Transient and steady‐state rheology of a liquid crystalline hydroxypropylcellulose solution
作者:
Nino Grizzuti,
Silvana Cavella,
Paolo Cicarelli,
期刊:
Journal of Rheology
(AIP Available online 1990)
卷期:
Volume 34,
issue 8
页码: 1293-1310
ISSN:0148-6055
年代: 1990
DOI:10.1122/1.550139
出版商: The Society of Rheology
关键词: Liquid crystalline polymers;Transient shear flow;Polydomain structure;Hydroxypropylcellulose;AQUEOUS SOLUTIONS;RHEOLOGY;LYOTROPIC CRYSTALS;HYDROXY COMPOUNDS;PROPYL COMPOUNDS;CELLULOSE;TIME DEPENDENCE;SHEAR
数据来源: AIP
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 of shear and oscillatory shear flow) suggest the presence of a supramolecular structure which is modified by the flow. The characteristic time of structure evolution is estimated, and a tentative explanation of such a process is suggested in terms of polydomain rearrangement. Steady‐state measurements confirm some peculiar properties of liquid crystalline polymers, such as the presence of a shear thinning regime at the lowest shear rates and the occurrence of negative values of the first normal stress difference. Finally, an anomalous, yet reproducible, behavior of the dynamical properties is reported and discussed.
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