Ionic Liquids as Novel Reaction Media for the Synthesis of Copoly(ester-amide)s Containing 9,10-Anthraquinone Moiety

Abstract

The use of ionic liquids as novel solvents for the synthesis of aromatic copoly(ester-amide)s, containing a 9,10-anthraquinone moiety in the main chain, from the polycondensation reaction of terephthaloyl chloride and various ratios of p-phenylenediamine and 1,4-dihydroxyanthraquinone is reported. 1,3-Dialkylimidazolium-based ionic liquids are suitable reaction media for the synthesis of copoly(ester-amide)s. These copolymers exhibit color characteristics and thermal stability. The presence of the amide groups in the backbone of these polymers enhances their thermal stabilities. Inherent viscosities of the polymers obtained in 1,3-dialkylimidazolium bromide range from 0.28 to 0.42 dL/g.

Keywords:

• Copoly(ester-amide)s
• 1,4-dihydroxyanthraquinone
• dyes
• ionic liquid
• polycondensation
• terephthaloyl chloride

Notes

^a Monomer = 1.0 mmol; reaction temperature = 120°C; reaction time = 2 h.

^b Measured at a concentration of 0.5 g/dl in NMP containing 2 wt.% LiCl at 25°C.

^a Monomer = 1.0 mmol; reaction temperature = 120°C; reaction time = 2 h.

^b Measured at a concentration of 0.5 g/dl in NMP containing 2 wt.% LiCl at 25°C.

^a Measured at a concentration of 0.5 g/dl in NMP containing 2 wt.% LiCl at 25°C.

^b Monomer = 1.0 mmol; reaction temperature = 120°C; reaction time = 2 h.

^a Decomposition temperature was recorded by TGA at a heating rate of 10 (°C) /min.

^b Residual wt.% at 600°C in argon.