The influence of high-energy electron irradiation (E e = 1.8 MeV) on the structure and the vibration properties of multi-walled carbon nanotubes (MWCNTs) in a width range of absorption doses (3 -10) MGy were investigated by means of X-ray diffraction and Raman spectroscopy. It has been observed that the radiation promotes the weakness of the interlayer interactions as well as the damage of the cross-linking along a radial direction, due to occurrence of the sp 3 -hybridized states. The filling of polyvinyl chloride (PVC) by nanotubes, in low content (0.2 and 0.5 wt%), leads to an amplification of the microhardness. This can be attributed to the existence of donor-acceptor interactions between polymeric macromolecules and nanotubes, which promotes a reduction of infringements in the conjugation chain of the polyene consistencies. However, the corresponding Raman spectrum cannot explain such enhancement of the microhardness.
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