Transformation kinetics of liquid-crystallines based on 1,4-phenylene 4-n-Alkylbenzoate-4-Allyloxybenzoate by DSC

被引：0
|
作者：
Bo, ZL [1 ]
Shen, YP [1 ]
机构：
[1] SHANGHAI MED UNIV,SCH PHARM,SHANGHAI 200032,PEOPLES R CHINA
来源：
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS | 1997年 / 29卷 / 05期
关键词：
D O I：
10.1002/(SICI)1097-4601(1997)29:5<317::AID-KIN1>3.0.CO;2-X
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The transformation kinetics of a series of liquid-crystallines based on 1,4-phenylene 4-n-alkybenzoate-4-allyloxybenzoate (PABAOB) was studied by nonisothermal methods using differential scanning calorimetry. These determinations led to the values of activation energy of transformation from 691.3 to 628.3 kJ/mol, respectively The values of the Avrami exponent n were from 3.0 to 2.6. The values of transformation activation energy decreased with the ascending of alkyl. The result shows that the process of transformation of PABAOB is a constant number of nuclei growing in three dimensions at constant rate and the crystal growth being controlled probably by a diffusion process. (C) 1997 John Wiley & Sons, Inc.
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页码：317 / 321
页数：5
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