Anticorrosive performance of epoxy/modified clay nanocomposites

Abstract

The effect of 2‐benzylbenzimidazole (2‐BBI) was evaluated as surface modifier on the performance of Na+‐Montmorillonite nanoparticles (Na+‐MMT) in epoxy‐based coatings. Four epoxy‐based samples were prepared including 0, 1, 2, and 3 wt% of 2‐BBI‐(Na+‐MMT). The intercalation behaviors of epoxy resin in presence of 2‐BBI‐(Na+‐MMT) were determined by X‐ray diffraction (XRD), and field emission scanning electron microscope (FE‐SEM) analysis was carried out to depict the dispersion of 2‐BBI‐(Na+‐MMT). The pertaining reaction bonds of the 2‐BBI and (Na+‐MMT) were represented via Fourier transform infrared spectroscopy (FTIR), and pull‐off test was used for measuring the adhesion strength of the coated samples. Corrosion resistance and thermal properties of the coated samples were measured by electrochemical impedance spectroscopy (EIS) and differential scanning calorimetry (DSC), respectively. On the basis of the EIS results, the coated samples with 3 wt% 2‐BBI‐(Na+‐MMT)/epoxy had the highest corrosion resistance after 120 days immersion in 3.5 wt% NaCl solution. Also, based on the Brusher–Kingsbury equation, the amount of water absorption was calculated, in which 3 wt% 2‐BBI‐(Na+‐MMT)/epoxy had only 1.92% water absorption while 3 wt% (Na+‐MMT)/epoxy had 82 wt%. The results showed that 2‐BBI can improve the dispersion of the Na+‐MMT in the epoxy matrix by entering into their galleries and providing better compatibility between the inorganic clay nanoparticles and polymeric matrix. This issue led to the enhancement of the thermal and barrier properties of 2‐BBI‐modified (Na+‐MMT)/epoxy nanocomposites rather than unmodified ones. POLYM. COMPOS., 39:E2134–E2142, 2018. © 2017 Society of Plastics Engineers

Ca2+-Facilitated Adhesion of Bacteria on the Na-Montmorillonite Surface

“…Na-montmorillonite (Na-MMT) was a well-known double-layered clay mineral. It has many excellent material properties, such as a high specific surface, high cation exchange capacity, and low cost; because of this, it was widely used in many aspects of daily life. − Each crystal sheet of the Na-MMT consists of a central octahedral alumina sheet between two tetrahedral silicon sheets. Due to the substitution of Al 3+ for Si 4+ in the tetrahedral sheet and Mg 2+ for Al 3+ in the octahedral sheet, these crystal sheets retain a negative charge, which is counteracted through the adhesion of cations such as Na + and Ca 2+ . , Na-MMT, as the main component of natural bentonite, was widely studied for use as a sorbent to ensure the immobilization of ionic liquids between clay layers .…”

Blending Modification of Alicyclic Resin and Bisphenol A Epoxy Resin to Enhance Salt Aging Resistance for Composite Core Rods

“…Bisphenol A epoxy resin (DGEBA) is one of the most widely used epoxy resins in various industrial fields because of its excellent thermal properties, electrical insulation properties and physical and mechanical properties. A large number of studies on toughening and weather resistance have been conducted in order to better adapt to various industrial applications [3][4][5][6]. At present, the resin matrix in the composite insulating mandrel mostly adopts bisphenol A epoxy resin, and there have been many studies on the weather resistance modification of bisphenol A epoxy resin.…”