Abstract
Polyetheretherketone (PEEK)/multiwall carbon nanotube (MWCNT) composites were fabricated via injection moulding and successively characterized by means of microstructural, morphological, thermal and mechanical investigations. Scanning electron microscopy observations demonstrated a uniform distribution of CNT within the matrix, while tensile tests revealed an unexpected high strain at rupture (up to 140%), despite the insertion of CNT ensured an increase of modulus and strength. DSC analysis showed that CNT addition did not cause any significant increase in crystallinity of PEEK, and therefore it was concluded that the nanotubes acted as confinement of polymer chains, hindering chain mobility. XRD showed the typical PEEK and MWCNT peaks, without evidencing the presence of any different phase. The strain at fracture of samples tested after annealing returned to values compared with those of neat PEEK.
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