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Curing Kinetics of Diglycidyl Ether of Bisphenol A and Diaminodiphenylmethane Using a Mechanistic Model
Author(s) -
Liu Guodong,
Zhao Bin,
Zhou Xiaofang,
Wang Jiaxi,
Gao Jungang,
Qu Xiongwei,
Zhang Liucheng
Publication year - 2006
Publication title -
macromolecular theory and simulations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 56
eISSN - 1521-3919
pISSN - 1022-1344
DOI - 10.1002/mats.200500060
Subject(s) - diglycidyl ether , curing (chemistry) , kinetics , autocatalysis , epoxy , differential scanning calorimetry , bisphenol a , reaction rate constant , isothermal process , chemical kinetics , polymer chemistry , ether , chemistry , materials science , reaction rate , thermodynamics , organic chemistry , catalysis , physics , quantum mechanics
Summary: The curing kinetics of diglycidyl ether of bisphenol A (DGEBA) and 4,4′‐diaminodiphenylmethane (DDM) was analyzed using isothermal differential scanning calorimetry (DSC) modes by using a simple mechanistic model which includes two rate constants, k 1 and k 2 , two reaction orders, n 1 and n 2 , and the ratio of initial concentration of hydroxyl group to initial epoxy concentration, c 0 . Analyses of DSC data indicated that an autocatalytic reaction existed in the curing process. The mechanistic model proposed in this paper fits the experimental data exactly. Rate constants, k 1 and k 2 have been found to increase with rising curing temperature. The activation energies for the relative reactions were determined to be 66.00 ± 4.21 and 50.74 ± 8.92 kJ/mol, respectively. The complex equivalent constant, K , decreased with increasing temperature. Diffusion control was incorporated to describe the cure in the latter stages.Comparison of experimental data with the mechanistic model for the curing kinetics of DGEBA with DDM.