a shows that unfunctionalized MWCNT are successfully dispersed in phenoxy by melt processing. An excellent dispersion is indeed observed in extruded phenoxy pellets containing 3 wt%. MWCNT, involving individualized nanotubes, homogeneously distributed and randomly orientated with only some small agglomerates. TEM characterization of the corresponding nanocomposite filament is shown in Fig. 1b and c. The MWCNT are still well distributed but with a preferential alignment due to filament preparation.