Resumo (PT):
Abstract (EN):
The characterization of the extensional rheology of polymeric solutions is important in several applications and industrial processes. Filament stretching and
capillary breakup rheometers have been developed to characterize the extensional properties of polymeric solutions,
mostly for high-viscosity fluids. However, for low concentration polymer solutions, the measurements are difficult
using available devices, in terms of the minimum viscosity and relaxation times that can be measured accurately.
In addition, when the slow retraction method is used, solvent evaporation can affect the measurements for volatile
solvents. In this work, a new setup was tested for filament breakup experiments using the slow retraction method,
high-speed imaging techniques, and an immiscible oil bath
to reduce solvent evaporation and facilitate particle tracking
in the thinning filament. Extensional relaxation times above
around 100 μs were measured with the device for dilute and
semi-dilute polymer solutions. Particle tracking velocimetry
was also used to measure the velocity in the filament and
the corresponding elongation rate, and to compare with the
values obtained from the measured exponential decay of the
filament diameter.
Language:
English
Type (Professor's evaluation):
Scientific
No. of pages:
10