Abstract
Epoxy polymer nanocomposites filled with magnetite (Fe3O4) clay (B), named (B-DPA-PANI@Fe3O4) have been prepared at different filler loading (0.1, 0.5, 1, 3, 5 wt. %). The surface modification of clay by polyaniline (PANI) is achieved in the presence of 4-diphenylamine diazonium salt (DPA). The effects of the nanofiller loading on Tensile, mechanical and dielectric properties were systematically studied. Improved properties was highlighted for all reinforced samples. The addition of only 3 wt. % of the filler enhanced the tensile strength of the composites by 256%, and the glass transition temperature Tg by 37%. The dielectric spectra over a broad frequency showed a robust interface between the hybrid (B-DPA-PANI@Fe3O4) fillers and epoxy matrix. The results showed most significant improvement in corrosion inhibition using electrochemical impedance spectroscopy (EIS) in 3.5 wt % NaCl, as well as a significant response in oil sensing test. High charge transfer resistance of 110 × 106 Ω.cm2 using 3-wt % of filler was noted compared to 0.35 × 106 Ω.cm2 for the pure epoxy. The results obtained herein will open new routes for the preparation of efficient anticorrosion sensor coatings.
Highlights
Nowadays, Intensive research was devoted to design a smart and intelligent multifunctional hybrid polymer nanocomposite materials for emerging applications[1,2]
The B-DPA-PANI@Fe3O4 hybrid magnetite filler were prepared with reference to mechanochemical synthesis process[65]
The B-DPA-PANI@Fe3O4 hybrid magnetite filler were prepared with reference to mechanochemical synthesis process[65] in order to get a homogeneous particle distribution inside clay galleries
Summary
Effect of Diazonium Cation and Fe3O4 Intercalation on clay/Polyaniline Properties. The B-DPA-. PANI conductive hybrid fillers were initially prepared by the covalent bonding of the diazonium cation to bentonite surface, followed by the oxidative polymerization of the aniline monomer as formerly reported[24]. The B-DPA-PANI@Fe3O4 hybrid magnetite filler were prepared with reference to mechanochemical synthesis process[65] in order to get a homogeneous particle distribution inside clay galleries. The as prepared hybrid magnetite filler has highly dispersed and stable Fe3O4 nanoparticles, NH groups from both DPA and PANI, which could react with epoxy groups via ring opening, resulting in covalent bonding of the resin to the clay sheets (via PANI and DPA). The introduction of the diazonium salt and Fe3O4 are important to prepare a new conductive and exfoliated hybrid filler. For the B-DPA-PANI@Fe3O4, diffraction peaks appeared at ∼30°, 35°, 43°, 53°, 57° and 62°, which may be assigned to (220), (311), (400), (422), (511) and (440), respectively—the inverse spinel phase of Fe3O4 (JCPDS 01-1111)
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