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This paper focuses on monitoring of carbon nanotube (CNT) network development
during the cure of unsaturated polyester nanocomposites by means of electrical
impedance spectroscopy. A phenomenological model of the dielectric response is
developed using equivalent circuit analysis. The model comprises two parallel RC
elements connected in series, each of them giving rise to a semicircular arc in
impedance complex plane plots. An established inverse modelling methodology is
utilized for the estimation of the parameters of the corresponding equivalent
circuit. This allows a quantification of the evolution of two separate processes
corresponding to the two parallel RC elements. The high frequency process, which
is attributed to CNT aggregates, shows a monotonic decrease in characteristic
time during the cure. In contrast, the low frequency process, which corresponds
to inter-aggregate phenomena, shows a more complex behaviour explained by the
interplay between conductive network development and the cross-linking of the
polymer
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