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Transformation kinetics of liquid‐crystallines based on 1,4‐phenylene 4‐n‐alkylbenzoate‐4‐allyloxybenzoate by DSC
Author(s) -
Bo Zhonglin,
Shen Yiping
Publication year - 1997
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(1997)29:5<317::aid-kin1>3.0.co;2-x
Subject(s) - chemistry , activation energy , differential scanning calorimetry , kinetics , transformation (genetics) , phenylene , thermodynamics , diffusion , exponent , reaction rate constant , crystallography , polymer chemistry , polymer , organic chemistry , biochemistry , physics , quantum mechanics , gene , linguistics , philosophy
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. © 1997 John Wiley & Sons, Inc. Int J Chem Kinet 29: 317–321, 1997