Abstract
Epoxy networks of the diglycidyl ether of bisphenol A (DGEBA) were prepared using 4, 4′-diaminodiphenyl (44′DDS) and 3, 3′-diaminodiphenyl (33′DDS) sulfone diamines crosslinking hardeners. The structural, linear optical and mechanical properties of the investigated sample were analysed. Dynamic Mechanical Thermal Analysis and wide-angle x-ray diffraction were conducted to select a candidate presenting interesting thermo-mechanical properties and particular nanostructures embedded in an amorphous matrix. Our choice is therefore focused on DGEBA/33′DDS polymer for which, rocking curve measurements revealed the existence of two principal reflecting planes inclined to each other by about 0.27°. To highlight the potential effect of these interfaces, Thermally Stimulated Depolarization Current (TSDC) and Time Domain Spectroscopy measurements have been carried out. The application of the windowing polarization TSDC technique, in DGEBA/33′DDS polymer sample, gives an almost linear variation of the activation energies in the range between 3.65 and 4.09 eV. To our knowledge, this is the first study concerning epoxy polymers in which activation energies associated to ρ interfacial charge relaxations are calculated. To study the effect of the interfaces and trapped charge carriers, correlated by the angle x-ray diffraction measurements, the optical parameters were investigated. Our contribution will open a new avenue for developing the DGEBA/33′DDS polymer sustainable candidate in optoelectronic engineering applications.
Highlights
Epoxy resins are one of the most important classes of thermosetting resins and are extensively used in many fields such as adhesion, heat and corrosion resistance as well as mechanical and electrical properties
Fourier transform infrared spectroscopy (FTIR) spectra results for diglycidyl ether of Bisphenol A (DGEBA)/diaminodiphenyl sulfone (DDS) polymers FTIR can provide fundamental information on the molecular structure of organic and inorganic components, and is one of the most versatile analytical techniques for the non-destructive, chemical characterization of geological samples
Both DGEBA/ DDS curing reaction can result of significant changes of the chemical structure of the molecule and these changes may be reflected in the IR spectrum of the system
Summary
Epoxy resins are one of the most important classes of thermosetting resins and are extensively used in many fields such as adhesion, heat and corrosion resistance as well as mechanical and electrical properties. Epoxy resins based on the diglycidyl ether of Bisphenol A (DGEBA) are treated as a modeling system to study epoxy networks by simple aromatic amines. Due to their high strength, low creep, very low shrinkage and good performance at high temperatures, epoxy polymers are widely used in industry, as adhesives, surface coatings and as matrixes for fiber-reinforced plastics. Chemical, mechanical and optical properties of the cured epoxy resin in comparison with the aliphatic ones [7]. The diglycidyl ether of Bisphenol A (DGEBA) epoxy prepolymer was cured with 4,4′diaminodiphenyl sulfone (44′DDS) and 3,3′-diaminodiphenyl sulfone (33′DDS) network groups. UV–visible absorption data were reported and optical parameters such as refractive index and optical band gap were calculated and discussed based on literature
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