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<p>The methionine-based zwitterionic monomer [(H<sub>2</sub>C = CH-CH<sub>2</sub>)<sub>2</sub>NH<sup>+</sup>CH(CO<sub>2</sub><sup>−</sup>)CH<sub>2</sub>CH<sub>2</sub>SMe] (<b>I</b>) has been cyclopolymerized to yield polyzwitterion (<b>II</b>), whereas its copolymerization with the glycine-based monomer [(H<sub>2</sub>C = CH-CH<sub>2</sub>)<sub>2</sub>NH<sup>+</sup>CH<sub>2</sub>CO<sub>2</sub><sup>−</sup>] (<b>III</b>) and aspartic acid-based monomer [(H<sub>2</sub>C = CH-CH<sub>2</sub>)<sub>2</sub>NH<sup>+</sup>CH(CO<sub>2</sub><sup>−</sup>)CH<sub>2</sub>CO<sub>2</sub>H] (<b>IV</b>) afforded respective random copolymers (<b>V</b>) and (<b>VI</b>). Polyzwitterions (<b>II</b>), (<b>V</b>), and (<b>VI</b>) have been characterized via water-solubility, viscometry, thermogravimetric analysis (TGA), FTIR, and NMR spectroscopy. The polymers were investigated for their ability to mitigate of carbon-steel corrosion in 15% HCl at 30–60&#xa0;°C. The polymers outperformed monomer <b>I</b> owing to their larger surface area and increased number of adsorption sites. At 2 ppm, <b>VI</b> yielded an inhibition efficiency (IE) of 85.2% at 30&#xa0;°C. The corrosion process followed the Langmuir isotherm model with a Δ<i>G</i><sub>ads</sub> of -50.4&#xa0;kJ mol<sup>− 1</sup>. At the 5 ppm concentration, the IE% of <b>VI</b> improved from 87.1 to 98.1 at 30&#xa0;°C in the presence of KI (400 ppm). The addition of KI led to cooperative coadsorption with synergistic parameter values of 4.47 and 3.89 at 30 and 60&#xa0;°C, respectively. The remarkable inhibition efficacy of low concentrations of the inhibitor paves the way for its application in oil-well stimulation.</p> Graphical abstract <p></p>

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Cyclopolymers of amino acid-based zwitterionic monomers: N,N-diallyl-methionine, -glycine, and -aspartic acid. Synthesis and application as corrosion inhibitors

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Sabri S. E. Abdelkreem,
  • Shaikh A. Ali

摘要

The methionine-based zwitterionic monomer [(H2C = CH-CH2)2NH+CH(CO2−)CH2CH2SMe] (I) has been cyclopolymerized to yield polyzwitterion (II), whereas its copolymerization with the glycine-based monomer [(H2C = CH-CH2)2NH+CH2CO2−] (III) and aspartic acid-based monomer [(H2C = CH-CH2)2NH+CH(CO2−)CH2CO2H] (IV) afforded respective random copolymers (V) and (VI). Polyzwitterions (II), (V), and (VI) have been characterized via water-solubility, viscometry, thermogravimetric analysis (TGA), FTIR, and NMR spectroscopy. The polymers were investigated for their ability to mitigate of carbon-steel corrosion in 15% HCl at 30–60 °C. The polymers outperformed monomer I owing to their larger surface area and increased number of adsorption sites. At 2 ppm, VI yielded an inhibition efficiency (IE) of 85.2% at 30 °C. The corrosion process followed the Langmuir isotherm model with a ΔGads of -50.4 kJ mol− 1. At the 5 ppm concentration, the IE% of VI improved from 87.1 to 98.1 at 30 °C in the presence of KI (400 ppm). The addition of KI led to cooperative coadsorption with synergistic parameter values of 4.47 and 3.89 at 30 and 60 °C, respectively. The remarkable inhibition efficacy of low concentrations of the inhibitor paves the way for its application in oil-well stimulation.

Graphical abstract