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A comparative study of structural and dielectric properties of diglycidyl ether of bisphenol A (DGEBA) cured with aromatic or aliphatic hardeners

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Abstract

This study aims to present structural and dielectric comparisons between two epoxy polymers. These polymers are realized by curing diglycidyl ether of bisphenol A (DGEBA) resin with either aliphatic 1,3-diaminopropane (PDA) or aromatic 4,4′-diaminodiphenyl sulfone (DDS) hardeners. They are called DGEBA/PDA and DGEBA/DDS. Several complementary techniques have been used in the present study. The structural analysis was performed using grazing incidence X-ray reflectometry. It reveals the presence of a locally ordered nanostructure in the DGEBA/DDS polymer and an amorphous character for the DGEBA/PDA one. Dielectric characterization was carried by means of dielectric relaxation spectroscopy (DRS), thermally stimulated depolarization current (TSDC) and time domain spectroscopy (TDS). DRS measurements performed over wide ranges of temperature (−80 to 160 °C) and frequency (10−1–106 Hz) showed the presence of dipolar γ and α relaxations in both polymers. Nevertheless, the interfacial Maxwell–Wagner–Sillars (MWS) relaxation appeared only in DGEBA/DDS. This can be related to the local nanostructure within this polymer, which can give rise to interfaces. Relaxation parameters were deduced from the best fits of experimental data with the Havriliak–Negami model. The calculated fragility index indicates that DGEBA/DDS is more fragile than DGEBA/PDA. The loss factor ε′′(f) was calculated from the isothermal discharging current measurements, using Hamon approximation. Thanks to this ε′′ calculation an interfacial relaxation was revealed in the frequency range of 10−3–10−1 Hz for each investigated polymer.

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Acknowledgements

The authors would like to express their gratitude to the High Education and Scientific Research in Tunisia and ICTP through TWAS Grant No. 00-043 319 RG/PHYS/AF/AC for the financial support.

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Authors and Affiliations

  1. Unity of Physics of Insulating and Semi-Insulating Materials, Faculty of Sciences of Sfax, University of Sfax, B.P. 1171, 3000, Sfax, Tunisia

    Wissal Jilani, Nissaf Mzabi & Hajer Guermazi

  2. Grenoble Electrical Engineering Laboratory (G2ELab), Grenoble University Alpes & CNRS (UGA), Grenoble, France

    Olivier Gallot-Lavallée

  3. SATIE, UMR 8029, CNRS, ENS Cachan, Cnam, 292 rue Saint Martin, 75003, Paris, France

    Najla Fourati & Chouki Zerrouki

  4. Université de Limoges, LCSN, 123 Avenue Albert Thomas, 87060, Limoges Cedex, France

    Rachida Zerrouki

  5. Université du Québec à Trois-Rivières, CRML, 3351 boul. des Forges, C.P. 500, Trois-Rivières, QC, G9A 5H7, Canada

    Rachida Zerrouki

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  1. Wissal Jilani
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Correspondence to Wissal Jilani.

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Jilani, W., Mzabi, N., Fourati, N. et al. A comparative study of structural and dielectric properties of diglycidyl ether of bisphenol A (DGEBA) cured with aromatic or aliphatic hardeners. J Mater Sci 51, 7874–7886 (2016). https://doi.org/10.1007/s10853-016-0043-0

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  • DOI: https://doi.org/10.1007/s10853-016-0043-0

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