Citation: Kamal I. Aly, Amr H. Moustafa, Essam K. Ahmed, Hany M. Abd El-lateef, Mohamed Gamal Mohamed, Sahar M. Mohamed. New Polymer Syntheses Part 60: A Facile Synthetic Route to Polyamides Based on Thieno[2,3-b]thiophene and Their Corrosion Inhibition Behavior[J]. Chinese Journal of Polymer Science, ;2018, 36(7): 835-847. doi: 10.1007/s10118-018-2101-3 shu

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

a.
Polymer Research Lab, Chemistry Department, Faculty of Science, Assiut University, Assiut 71516, Egypt
b.
Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt
c.
Chemistry Department, Faculty of Science, Minia University, El-Minia 61519, Egypt
d.
Chemistry Department, College of Science, King Faisal university, Al Hufuf, 31982 Al Hassa, Saudi Arabia

Corresponding author: Amr H. Moustafa, amr_hassanegypt@ymail.com
Received Date: 17 September 2017
Accepted Date: 9 December 2017
Available Online: 25 April 2018

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