Transient and steady‐state rheology of a liquid crystalline hydroxypropylcellulose solution

摘要: Cone and plate rheological measurements have been performed on aqueous solutions of hydroxypropylcellulose in the liquid crystalline phase. The time‐ dependent experiments (start‐up shear oscillatory flow) suggest presence a supramolecular structure which is modified by flow. characteristic time evolution estimated, tentative explanation such process suggested terms polydomain rearrangement. Steady‐state confirm some peculiar properties polymers, as thinning regime at lowest rates occurrence negative values first normal stress difference. Finally, an anomalous, yet reproducible, behavior dynamical reported discussed.