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High molecular weight aliphatic polyesters weresynthesized from biobased 1,5-pentanediol and aliphatic diacidswith 4, 5, 6, 9, 10, or 12 carbon atoms via meltpolycondensation. The poly(1,5-pentylene dicarboxylate)swere characterized with intrinsic viscosity, gel permeationchromatography (GPC), nuclear magnetic resonance (NMR),differential scanning calorimetry (DSC), wide-angle X-raydiffraction (WAXD), thermogravimetric analysis (TGA), andtensile testing. The effects of dicarboxylate chain length oncrystalline structure and thermo-mechanical properties wereinvestigated. All the polyesters had weight-average molecularweight over 100,000 g/mol or intrinsic viscosity over 1.05 dL/gexcept poly(1,5-pentylene adipate) (PPeA), which was lessthermally stable than others. As semicrystalline polymers, they have a polyethylene-like crystal structure and crystallize rapidlyexcept poly(1,5-pentylene succinate) (PPeS). As a whole, the crystallizability and melting temperature (Tm) increase withdicarboxylate chain length, and the “even?odd” effect exists to a certain extent. Among them, poly(1,5-pentylene azelate)(PPeAz), poly(1,5-pentylene sebacate) (PPeSe), and poly(1,5-pentylene dodecanedioate) (PPeDo) have Tm of 50?62 °C, goodthermal stability, and exhibit comparable or even superior tensile properties in comparison with polyethylene and the well-knownbiodegradable copolyester, poly(butylene adipate-co-terephthalate) (PBAT). These biobased and potentially biodegradablepolyesters appear to be promising materials for practical applications. |
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