Polystyrene PS648 outlet optical birefringence pattern, piston speed 1.0mm/s
The optical birefringence pattern obtained from polystyrene PS648 flowing through a narrow slit. Experiment conducted on the Cambridge Multi Pass Rheometer (MPR4) at a piston speed of 1.0 mm/s at 170C. Video shows the outlet flow (from top to bottom).
Conditions: Material=DOW polystyrene PS648, Mw~333kg/mol, polydispersity~2.0, Temperature=170 degrees celsius, Piston speed=1.00mm/s, slit width=0.6mm, slit length=8mm, slit depth=10mm