New polymer syntheses, Part 44: Synthesis, characterization, and corrosion inhibition behavior of new polyurea derivatives based on diaryl ether in the polymers backbone

Abstract

A new interesting class of polyurea derivatives 5 a-c was synthesized using solution polycondensation technique by the interaction of 1 mol of 4,4 0 -bis(2 00 -aminothiazol-4 00 -yl)diphenyl ether monomer 3 with 1 mol of diisocyanate compounds in pyridine. The model compound 4 was synthesized by the interaction of 1 mol of monomers 3 with 2 mol of phenylisocyanate in pyridine, and the structure was confirmed by correct elemental and spectral analyses. The resulting polymers were characterized by elemental and spectral analyses besides solubility and viscometry measurements. The thermal properties of those polymers were evaluated by TGA, DTG, and DTA measurements and correlated to their structural units. In addition, the morphological properties of a selected example were tested by SEM, and the electrical properties of these polymers were measured. On the other hand, the corrosion inhibition properties of selected example of polyurea derivatives were carried out on steel in 0.5M H 2 SO 4 at 40 C giving cathodic inhibition.

New Polymer Syntheses Part 56: Novel Friedel-Crafts Polyketones Containing Naphthalene Moiety: Synthesis, Characterization and Antimicrobial Activity

“…On the other hand, some of the polymers are partially soluble in n-hexane, benzene and chloroform, while the majority are partially or completely soluble in acetonitrile except polymers 2 c,d which are completely insoluble in the same solvent. Furthermore, polymers based on flexible polymethylene spacers (CH 2 ) 4 and (CH 2 ) 8 have slightly more solubility than other polymers containing aromatic moieties, like the same observation in analogues polymers described in our previous work (36,37). The results presented in Table 2 are clearly indicate that Friedel-Crafts polyketones based cyclohexanone moiety in the polymers backbone have slightly more solubility than Friedel-Crafts polyketones based cyclopentanone moiety, which appeared clearly in most of tested solvents.…”

Surface selectivity competition of newly synthesized polyarylidene(keto amine) polymers toward different metal ions

“…This observation was also more pronounced for the shorter aliphatic methylene spacers [(CH 2 ) 2 ] and appeared clearly in both the n ‐hexane and acetonitrile solvents. The resulting PAKA hybrid polymers acting as analogue polymers were described in our previous study . The higher flexibility of the cyclohexanone moiety gave better solubility for most of the polymers in most of the tested solvents compared to the other moieties described elsewhere .…”

New heteroaromatic polyazomethines containing naphthyridine moieties: Synthesis, characterization, and biological screening

“…The initial decomposition temperature (IDT)59 corresponded to the temperature at which the initial degradation could occur. The IDTs of all of the prepared polymers appeared at the temperatures for 10% weight loss percentages ( T 10 ), which was considered at the same time the polymers decomposition temperatures;60, 61 it occurred in the range 212–330°C. Therefore, the data in Table II indicate that the thermal stabilities of polyazomethines 7 a –7 c and 7 e (at 10%) were in the order: 7 b > 7 a and 7 c > 7 e .…”