Novel high Tg fully biobased poly(hexamethylene-co-isosorbide-2,5-furan dicarboxylate) copolyesters: Synergistic effect of isosorbide insertion on thermal performance enhancement

Publication date: Available online 25 September 2019Source: Polymer Degradation and StabilityAuthor(s): Nejib Kasmi, Nina Maria Ainali, Elena Agapiou, Lazaros Papadopoulos, George Z. Papageorgiou, Dimitrios N. BikiarisAbstractHere an effective solution for overcoming the low glass transition temperature (Tg) of poly(hexamethylene 2,5-furan dicarboxylate) (PHF), a fully biobased polyester derived from dimethylfuran-2,5-furan-dicarboxylate (DMFD) and 1,6-hexanediol (1,6-HD), is proposed that uses isosorbide (Is) as a bicyclic rigid diol comonomer. Incorporating this sugar-derived diol with a broad scope content (3–90 mol%) into PHF macromolecular chain, by melt polycondensation and using titanium (IV) isopropoxide (TTIP) catalyst, results in the synthesis of highly heat-resistive poly(hexamethylene-co-isosorbide-2,5-furandicarboxylates) copolyesters (PHIsF). The chemical structure and composition of the prepared 100% renewable resources-based materials were confirmed in detail by 1H NMR and FTIR spectroscopies. Random microstructures were obtained for PHIsF samples, when Is content exceeds 40 mol%. As revealed by Wide-Angle X-ray Diffraction (WAXD) patterns, increase of IsF content in the copolymers leads to amorphous materials. The latter exhibited an excellent thermal stability up to 360 °C and very variable Tg values oscillating from 10 to 135 °C depending on the comonomer ratio, in which it gradually increases with increasing of Is feed content. Results found he...

Source: Polymer Degradation and Stability - September 26, 2019 Category: Chemistry Source Type: research