrix filled with multiwalled carbon nanotubes. The Ewoldt framework mathematical approach is used to analyze the non-linear stress response. That approach allows obtaining physically grounded magnitudes from the experimental data. These magnitudes allow for a better understanding of the effects of the filler content.
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References
Wetzel B, Haupert F, Zhang MQ. Epoxy nanocomposites with high mechanical and tribological performance. Compos Sci Technol. 2003;63:2055–206.
Park JH, Jana SC. The relationship between nano-and micro-structures and mechanical properties in PMMA-epoxy-nanoclay composites. Polymer. 2003;44:2091–100.
Han J, Cho K. Nanoparticle-induced enhancement in fracture toughness of highly loaded epoxy composites over a wide temperature range. J Mater Sci. 2006;41:4239–45.
Drzal LT, Rich MJ, Koenig MF, Lloyd PF. Adhesion of graphite fibers to epoxy matrices: II. The effect of fiber finish. J Adhes. 1983;16:133–52.
Schadler LS. Polymer-based and polymer-filled nanocomposites. In: Ajayan PM, Schadler LS, Braun PV, editors. Nanocomposite science and technology. Weinheim: Wiley; 2003. p. 77–135.
Xia H, Song M. Preparation and characterization of polyurethane–carbon nanotube composites. Soft Matter. 2005;1:386–94.
Xia H, Song M. Preparation and characterisation of polyurethane grafted single-walled carbon nanotubes and derived polyurethane nanocomposites. J Mater Chem. 2006;16:1843–51.
Koerner H, Price G, Pearce NA, Alexander M, Vaia RA. Remotely actuated polymer nanocomposites-stress-recovery of carbon-nanotube-filled thermoplastic elastomers. Nat Mater. 2004;3:115–20.
Cho JW, Kim JW, Jung YC, Goo NS. Electroactive shape-memory polyurethane composites incorporating carbon nanotubes. Macromol Rapid Commun. 2005;26:412–6.
Fernandez I, Santamaría A, Muñoz ME, Castell P. A rheological analysis of interactions in phenoxy/organoclay nanocomposites. Eur Polym J. 2007;43(8):3171–6.
Hyun K, Kim SH, Ahn KH, Lee SJ. Large amplitude oscillatory shear as a way to classify the complex fluids. J Non-Newton Fluid Mech. 2002;107(1–3):51–65.
Wilhelm M, Maring D, Spiess H-W. Fourier-transform rheology. Rheol Acta. 1998;37(4):399–405.
Wilhelm M, Reinheimer P, Ortseifer M. High sensitivity Fourier-transform rheology. Rheol Acta. 1999;38(4):349–56.
Ewoldt RH, Winter P, Maxey J, McKinley GH. Large amplitude oscillatory shear of pseudoplastic and elastoviscoplastic materials. Rheol Acta. 2010;49(2):191–212.
Ewoldt RH, Hosoi AE, McKinley GH. New measures for characterizing nonlinear viscoelasticity in large amplitude oscillatory shear. J Rheol. 2008;52(6):1427.
Tarrío-Saavedra J, Gracia-Fernández C, López-Beceiro J, Naya S, Artiaga R. TMDSC phase angle for a better nanocomposite interphase identification. J Therm Anal Calorim. 2012;109:1277–84.
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This work was partially funded by the Spanish Ministerio de Educacion y Ciencia MTM2011-22393.
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Gracia-Fernandez, C., Gómez-Barreiro, S., López-Beceiro, J. et al. Characterization of MWCNT/TPU systems by large amplitude oscillation shear. J Therm Anal Calorim 115, 1727–1731 (2014). https://doi.org/10.1007/s10973-013-3402-y
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DOI: https://doi.org/10.1007/s10973-013-3402-y