2.3. Experimental set-up
The rheological measurements in shear flow were carried out using a rotational rheometer Physica
MCR 501 produced by Anton Parr (Germany) equipped with cone-plate measuring system. The
measuring device was equipped with a temperature unit (Peltier plate) that provided very good
temperature control over an extended period of time. All measurement were carried out at T = 20◦C.
Extensional viscosity measurements were made with an opposed-nozzle device of tailored
construction. The scheme of opposed-nozzle rheometer is shown in Fig. 1. That flow geometry with equal
flow rates through both nozzles generates a symmetric flow field with the stagnation plane at the
midpoint between these nozzles.