Synthesis and Multifunctional Properties of Allyl‐Substituted Benzoxazines: Anti‐Corrosion, Anti‐Microbial and Computational Insights

ABSTRACT The current work focuses on the synthesis of allyl substituted benzoxazines. The high impact of allyl functionality on benzoxazines has attracted various applications. Five different types of benzoxazines were synthesized using 2‐allylphenol and different amines, and the structures are confirmed using HRMS, ATR‐FTIR, 1 H‐NMR and 13 C‐NMR spectral techniques. The thermal properties of the benzoxazines were analyzed using DSC and TGA. The lowest curing temperature of 207°C was shown by Ap‐ffa than the rest of the monomers. Poly(Ap‐dpm) exhibits the highest char yield of 58% with increasing LOI and HRI values, which describes its high thermal stability. The antimicrobial activity of Ap‐am possesses a 14 mm inhibition zone, revealing its high bacteriostatic property among the other monomers. Furthermore, the corrosion resistance property of poly(Ap‐an) and poly(Ap‐adm) possesses 99.99% efficiency and acts as a good corrosion inhibitor. The experimentally obtained corrosion values are compared theoretically using DFT. Through hydrophobic studies, poly(Ap‐an) possesses the lowest water interface angle and was selected and functionalized with Si69, a coupling agent, to enhance its hydrophobicity on cotton fabric coating. Diverse studies of allyl terminated benzoxazines prove the potential candidate for anti‐corrosion and anti‐microbial coatings for their high performance applications.