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Kinetics of anhydride curing of isophthalic diglycidyl ester using differential scanning calorimetry
Author(s) -
Khanna Umang,
Chanda Manas
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070490212
Subject(s) - differential scanning calorimetry , curing (chemistry) , kinetics , autocatalysis , isothermal process , materials science , order of reaction , polymer chemistry , thermodynamics , epoxy , reaction rate constant , chemistry , composite material , physics , quantum mechanics
The cure reaction of a model diglycidyl ester, bis‐(2,3‐epoxypropyl)‐1,3‐benzenedicarbox‐ylate, with hexahydrophthalic anhydride as the curing agent and benzyldimethylamine as the catalyst, was studied by differential scanning calorimetry using an isothermal approach over the temperature range 100–135°C. The results indicate that the cure reaction is au‐tocatalytic in nature and does not follow simple n th‐order kinetics. A semiempirical equation for autocatalytic systems containing two rate constants and two reaction orders, viz., 0.5 and 1.5, provided a good phenomenological description of the cure kinetics up to the point of vitrification. With the inclusion of a diffusion factor into this model, it was, however, possible to predict with precision the cure kinetics over the whole range of conversion covering both pre‐and postvitrification stages and over the entire temperature range of 100–135°C employed for isothermal curing. © 1993 John Wiley & Sons, Inc.