Bio-based polybenzoxazines as an efficient coatings to protect mild steel surfaces from corrosion

Sharanya, R and Hariharan, A and BalajI, K and Alagar, M (2022) Bio-based polybenzoxazines as an efficient coatings to protect mild steel surfaces from corrosion. High Performance Polymers, 34 (5). pp. 593-603. ISSN 0954-0083

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Abstract

New types of mono and bi-functional benzoxazine monomers were synthesized using cardanol (C) and 4-aminobenzonitrile (abn), p-phenylediamine ( ppda) along with paraformaldehyde. The synthesized benzoxazine monomers structure was elucidated by 1H, 13C-NMR and FTIR spectroscopic techniques. The polymerization temperature (T p ) of C-abn and C- ppda are noticed at 280 o C and 237 o C, respectively. It was also noticed that bi-functional benzoxazine (C- ppda) possesses lower curing temperature than mono-functional benzoxazine (C-abn). The ring opening polymerization of benzoxazine was confirmed by FTIR spectroscopy. Thermal analyses indicate that, benzoxazine [poly(C- ppda)] possesses higher thermal stability than poly(C-abn). The surface roughness of the benzoxazine coated MS specimen was analysed by atomic force microscope. The values of water contact angles obtained for poly(C-abn) and poly(C- ppda) are 145 o and 148 o, respectively. It was noticed that the mild steel specimen coated with bio-based benzoxazine C-abn exhibit excellent resistance to corrosion.

Item Type: Article
Uncontrolled Keywords: Bio-benzoxazine; cardanol; hydrophobicity; thermal stability; Acetal resins; Cationic polymerization; Corrosion resistance; Corrosion resistant coatings; Fourier transform infrared spectroscopy; Low carbon steel; Monomers; Ring opening polymerization; Steel corrosion; Surface roughness; Thermodynamic stability; Benzoxazine; Benzoxazine monomers; Bi-functional; Bio-based; Bio-benzoxazine; Cardanols; Mild-steel surfaces; Polybenzoxazine; Surface from; Synthesised
Subjects: G Chemistry > Absorption
G Chemistry > Biogas
Divisions: Chemistry
Depositing User: Users 5 not found.
Date Deposited: 15 May 2024 09:39
Last Modified: 30 Aug 2024 08:25
URI: https://ir.psgitech.ac.in/id/eprint/591

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