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Kinetics of Epoxy–Amine Curing Accompanied by the Formation of Liquid Crystalline Structure
Author(s) -
Vyazovkin Sergey,
Mititelu Alice,
Sbirrazzuoli Nicolas
Publication year - 2003
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200300023
Subject(s) - diglycidyl ether , epoxy , differential scanning calorimetry , activation energy , curing (chemistry) , isothermal process , materials science , ether , polymer chemistry , kinetics , chemical engineering , amine gas treating , liquid crystalline , crystallography , chemistry , organic chemistry , composite material , polymer , thermodynamics , bisphenol a , physics , quantum mechanics , engineering
The curing of a mesomorphic epoxy has been studied by polarized light microscopy (PLM) and differential scanning calorimetry. PLM in combination with wide‐angle X‐ray diffraction proves the formation of a liquid crystalline (LC) structure. An advanced isoconversional method reveals that the formation of the LC structure is accompanied by a dramatic decrease in the effective activation from ∼60 to ∼10 kJ · mol −1 . A kinetic model of the phenomenon has been discussed.The dependence of the activation energy on the extent of conversion for isothermal curing of the diglycidyl ether of 4,4′‐dihydroxybiphenyl/2,6‐diaminopyridine (diamonds) and DGEBA/2,6‐diaminopyridine (circles) systems.