Synthesis, characterization, and corrosion inhibition study of homo- and novel copolymers of o-chloroaniline and o-phenylenediamine on a mild steel

Conjugated polymers (CPs) having a backbone of alternating single and multiple bonds are well known for their technological applications. Herein, we report the successful synthesis of CPs; poly( o -chloroaniline) (POCA), poly( o -phenylenediamine) (POPD), and for the first time their copolymer poly(...

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Bibliographic Details
Published in:Colloid and polymer science 2024-02, Vol.302 (2), p.137-149
Main Authors: Ahmad, Shah Masood, Kamran, Muhammad, shah, Anwar ul Haq Ali, Bilal, Salma
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Chloroform
Complex Fluids and Microfluidics
Copolymers
Corrosion
Corrosion tests
Dimethyl sulfoxide
Food Science
Low carbon steels
Nanotechnology and Microengineering
Phenylenediamine
Physical Chemistry
Polymer Sciences
Soft and Granular Matter
Synthesis
Thermal stability
Voltammetry
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Summary:Conjugated polymers (CPs) having a backbone of alternating single and multiple bonds are well known for their technological applications. Herein, we report the successful synthesis of CPs; poly( o -chloroaniline) (POCA), poly( o -phenylenediamine) (POPD), and for the first time their copolymer poly(OPD- co -OCA) along with the evaluation of corrosion inhibition efficiency. The obtained materials were characterized by UV–Visible spectroscopy, FTIR, SEM, XRD, TGA, and cyclic voltammetry measurements. The comparative analysis confirmed the satisfactory formation of homopolymers POCA, POPD and its copolymer poly(OPD- co -OCA). The homopolymer POPD and copolymer poly(OPD- co -OCA) are soluble in common organic solvents (acetone, methanol, N-methyl-2-pyrrolidone (NMP), Dimethyl sulfoxide (DMSO), and chloroform) while homopolymer POCA is insoluble. The novel copolymer poly(OPD- co -OCA) reveals good thermal stability than homopolymers POPD and POCA. The cyclic voltammetry studies show that copolymer poly(OPD- co -OCA) acquired redox behavior having an anodic peak at about 0.4 V, nevertheless corresponding homopolymer POPD act as an insulator with no obvious redox peak. The corrosion inhibition efficiency on a mild steel for copolymer poly(OPD- co -OCA) is found 70 to 80% which is reasonably higher than homopolymer POPD (68%), probably is due to donor–acceptor substituents involved in copolymer. Graphical Abstract
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-023-05180-4