Carbon nanofibers (CNFs) and carbon nanotubes (CNTs) are considered as potential fillers for improving the mechanical, thermal, and electrical properties of polymer and polymer composites. One of the applications is to enhance the electrical conductivity of polymer by using CNFs as fillers. This kind of treatment will be useful in the situations where electrostatic dissipation capability of the polymer part is important. This paper presents an investigation of the electrical resistivities of CNF/polymer suspensions of different CNF concentrations, i.e., 2.0wt%, 3.0wt%, 4.5wt%, and 6.0wt%. For determining the electrical resistivities of the CNF/polymer suspensions, a DC-sensor was constructed and used in the experiments. The experimental results indicate that the electrical resistivity of the CNF-polyester suspension decreases as CNF weight fraction increases. In addition, the results show a dramatic decrease of the resistivity when the measurement time prolongs. An empirical model to predict the electrical resistivity evolution of the CNF/polyester suspension was proposed in this paper. Good agreement between the empirical model predictions and the experimental results was found.

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