Synthesis, characterization, and thermal stability of novel wholly para-oriented aromatic poly(ether-amide-hydrazide)s bearing pendant groups and their corresponding poly(ether-amide-1,3,4-oxadiazole)s

• Published in: Polymer bulletin (Berlin, Germany) Germany), 2011-03, Vol.66 (5), p.609-625
• Main Authors: Fahmy, Mona Mohamed, Al-Ghamdi, Refah Farhan, Mohamed, Nadia Ahmed
• Format: Article
• Language: English
• Subjects: Acids; Applied sciences; Aromatic compounds; Carbon; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Chloride; Chlorides; Complex Fluids and Microfluidics; Dimethyl acetamide; Dimethylformamide; Exact sciences and technology; Humidity; Low temperature; Nitrogen; Organic Chemistry; Organic polymers; Original Paper; Oxadiazoles; Physical Chemistry; Physicochemistry of polymers; Polyamide resins; Polycondensation; Polycondensation reactions; Polymer films; Polymer Sciences; Polymerization; Polymers; Preparation, kinetics, thermodynamics, mechanism and catalysts; Salicylic acid; Soft and Granular Matter; Solubility; Solvents; Synthesis; Temperature; Thermal stability; Thermodynamic properties; Viscosity
• ISSN: 0170-0839; 1436-2449
• DOI: 10.1007/s00289-010-0296-8

Four novel wholly para-oriented aromatic poly(ether-amide-hydrazide)s containing various pendant groups on their aromatic rings were synthesized from p-aminosalicylic acid hydrazide (PASH) with an equimolar amount of either 4,4′-(1,4-phenylenedioxy)dibenzoyl chloride (1a), 4,4′-(2,5-tolylenedioxy)dibenzoyl chloride (1b), 4,4′-(2-tert-butyl-1,4-phenylenedioxy)dibenzoyl chloride (1c), or 4,4′-(2,5-biphenylenedioxy)dibenzoyl chloride (1d) via a low temperature solution polycondensation reaction. A polyamide-hydrazide without the ether and pendant groups, poly[4-(terephthaloylamino)salicylic acid hydrazide, PTASH, is also investigated for comparison. It was synthesized from PASH and terephthaloyl chloride by the same synthetic route. The polymer intrinsic viscosities ranged from 4.5 to 2.47 dlg −1 in N,N-dimethyl acetamide (DMAc) at 30 °C and decreased with the introduction of the ether and pendant groups into the polymer. All the polymers were soluble in DMAc, N,N-dimethyl formamide (DMF), and N-methyl-2-pyrrolidone (NMP) and their solutions could be cast into flexible films with good mechanical strengths. Further, they exhibited a great affinity to water sorption. Their solubility and hydrophilicity increased with introduction of the ether and pendant groups into the polymer. The prepared polymers could be thermally cyclodehydrated under nitrogen atmosphere into the corresponding poly(ether-amide-1,3,4-oxadiazole)s approximately in the region of 300–450 °C. The introduction of the flexibilizing ether linkages and the pendant groups into the polymer improves the solubility of the resulting poly(ether-amide-1,3,4-oxadiazole)s compared to poly(amide-1,3,4-oxadiazole) free from these groups.