Seawater Absorption and Adhesion Properties of Hydrophobic and Superhydrophobic Thermoset Epoxy Nanocomposite Coatings

Abstract

The enhancement of both thermal and mechanical properties of epoxy materials using nanomaterials becomes a target in coating of the steel to protect it from aggressive environmental conditions for a long time, with reducing the cost. In this respect, the adhesion properties of the epoxy with the steel surfaces, and its proper superhyrophobicity to repel the seawater humidity, can be optimized via addition of green nanoparticles (NPs). In-situ modification of silver (Ag) and calcium carbonate (CaCO3) NPs with oleic acid (OA) was carried out during the formation of Ag−OA and CaCO3−OA, respectively. The epoxide oleic acid (EOA) was also used as capping for Ca−O3 NPs by in-situ method and epoxidation of Ag−OA NPs, too. The morphology, thermal stability, and the diameters of NPs, as well as their dispersion in organic solvent, were investigated. The effects of the prepared NPs on the exothermic curing of the epoxy resins in the presence of polyamines, flexibility or rigidity of epoxy coatings, wettability, and coatings durability in aggressive seawater environment were studied. The obtained results confirmed that the proper superhyrophobicity, coating adhesion, and thermal stability of the epoxy were improved after exposure to salt spray fog for 2000 h at 36 °C.

Carbon Nanotube Coatings’ Role in Transparency, Mechanical Hardness, and Wetting Angle Increase

“…Indeed, it should be remarked that other approaches can be applied to form novel coatings in order to protect materials from corrosion, bacterial activity, and solvent impact, etc. Experiments and mathematical models have been shown in recently published papers [34][35][36][37][38][39][40][41][42][43] and have demonstrated their various advantages. However, the LOD technique has certain unique advantage that allows treatment of all types of the materials, such as inorganic crystals, semiconductors, metals, and some high-temperature polyimide structures, etc.…”

Refractive Properties of Conjugated Organic Materials Doped with Fullerenes and Other Carbon-Based Nano-Objects

“…Furthermore, absorption and adhesion properties, as well as the hydrophobicity, etc. features should be taken into account [88]. Formation of the novel direction to study the structured materials used in the optoelectronics devices are important as well [89].…”

The Antifouling and Drag-Reduction Performance of Alumina Reinforced Polydimethylsiloxane Coatings Containing Phenylmethylsilicone Oil

“…In the alumina reinforced PSO/PDMS coat- In Figure 11, under the condition of 800-1400 rpm, the increase of alumina content and the decrease of particle size will decrease the drag reduction performance of the coatings. Some studies have shown that flexible materials have an obvious drag reduction effect, because the elastic modulus of the material is low, which can release friction resistance through surface deformation [34,35]. In the alumina reinforced PSO/PDMS coatings, the addition of alumina will increase the elastic modulus of the coatings, thus reducing the buffering effect of the coatings.…”