“One‐pot” synthesis of aromatic poly(1,3,4‐oxadiazole)s in novel solvents—ionic liquids

Abstract

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

High temperature reaction between poly(glycolic acid) and ε-caprolactone in ionic liquids

“…A number of organic reactions [14][15][16][17][18][19][20] have been investigated in these new solvents, as well as polymerizations, mainly free-radical [21][22][23][24][25][26], electrochemical [27][28], cationic [29] and enzyme-catalyzed [30] polymerizations. However, only a few articles deal with polycondensation reactions in ionic liquids [31][32][33][34][35].…”

Ionic Liquids as Solvents and/or Catalysts in Polymerization

“…Poly(1,3,4-oxadiazole)s (PODs) and phosphonic acid-functionalized PODs were prepared in [PMIM]Br/TPP by direct polycondensation of corresponding dicarboxylic acids and their dihydrazides [106,107] (Fig. 13.7).…”

Synthesis and characterization of thermostable polyamides from unsymmetrical diamines containing flexible ether linkage and different diarylimidazole pendants in ionic liquids

“…Analyzing the application of ILs in polymer synthesis proves their efficiency, so various polycondensation processes were successfully accomplished in ionic medium as well. There have been many reports that the reaction of different diamines with dicarboxylic acids in ILs resulted in the formation of high molecular weight polyamides [6][7][8][9][10]. Imidazoliumbased ILs has been significantly expanded so that today many different candidates are accessible and even commercially available.…”