Poly(ethylene 2,5-furandicarboxylate) (PEF) is a biobased polyester with superior thermo-mechanical and gas barrier properties than poly(ethylene terephthalate) (PET), the most widely used petroleum-based polyester. However, PEF is more brittle than PET. To toughen PEF, a series of P(EF-mb-PTMG) (PETF) multiblock copolymers with high intrinsic viscosity were successfully synthesized via melt polycondensation in the presence of poly(tetramethylene glycol) (PTMG) oligomer diols, and characterized with FTIR, ¹H NMR, DSC, WAXD, TGA and SEM, and assessed with tensile and impact testing. The presence of PTMG contributes to promote intrinsic viscosity growth and depress etherification and discoloration side reactions. The PTMG flexible segments show chain length dependent partial miscibility with PEF hard segments, and its presence also plasticizes and promotes cold crystallization of PEF segments. With tuning the PTMG content, high performance PEF-based materials can be tailor-made from high tough thermoplastics with excellent ductility and impact toughness to thermoplastic elastomers with high strength. Particularly, PET^1KF-20 shows excellent ductility (elongation at break 252%) while retaining high modulus (3.0 GPa) and yielding strength (74 MPa), and PET^1KF-35 is the first PEF-based material with impact strength over 50 kJ/m² to date.

聚（2,5-呋喃二甲酸乙烯酯）（PEF）是一种生物基聚酯，具有比最广泛使用的石油基聚酯聚对苯二甲酸乙二醇酯（PET）更好的热机械和气体阻隔性能。但是，PEF比PET更脆。为了增韧PEF，在聚四亚甲基二醇（PTMG）低聚物二醇的存在下，通过熔融缩聚成功合成了一系列具有高特性粘度的P（EF-mb-PTMG）（PETF）多嵌段共聚物，并用FTIR进行了表征，^1个1 H NMR，DSC，WAXD，TGA和SEM，并通过拉伸和冲击测试进行评估。PTMG的存在有助于促进特性粘度的增长，并抑制醚化和变色副反应。PTMG柔性链段显示与PEF硬链段的链长相关的部分混溶性，并且它的存在还可以塑化并促进PEF链段的冷结晶。通过调整PTMG的含量，高性能PEF基材料可以由具有出色延展性和冲击韧性的高韧性热塑性塑料量身定制，以具有高强度的热塑性弹性体。尤其是，PET ^1K F-20在保持高模量（3.0 GPa）和屈服强度（74 MPa）的同时，还具有出色的延展性（断裂伸长率252％），而PET ^1K迄今为止，F-35是第一种基于PEF的材料，其冲击强度超过50 kJ / m ²。