Abstract
In this article, several novel polyesters containing renewable 2,6-pyridinedicarboxyl aromatic units are synthesized by direct polycondensation. The obtained polyesters are chemically identified by Fourier transform infrared and proton nuclear magnetic resonance. Their average weight molar masses vary with the diol chain length, from M w = 2 600 g·mol−1 to M w = 51 600 g·mol−1. These polyesters exhibit high thermal stability with thermaldegradation temperatures (T max) ranging from 330 to 399 °C. Among them, the polyesters containing bicyclic diols (isosorbide IS and isomannide IM) are amorphous and show glass transition temperatures (T g) up to 163 °C and 176 °C respectively. Besides, polyesters containing linear diols are semi-crystalline with melting temperatures (T m) ranging from 110 to 189 °C. The semi-crystalline nature is verified by X-ray diffraction and polarized optical microscopy. These results disclose that 2,6-pyridinedicarboxylic acid (PDA26) is attractive as a bio-occuring molecule for preparing both high T g and semi-crystalline polymers when finely choosing the diols.
Published Version
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