Synergistic Effects of Linseed Oil Based Waterborne Alkyd and 3‑Isocynatopropyl Triethoxysilane: Highly Transparent, Mechanically Robust, Thermally Stable, Hydrophobic, Anticorrosive Coatings

• Published in: ACS sustainable chemistry & engineering Vol. 4; no. 6; pp. 3062 - 3075
• Main Authors: Pathan, Shabnam, Ahmad, Sharif
• Format: Journal Article
• Language: English
• Published: American Chemical Society 06-06-2016
• Subjects: Green chemistry; Nanocomposite coatings; Hybrid polymer; Sustainable; Waterborne; Electrochemical impedance spectroscopy
• ISSN: 2168-0485; 2168-0485
• DOI: 10.1021/acssuschemeng.6b00024

High-performance vegetable oil based organic–inorganic bio hybrid materials are of great interest in the current scenario, as the utilization of vegetable oil meets the seventh principle out of the 12 Principles of Green Chemistry that contributes to sustainability in chemistry due to their universal availability, inherent biodegradability, low price, and superb environmental credentials. Here, we report the synthesis of transparent organic–inorganic bio hybrid coatings by tailoring the properties of both linseed oil and 3 isocynatopropyl triethoxysilane (IPTES) using the sol–gel technique. Such materials combine the advantages of both the phases that are usually not compatible within the same material (robustness and homogeneity, mechanical strength, flexibility, optical transparency, hydrophobicity, and anticorrosive properties). The structure elucidation, particle size, and morphology of the synthesized OIH polymers were done by FT-IR, 1H NMR, 13C NMR, 29Si NMR, and electron microscopy techniques (TEM and SEM with EDAX). Thermal properties were characterized by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) techniques. The corrosion resistance behavior of hybrid coatings applied on carbon steel (CS) was evaluated using different electrochemical techniques in 3.5 wt % HCl and NaOH medium. The synthesized hybrid sol–gel material exhibited high transparency in the visible range along with good mechanical, thermal, hydrophobicity, and anticorrosive properties. The results suggest that the biobased hybrid nanocomposite coatings have a great potential to replace the petro-based polymeric coatings for industrial applications.