Prior to the microlayered coextrusion, the PPCB pellets with
different amounts of CB were prepared using a twin-screw
extruder. The mixing temperature gradientwas varied between 170
and 200 C from hopper to die. A multilayered coextrusion equipment
shown in Fig. 2a, consisting of two single-crew extruders,
a feedblock and some multiplying elements, was built to prepare
the layered PP/PPCB composites.