  In this paper, 6 different reduced graphene oxide (rGO) were prepared by a
modified Hummers method and reduced by thermochemical methods. rGO materials
were intentionally prepared to obtain different BET and thickness and oxygen
content maintaining constant the lateral size to compare its performance on
thermoplastic polyurethane (TPU) matrix. Microstructure and the effect of the
incorporation of rGO on the hardness and electrical properties of TPU were
investigated. It has been studied the temperature and humidity dependence of
the electrical conductivity and the sensitivity and the response time to
humidity changes have been determined. Influence of the filler content,
temperature and humidity on the Jonschers universal power law (UPL) for ac
conductivity vs frequency and its fitting parameters A and n were determined.
It has been observed an anomalous behaviour (according to UPL) and a linear
correlation between log A and n independently of the filler content, humidity
and temperature, however there is an influence of the rGO used for the
preparation of the composite. To study the transport mechanisms the
experimental results were adjusted to the equation and the maximum adjustment
for like other carbon nanocomposites however there is not an unequivocal
behaviour.
