Interfacial effects on the viscosity and the morphology of a thermotropic liquid crystalline polymer

The apparent vicosity of nematic liquid crystal polyester measured by using capillary-tube viscometers shows a dependence on tube diameter and a yield stress in the low shear rate region called Region I. When the wall thickness measured by SEM is subtracted from the tube diameter, the viscosity beco...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 1988-10, Vol.20 (4), p.399-405
Main Authors: Shin, BooYoung, Chung, InJae
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Miscellaneous
Organic polymers
Physicochemistry of polymers
Properties and characterization
Online Access:Get full text
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Summary:The apparent vicosity of nematic liquid crystal polyester measured by using capillary-tube viscometers shows a dependence on tube diameter and a yield stress in the low shear rate region called Region I. When the wall thickness measured by SEM is subtracted from the tube diameter, the viscosity becomes independent of tube diameter but still shows the Region I. This behaviour may be caused by the molecular orientation at the wall of the capillary-tube. 15 ref.--AA
ISSN:0170-0839
1436-2449
DOI:10.1007/BF00255743