Synthesis, Characterization and Corrosion Inhibitive Properties of New Thiazole Based Polyamides Containing Diarylidenecyclohexanone Moiety

• Published in: Chinese journal of polymer science Vol. 33; no. 1; pp. 1 - 13
• Main Authors: Aly, K. I., Hussein, M. A.
• Format: Journal Article
• Language: English
• Published: Heidelberg Chinese Chemical Society and Institute of Chemistry, CAS 01.01.2015
• Subjects: Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Chlorides; Condensed Matter Physics; Corrosion; Corrosion inhibitors; Dichlorides; Industrial Chemistry/Chemical Engineering; Mathematical models; Monomers; Polyamide resins; Polymer Sciences; Thermal properties; X射线衍射分析; 低温溶液缩聚; 合成聚合物; 噻唑基; 抑制作用; 结构单元; 耐蚀性能; 聚酰胺; Characterization; Corrosion inhibitive properties; Synthesis; Diarylidenecyclohexanone; Thiazole; Polyamides
• ISSN: 0256-7679; 1439-6203
• DOI: 10.1007/s10118-015-1569-3

The present work aimed to synthesize a new interesting series of thiazole based polyamides containing diarylidenecyclohexanone moiety 5a-5f using low temperature solution polycondensation technique. The new polymers were synthesized by the reaction of thiazole based monomer namely, bis（2-aminothiazol-4-ylbenzylidene）cyclohexanone 3 with different aliphatic and aromatic diacid chlorides using NMP, and in the presence of anhydrous Li Cl as catalyst. Adipoyl, sebacoyl, oxaloyl, terephthaloyl, isophthaloyl dichlorides and biphenyl dicarbonyl dichloride were used as diacid chlorides. The structure of the model compound 4 as well as the new polymers was confirmed by correct elemental and spectral analyses. The thermal properties of those polymers were evaluated by TGA and DTG measurements and correlated to their structural units, beside X-ray diffraction analysis, solubility and viscometry measurements. The inherent viscosities for the synthesized polymers were in the range 0.6–1.03 d L/g. On the other hand the corrosion inhibitive properties of monomer 3 as well as polyamides 5d and 5f as selected examples were carried out on carbon-steel in 0.5 mol/L H2SO4 at 40 °C. The calculated inhibition efficiency（IE%） for polymer 5d was in the range（82 ± 6）% in all selected concentrations. The best value of IE% was obtained at 1 mg/L to reach 98.24% for polymer 5d and at 0.5 mg/L to reach 87.75% for polymer 5f.