Abstract: The dynamic rheological behavior of the high-density polyethylene(HDPE) filled with carbon black(CB), or graphite(GP), i.e. HDPE/CB and HDPE/GP composites, was studied. The pseudo-solidlike behavior appearing in high-loaded composites could be attributed to the formation of the filler percolated network structure. In the composites with the same matrix, the filler kind and the geometric parameters of filler(particle shape, particle size and particle size distribution) play an important role in the dynamic rheological properties at low frequencies, the percolation behavior of the rheological parameters and the percolation threshold(φ_c). Compared with the geometric parameters of the filler particles, the filler kind exerts a more striking influence on them. The composites filled with particles having a large surface activity and large specific surface area possess a lower value of φ_c.

Key words: Partices-filled composite material, Rheological behavior, Pseudo-solidlike behavior, Percolation threshold