Formation of a Banded Texture in Solutions of Liquid-Crystalline Polymers 11. Poly(n-Hexylisocyanate) in Toluene
作者:
E. Marsano,
L. Carpaneto,
A. Ciferri,
Y. Wut,
期刊:
Liquid Crystals
(Taylor Available online 1988)
卷期:
Volume 3,
issue 11
页码: 1561-1567
ISSN:0267-8292
年代: 1988
DOI:10.1080/02678298808086695
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The kinetics of band formation has been followed during the relaxation of anisotropic solutions of poly(n-hexylisocyanate) in toluene previously subjected to a shear rate, for a time ts. There is a threshold at low, or ts, below which bands do not appear (formation timetb→ ∞). Past the threshold,tsdecreases with either orts, and eventually bands are seen immediately after stopping the flow (tb= 0). However, for still larger particularly for the more viscous solutions and when the flowing solution is well oriented, tbmay increase again. The results are similar to those already reported for hydroxypropylcellulose in water and support a previous suggestion for the origin of the banded texture.
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