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Effect of organically modified montmorillonite filler on the dynamic cure kinetics, thermal stability, and mechanical properties of brominated epoxy/aniline formaldehyde condensates system

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Abstract

Nanocomposites, based on tetrabromo-bisphenol-A epoxy and aniline formaldehyde condensates, containing 5 and 10 % organically modified montmorillonite (O-MMT), were prepared. The morphologies of these nanocomposites were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The influences of O-MMT on the dynamic cure kinetics, thermal stability, and mechanical properties were investigated by differential scanning calorimetry, thermogravimetric analysis, and non-destructive ultrasonic testing techniques. The XRD and SEM results indicated a good dispersion of O-MMT within the epoxy matrix. The relation between the activation energy, E a, and the degree of cure, α, for the examined systems was obtained by applying model-free isoconversional Kissinger–Akahira–Sunose method. As α increases, E a increases gradually, almost independent of the amount of O-MMT. The dynamic cure kinetics of the neat epoxy system as well as its nanocomposites were described by Šestàk–Berggren, [SB (m, n)], autocatalytic model. The O-MMT enhances the thermal stability of the examined epoxy system. The results of the mechanical properties indicated that the addition of O-MMT enhances the Young’s and shear elastic modulus and microhardness. The values of these parameters increase with increasing O-MMT loading.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Cairo University, Giza, 12163, Egypt

    Gamal R. Saad & Hala F. Naguib

  2. Science and Technology Center of Excellence, Ministry of Military Production, Cairo, Egypt

    Said A. Elmenyawy

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  1. Gamal R. Saad
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  2. Hala F. Naguib
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  3. Said A. Elmenyawy
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Correspondence to Gamal R. Saad.

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Saad, G.R., Naguib, H.F. & Elmenyawy, S.A. Effect of organically modified montmorillonite filler on the dynamic cure kinetics, thermal stability, and mechanical properties of brominated epoxy/aniline formaldehyde condensates system. J Therm Anal Calorim 111, 1409–1417 (2013). https://doi.org/10.1007/s10973-012-2515-z

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