Kinetics of Epoxy–Amine Curing Accompanied by the Formation of Liquid Crystalline Structure

✍ Scribed by Sergey Vyazovkin; Alice Mititelu; Nicolas Sbirrazzuoli

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 151 KB
• Volume: 24
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200300023

✦ Synopsis

Abstract

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.

magnified imageThe 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.