Add time:08/26/2019         Source:sciencedirect.com

1,5-Pentanediol (cas 111-29-5) (PeDO) is a biobased but less studied diol monomer for polyester synthesis. As one of a series of studies on PeDO-derived polyesters, two aliphatic-aromatic copolyesters, poly(pentylene succinate-co-terephthalate) (PPeST) and poly(pentylene adipate-co-terephthalate) (PPeAT), were synthesized through melt copolycondensation of biobased PeDO, SA (or AA) and TPA. The chemical structure was characterized by 1H NMR, and the thermo-mechanical properties were assessed by DSC, WAXD, TGA and tensile test. The 1H NMR results demonstrated random structure and controllable copolymer composition. PPeATs showed two-stage thermal decomposition as the PeA units were clearly less stable than the PeT units at high temperature. In comparison, PPeSTs exhibited better thermal stability which was improved with increasing PeT unit content. Due to the difference in thermal stability, high intrinsic viscosity (0.78–1.4 dL/g) was facilely reached in synthesizing PPeSTs with melt copolycondensation, but medium intrinsic viscosity (0.58–0.66 dL/g) for PPeATs. Both kinds of copolyesters showed isodimorphism behavior and composition-dependent weak crystallizability. The PeT-rich copolyesters like PPeST85 and PPeAT85 showed reasonably good tensile properties because of higher crystallizability and stronger chain interaction.

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