Exploring the optical and dielectric properties of bifunctional and trifunctional epoxy polymers

Two polymers were prepared from diglycidyl ether of bisphenol A (DGEBA) and triglycidyl p-aminophenol (TGAP) epoxy resins, using the same hardener diethylenetriamine (DETA). The obtained polymers were compared in terms of structural, optical, mechanical, thermal and dielectric properties. Dielectric...

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Bibliographic Details
Published in:Polymer (Guilford) 2021-07, Vol.228, p.123882, Article 123882
Main Authors: Jdidi, Haythem, Fourati, Najla, Zerrouki, Chouki, Ibos, Laurent, Fois, Magali, Guinault, Alain, Jilani, Wissal, Guermazi, Samir, Guermazi, Hajer
Format: Article
Language:English
Subjects:
Activation energy
Aminophenol
Bisphenol A
Dielectric properties
Dielectric relaxation
Diethylene triamine
Direct and indirect optical bandgap
Dynamic mechanical analysis
Electrical properties
Electrical resistivity
Energy transition
Engineering Sciences
Epoxy resins
Epoxy-based polymers
Modeling
Optical properties
p-Aminophenol
Polymers
Relaxation
Spectroscopy
Ultraviolet radiation
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Summary:Two polymers were prepared from diglycidyl ether of bisphenol A (DGEBA) and triglycidyl p-aminophenol (TGAP) epoxy resins, using the same hardener diethylenetriamine (DETA). The obtained polymers were compared in terms of structural, optical, mechanical, thermal and dielectric properties. Dielectric spectroscopy and dynamic mechanical analysis indicated the presence of dipolar dielectric relaxations in both polymers, and interfacial one only for TGAP/DETA, which is consistent with XRD findings. Different approaches were considered to fit electrical modulus and conductivity and to estimate the relaxation times and activation energies according to temperature. For optical measures, a novel result processing approach is proposed for an accurate determination of the polymers bandgap and for highlighting the existence of additional energy transition level for TGAP. Results indicate that this polymer could be a potential candidate for use as a protective film and as UV/blue-light filter for screens and windows. [Display omitted] •Rational method discriminating between direct and indirect optical bandgaps.•Absorption in the violet-bleu ascribed to the existence of energy levels in the gap.•Possible use of TGAP polymer as screen/window protective film and blue-light filter.•Enhancement of conductivity of more than two orders of magnitude.•Arrhenius and VFT modeling for characterizing thermally activated relaxations.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2021.123882