Modification and characterization of an Iranian montmorillonite as a corrosion/mechanical promoter for epoxy coatings

Abstract

Iranian montmorillonite (MMT) was modified with hexadecyltrimethylammonium bromide (HDTB) and used as a nano-additive for the enhancement of the mechanical and anticorrosion properties of an epoxy coating. Infrared (IR) spectroscopy, thermo-gravimetric analysis (TGA), transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis indicated that HDTB reacted with MMT (with 97% yield) and increased the d001 spacing of MMT from 1.27 to 3.92 nm. Some 1, 3 and 5 wt.% of organically modified montmorillonite (OMMT) were added to the epoxy coating formulation. XRD and TEM/image processing analysis showed that the extent of intercalation/exfoliation of OMMT was substantially greater than that of MMT. Dynamic mechanical analysis showed that the glass transition temperature and storage modulus increased significantly with the addition of OMMT. Electrochemical impedance spectroscopy (EIS) and salt spray/image processing results revealed that addition of OMMT to the epoxy coating significantly increased the corrosion resistance of the coating compared to neat and MMT-containing epoxy coatings. The optimum concentration of OMMT was 3 wt.%. At this concentration, the mechanical and anticorrosion properties were greatly superior to those of neat and MMT-containing epoxy coatings.

A Yellow Lead-Free Pavement Marking Paint Based on Hybrid Dye-Clay Nanopigment: Morphological, Thermomechanical, and Photophysical Properties

“…Similar results have been reported in other studies. The incorporation of clay-based fillers has been reported to increase the T g up to 20 °C for various polymers. − The higher value of T g for the paint film colored with DCNP (vs neat paint film) reveals a favorable effect of DCNP on the paint’s thermomechanical stability that would be very critical in practical application. If T g of the applied thermoplastic pavement marking is low (somewhere in the vicinity of its application temperature), the paint film would be in or close to its viscoelastic state and thus have low mechanical strength.…”

High-Strength, Low-Permeable, and Light-Protective Nanocomposite Films Based on a Hybrid Nanopigment and Biodegradable PLA for Food Packaging Applications

“…After CER between C20A and MB, the reflection peak experienced a shift from its original position toward a higher angle, 2θ = 3.84°, with a d-spacing value of 2.30 nm that can be ascribed to the replacement of the bulky organic modifiers with the smaller dye and molecular reorientation of organic compounds inside clay layers. 20,32 The reflection peaks disappeared after incorporating 3 wt % C20A and 1, 3, and 5 wt % DCNP in PLA at different loading concentrations. However, a broad shoulder at around 2θ = 2°with a d-spacing value of 4.40 nm was observed for the films containing 3 wt % C20A and 5 wt % DCNP.…”