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New Polymer Syntheses Part 60: A Facile Synthetic Route to Polyamides Based on Thieno[2,3-b]thiophene and Their Corrosion Inhibition Behavior

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Abstract

Polyamides containing thieno[2,3-b]thiophene moiety were prepared via a simple polycondensation reaction of the diaminothieno[2,3-b]thiophene monomer 1a with different kinds of diacid chlorides (including oxalyl, adipoyl, sebacoyl, isophthaloyl, terephthaloyl, 4,4′-azodibenzoyl, 3,3′-azodibenzoyl, p-phenylene diacryloyl) in the presence of LiCl and NMP as a solvent through lowtemperature solution polycondensation. The chemical structures of model compound and synthesized polyamides were confirmed by FTIR, nuclear magnetic resonance spectroscopy (including 1H-NMR and 13C-NMR) and elemental analysis. In addition, the thermal stability, crystallinity structure and surface morphology of synthesized polyamides were characterized via thermogravametric analysis (TGA), wide-angle X-ray diffraction analysis (WAXD) and scanning electron microscopy (SEM). Also, the corrosion inhibition behavior of selected examples of polyamides was investigated; the inhibitive effect of the investigated polymers for carbon steel in 1.0 mol·L−1 HCl was studied using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) methods. PDP results displayed that the polyamides containing thieno[2,3-b]thiophene moiety can be as mixed-type inhibitors. The inhibition efficiency (P, %) was found to be in the range from 67.13% to 96.01%. There is an increase in P by the synthesized polymers in comparison to the starting monomer. The adsorption of these polymers was found to obey Langmuir adsorption isotherm.

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Authors and Affiliations

  1. Polymer Research Lab, Chemistry Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt

    Kamal I. Aly & Mohamed Gamal Mohamed

  2. Chemistry Department, Faculty of Science, Sohag University, Sohag, 82524, Egypt

    Amr H. Moustafa

  3. Chemistry Department, Faculty of Science, Minia University, El-Minia, 61519, Egypt

    Essam K. Ahmed & Sahar M. Mohamed

  4. Chemistry Department, College of Science, King Faisal university, Al Hufuf, 31982, Al Hassa, Saudi Arabia

    Hany M. Abd El-lateef

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  1. Kamal I. Aly
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  2. Amr H. Moustafa
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  3. Essam K. Ahmed
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  4. Hany M. Abd El-lateef
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  5. Mohamed Gamal Mohamed
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  6. Sahar M. Mohamed
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Correspondence to Amr H. Moustafa.

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New Polymer Syntheses Part 60*: A facile Synthetic Route to Polyamides-based on Thieno[2,3-b]thiophene and Their Corrosion Inhibition Behavior

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Aly, K.I., Moustafa, A.H., Ahmed, E.K. et al. New Polymer Syntheses Part 60: A Facile Synthetic Route to Polyamides Based on Thieno[2,3-b]thiophene and Their Corrosion Inhibition Behavior. Chin J Polym Sci 36, 835–847 (2018). https://doi.org/10.1007/s10118-018-2101-3

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