Synthesis of Novel Eugenol‐Containing Polysilsesquioxanes with a Flexible Spacer and Their Use for Functional Anticorrosive Coatings

Abstract The destruction of various structural materials and products in aggressive atmospheric conditions demands for the development of more resistant and improved oligomers and polymers for adhesive coatings with barrier properties, which could prevent corrosion and rapid aging of metals and polymers. In this article, we demonstrate the synthesis of novel polysilsesquioxane containing a covalently bonded eugenol, being a corrosion inhibitor of natural origin. The research demonstrates the synthesis of a monomer from eugenol and MPTMS by the UV‐initiated thiol‐ene reaction. Polysilsesquioxanes were synthesized by hydrolytic and acidohydrolytic polycondensation methods. The 29 Si NMR spectroscopy shows the difference in the chemical structures of the obtained products. The synthesized polysilsesquioxanes have a glass transition temperature of −6.5 °C and −7.2 °C for hydrolytic and acidohydrolytic polycondensation, respectively. At the same time, rheokinetics shows a significant difference in the curing of polysilsesquioxanes obtained by two different methods in the temperature range of 150–190 °C. So, it was shown that the product obtained by acidohydrolytic polycondensation exhibited much lower ability for the formation of cross‐linked networks. The product, obtained by hydrolytic polycondensation, exhibited good coating performance, and the obtained coatings showed high anticorrosive efficiency.