Issue 27, 2021, Issue in Progress

Sustainable aromatic polyesters with 1,5-disubstituted indole units


This work aims to unravel the impact of disubstitution patterns on the physical properties and processing characteristics of indole-based aromatic polyesters. A series of hydroxyl-carboxylate (AB-type) monomers with 1,5-disubstituted indole and 3–6 methylene units was conveniently synthesized and used in bulk polycondensation to yield the corresponding polyesters with decent molecular weight. These new monomers and polyesters showed enhanced thermal stability compared to the previously reported monomers and polyesters with a 1,3-disubstituted indole structure. According to DSC results, these polyesters showed tunable glass transition temperatures (Tg ∼57–80 °C), depending on the length of the aliphatic methylene units. DSC and WAXD measurements revealed that these polymers did not crystalize from melt, but the ones with 3 or 5 methylene units per repeating unit crystalized from solution. Finally, we demonstrated that the new polyesters with 1,5-disubstituted indole units could be crosslinked using sustainable aromatic aldehyde, which could further enhance their thermal properties.

Graphical abstract: Sustainable aromatic polyesters with 1,5-disubstituted indole units

Supplementary files

Article information

Article type
19 Mar 2021
26 Apr 2021
First published
05 May 2021
This article is Open Access
Creative Commons BY license

RSC Adv., 2021,11, 16480-16489

Sustainable aromatic polyesters with 1,5-disubstituted indole units

P. Wang and B. Zhang, RSC Adv., 2021, 11, 16480 DOI: 10.1039/D1RA02197D

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