Gap‐dependence of the viscosity of a thermotropic liquid crystalline copolymer
作者:
Douglass S. Kalika,
Laurent Nuel,
Morton M. Denn,
期刊:
Journal of Rheology
(AIP Available online 1989)
卷期:
Volume 33,
issue 7
页码: 1059-1070
ISSN:0148-6055
年代: 1989
DOI:10.1122/1.550007
出版商: The Society of Rheology
关键词: VISCOSITY;LIQUID CRYSTALS;COPOLYMERS;SHEAR;ORGANIC ACIDS;HYDROXY COMPOUNDS;RHEOLOGY
数据来源: AIP
摘要:
We have measured the shear and complex viscosities of a thermotropic liquid crystalline copolymer ofp‐hydroxybenzoic acid and 2,6‐hydroxynaphthoic acid as a function of capillary diameter and parallel‐plate gap spacing. In constrast to a study by Wissbrun, Kiss, and Cogswell, who reported that the viscosity increases significantly at small gaps, we find no dependence on the capillary diameter and a smalldecreasein complex viscosity with parallel‐plate spacing. In an appendix we address an experimental artifact that can lead to an apparent decrease of the viscosity with gap spacing even for flexible polymers.
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