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Chinese Journal of Polymer Science

, Volume 36, Issue 7, pp 835–847 | Cite as

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

  • Kamal I. Aly
  • Amr H. Moustafa
  • Essam K. Ahmed
  • Hany M. Abd El-lateef
  • Mohamed Gamal Mohamed
  • Sahar M. Mohamed
Article

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.

Keywords

Thieno[2,3-b]thiophene Polymer synthesis Thermal properties Industrial applications Corrosion inhibition 

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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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Copyright information

© Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Kamal I. Aly
    • 1
  • Amr H. Moustafa
    • 2
  • Essam K. Ahmed
    • 3
  • Hany M. Abd El-lateef
    • 4
  • Mohamed Gamal Mohamed
    • 1
  • Sahar M. Mohamed
    • 3
  1. 1.Polymer Research Lab, Chemistry Department, Faculty of ScienceAssiut UniversityAssiutEgypt
  2. 2.Chemistry Department, Faculty of ScienceSohag UniversitySohagEgypt
  3. 3.Chemistry Department, Faculty of ScienceMinia UniversityEl-MiniaEgypt
  4. 4.Chemistry Department, College of ScienceKing Faisal university, Al HufufAl HassaSaudi Arabia

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