All the systems evaluated presented pseudoplastic behavior,
that is, the apparent viscosity decreased as the shear rate increased.
According to Barnes et al., (1989), this occurs due to orientation of
the molecules in the direction of flow, and the break-up of aggregates,
decreasing the resistance to movement.
The plateau region decreased with increasing concentration,
which is due to the decreasing rate of entanglement formation at
higher concentrations, as well as with the increasing rate of entanglements
disruption that occurs with increasing shear rate
(Chenlo et al., 2010).