Conductive carbon nanotube/poly(ethylene terephthalate glycol- modified) (SWCNT/PETG) composites were prepared via in situ polymerization with the assistance of sonication methods. Scanning electron microscopy (SEM) and dielectric spectroscopy were used to characterize the thin films. Electronic microscopy images reveal that the nanocomposites exhibit well dispersed nanotubes. Wide angle X-ray scattering (WAXS) showed that nanocomposite films are amorphous (small peaks’ intensity) and therefore polymer crystallinity did not affect electrical properties. A sharp insulator-to-conductor transition for PETG/SWCNTs films was observed with a percolation threshold  as low as 0.048wt.%. Synthesis process was conducted in the presence of non-typical, non-classical catalyst- germanium dioxide. This approach may be suitable to obtain nanocomposites with appropriate CNTs dispersion in the PETG matrix with relatively high electrical conductivity.

PETG, thin conductive films, dielectric spectroscopy, in situ polymerization.