Journal
CHEMICAL PHYSICS LETTERS
Volume 601, Issue -, Pages 13-15Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2014.03.056
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Funding
- Government of Russian Federation [074-U01]
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Fullerene C-60/epoxy polymer nanocomposites with different C-60 loading (0.0- 0.08 wl.%) have been prepared. Mechanical testing shows that compared with neat epoxy, mechanical and toughening properties of the composites are greatly improved. Dielectric spectroscopy was used to investigate the influence of nanoparticles on the relaxation processes in the polymer matrix. Our study shows that presence of fullerene hampers molecular motions in the epoxy composites that leads to hardening of polymer chains and impedes secondary relaxation processes, which explains the increase of Young's modulus of the nanocomposites. It was found that the activation energy of beta relaxation process decreases for nanocomposites. This finding allows us to confirm the energy-dissipating mechanism that leads to enhanced toughness of nanocomposites. (C) 2014 Elsevier B.V. All rights reserved.
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