Synthesis and Characterization of Novel Polyamide-ethers Based on Bis-imidazole Containing Bulky Aryl Pendant Groups

Abstract

A series of novel polyamide-ethers (PAEs) based on bis-imidazole containing bulky aryl pendant groups was prepared by direct polycondensation of a diamine, 4-(1-(4-(4-(2-(4-aminophenyl)-4,5-diphenyl-1H-imidazol-1-yl)phenoxy)phenyl)-4,5-diphenyl-1H-imidazol-2-yl)benzenamine (DABI), and various dicarboxylic acids. All the resulting polyamide-ethers were amorphous with inherent viscosities ranged from 0.52 to 0.61 dL/g and were readily soluble in many organic solvents which could be solution-cast into transparent and tough films. The glass transition temperatures (T g ) of these polymers were affected considerably by their chemical structure and ranged from 230 to 310 °C. They had useful levels of thermal stability associated with relatively high temperatures of 10% weight loss (T 10 ) in the range of 329-399 °C in air atmosphere.