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Structure and metal type effects on cure kinetics of DGEBA with benzil bisthiosemicarbazone complexes
Author(s) -
Ghaemy Mousa,
Behmadi Hossein
Publication year - 2007
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.27620
Subject(s) - diglycidyl ether , curing (chemistry) , epoxy , benzil , differential scanning calorimetry , kinetics , polymer chemistry , materials science , metal , bisphenol a , activation energy , chemistry , composite material , organic chemistry , catalysis , thermodynamics , physics , quantum mechanics , metallurgy
The curing reaction kinetics of the diglycidyl ether of bisphenol A‐ (DGEBA) based epoxy was investigated according to the change of curing agents. Complex curing agents based on Ni(II) and Cu(II) chelates with benzil bisthiosemicarbazone (LH 6 ) as a ligand was studied using differential scanning calorimetry. The curing reaction was characterized by high‐activation energies ( E a ), cure onset ( T i ), and peak maximum ( T p ) temperatures. Dynamic kinetic parameters were calculated by using Kissinger and Ozawa methods. For the NiLH 6 Cl 2 , CuLH 6 Cl 2 , and LH 6 the average values of E a were calculated to be 165.16, 165.92, and 115.75 kJ/mol, respectively. For the NiLH 6 Cl 2 systems, their activation energies at 40 and 30 phr are equal. The T i and T p of the DGEBA/NiLH 6 Cl 2 system are lower than those of DGEBA/CuLH 6 Cl 2 system. These results indicate that NiLH 6 Cl 2 has a higher reactivity toward epoxy resin at the beginning of the curing reaction. The effect of hardener concentration, heating rate, and type of metal ion on the cure kinetic parameters and the shape of DSC thermograms were investigated. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008