Abstract
The flow properties during capillary extrusion of quasi-nano-meter calcium carbonate-filled acrylonitrile-butadiene-styrene copolymer (ABS) composite and an unfilled ABS resin melts were measured by using a Rosand capillary rheometer to identify the effects of test operation conditions on the rheological behavior of the sample melts. The experiments were conducted under the following test conditions: temperatures varied from 200 to 240 C and shear rate range of 10-104 s 1. The results showed that the shear flow for both the filled ABS and the unfilled ABS resin melts did not obey strictly the power law at high shear rates, and the entry pressure drop (Pen) and the extension stress (e) in entry flow increased nonlinearly, while the melt shear viscosity (s) and extension viscosity (e) decreased with the increasing wall shear stress (w) at constant test temperature. The dependence of the melt shear viscosity on the test temperature was approximately consistent with the Arrhenius expression at fixed w. At the same test conditions, the values of s, e, and w for the filled ABS resin were higher than those for the unfilled ABS, while the values of e and Pen for the former were lower than those for the latter.
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