A kinetics study of crystallization from discotic mesophases
作者:
ZIRU HE,
YUE ZHAO,
ALAIN CAILLE,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 23,
issue 3
页码: 317-325
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997208244
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The polymorphism of hexa- n -octanoate of rufigallol (RHO) was used to investigate the crystallization kinetics when starting from two different discotic mesophases, namely, a hightemperature enantiotropic mesophase and a low-temperature monotropic mesophase. In all cases, an Avrami exponent of n 3 was obtained, suggesting two-dimensional sporadic nucleation and growth. Although the same overall mechanism was predicted to operate for all crystallization temperatures investigated, the Avrami constant b has a temperaturedependence which is different for different starting columnar phases, indicating a strong influence on the rates of nucleation and of growth of the different molecular arrangements of the starting mesophases. Differential scanning calorimetry was used for the studies, supplemented by direct observations through optical polarizing microscopy.
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