Cure characterization of triglycidyl epoxy/aromatic amine systems

Padma, A and Rao, RMVGK and Subramaniam, C and Nagendrappa, G (1995) Cure characterization of triglycidyl epoxy/aromatic amine systems. Journal of Applied Polymer Science, 57 (4). pp. 401-411.

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The curing of triglycidyl para-aminophenol (TGPAP) epoxy resin with three aromatic amine hardeners, diaminodiphenye sulphone (DDS), pyridinediamine (PDA), and toluenediamine (TDA), has been investigated. A series of isothermal cures was conducted and analyzed by Fourier transform infrared spectrometry (FTIR) and differential scanning calorimetry (DSC). The chemical reactions occurring during cure were monitored at different temperatures by qualitative and quantitative estimation of different groups in the IR spectra, and the ratio of rate constants (k2/k1) were evaluated. Dynamic DSC analysis of TGPAP/TDA resulted in two exothermal peaks, indicating cure kinetics different from those of TGPAP/DDS and TGPAP/PDA systems, which gave a single exothermal peak. Various kinetic parameters such as total heat of reaction ?H?, activation energy Ea, Frequency factor z, and order of reaction n were evaluated for all the three systems. From the initial kick-off temperatures and activation energy values it was concluded that the rate of curing followed the order TDA amp;gt; PDA amp;gt; DDS. The reaction conversions during cure, evaluated from IR analysis, were exactly the same as those obtained from DSC Borchardt-Daniels kinetics. Using this model, the plots of time vs. temperature for different conversions were constructed for all the three systems; on the basis of these, the cure cycles can be fixed.

Item Type: Article
Uncontrolled Keywords: Activation energy; Amines; Characterization; Chemical reactions; Curing; Differential scanning calorimetry; Estimation; Fourier transform infrared spectroscopy; Infrared spectroscopy; Reaction kinetics; Aromatic amine hardener; Cure kinetics; Diaminodiphenye sulphone; Pyridinediamine; Rate constant; Toluenediamine; Total heat of reaction; Triglycidyl epoxy/aromatic amine systems; Triglycidyl paraaminophenol epoxy resin; Epoxy resins;
Subjects: AERONAUTICS > Aircraft Stability and Control
Depositing User: Mr Vijaianand SK
Date Deposited: 07 Jan 2005
Last Modified: 24 May 2010 04:08

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