Authors: Suhr, J.; Joshi, A.; Schadler, L.; Kane, R.S.; Koratkar, N.A.

Source: Journal of Nanoscience and Nanotechnology, Volume 7, Numbers 4-5, April/May 2007 , pp. 1684-1687(4)

Publisher: American Scientific Publishers

Abstract:

Single-walled carbon nanotube polycarbonate and C₆₀ polycarbonate nanocomposites were fabricated using a solution mixing method. The composite loss modulus was characterized by application of dynamic (sinusoidal) load to the nanocomposite and the pure polymer samples. For a loading of 1 weight %, the single-walled nanotube fillers generated more than a 250% increase in loss modulus compared to the baseline (pure) polycarbonate. Even though the surface area to volume ratio and surface chemistry of C₆₀ is similar to that for nanotubes, we report no significant increase in the energy dissipation for the 1% weight C₆₀ nanoparticle composite compared to the pure polymer. We explain these observations by comparing qualitatively, the active sliding area (considering both normal and shear stresses) for a representative volume element of the nanotube and the nanoparticle composites. These results highlight the important role played by the filler geometry in controlling energy dissipation in nanocomposite materials.

Keywords: ENERGY DISSIPATION; DAMPING; NANOPARTICLES; FULLERENES; CARBON NANOTUBES; NANO-COMPOSITES; VISCOELASTIC CHARACTERIZATION

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2007.455

Publication date: 2007-04-01

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