Effects of curing agent on conductivity, structural and dielectric properties of an epoxy polymer. (19th November 2015)

• Record Type: Journal Article
• Authors: Jilani, Wissal; Mzabi, Nissaf; Fourati, Najla; Zerrouki, Chouki; Gallot-Lavallée, Olivier; Zerrouki, Rachida; Guermazi, Hajer
• Is Part Of: Polymer. Volume 79(2015)
• Page Start: 73
• Page End: 81
• Publication Date: 2015-11-19
• Subjects: Diglycidyl ether of bisphenol A (DGEBA) -- Structural characterization -- Dielectric relaxations; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2015.09.078
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Two epoxy polymers were prepared by curing the diglycidyl ether of bisphenol A (DGEBA) epoxy resin with two hardeners: the ethylenediamine (EDA) and the 3, 3′-diaminodiphenyl sulfone (33′DDS) which are respectively aliphatic and aromatic. Structural properties of DGEBA/EDA and DGEBA/33′DDS polymers were investigated by means of grazing incidence X-ray reflectometry. Their dielectric properties were studied using the dielectric relaxation spectroscopy (DRS) over wide ranges of temperature (from −80 to 200 °C) and frequency (from 10 −1 –10 6 Hz), and thermally stimulated depolarization current (TSDC) technique. X-ray data revealed the presence of a locally periodic nanostructure in polymer cured with the aromatic hardener (DGEBA/33′DDS). γ and α dipolar relaxations were highlighted for the two polymers while the Maxwell–Wagner–Sillars (MWS) relaxation appears only in the DGEBA/33′DDS. The electric modulus data were fitted using Havriliak–Negami approch. Conductive properties of epoxies were investigated. Ac conductivity data reveal that DGEBA/EDA is more conductive than the DGEBA/33′DDS. Graphical abstract: Highlights: Two epoxy polymers were prepared by curing (DGEBA) with (EDA) and the (33′DDS). X-ray data reveal the presence of a locally periodic nanostructure in DGEBA/33′DDS. γ and α dipolar relaxations were highlighted for the two polymers. Maxwell Wagner Sillars (MWS) relaxation appears only in the DGEBA/33′DDS. DGEBA/EDA is more conductive than the DGEBA/33′DDS.