"One-pot" synthesis of aromatic poly(1,3,4-oxadiazole)s in novel solvents-ionic liquids

• Published in: Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 2006-01, Vol.44 (1), p.380-394
• Main Authors: Lozinskaya, Elena I., Shaplov, Alexander S., Kotseruba, Mariya V., Komarova, Lidiya I., Lyssenko, Konstantin A., Antipin, Mikhail Y., Golovanov, Denis G., Vygodskii, Yakov S.
• Format: Article
• Language: English
• Subjects: 4-oxadiazole)s; condensing agent; direct polycondensation; ionic liquids; poly; poly(1,3,4‐oxadiazole)s; polyhydrazides; triphenyl phosphite
• ISSN: 0887-624X; 1099-0518
• DOI: 10.1002/pola.21141

The new convenient method for the synthesis of high molecular weight aromatic poly(1,3,4‐oxadiazole)s (PODs) has been proposed. These polymers were prepared by “one‐pot” procedure from dicarboxylic acid and hydrazine's salt (sulfate, phosphate) or dicarboxylic acid dihydrazides. The mixture of ionic liquid and triphenyl phosphite was used both as a solvent and condensing agent. The polycyclization occurred at a sufficiently low temperature of 210 °C for 2–5 h and resulted in obtaining film‐forming PODs having inherent viscosities up to 0.9 dL/g and good thermal stability. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 380–394, 2006 The new convenient method for the synthesis of high molecular weight aromatic poly(1,3,4‐oxadiazole)s (PODs) has been proposed. These polymers were prepared by “one–pot” procedure from dicarboxylic acid and hydrazine's salt (sulfate, phosphate) or dicarboxylic acid dihydrazides. The mixture of ionic liquid and triphenyl phosphite was used both as a solvent and condensing agent. The polycyclization occurred at a sufficiently low temperature of 210 °C for 2–5 h and resulted in obtaining film‐forming PODs having inherent viscosities up to 0.9 dL/g and good thermal stability.