Polyesters from 2,5-furandicarboxylic acid are considered as biobased alternatives to their terephthalate counterparts. This work is focused on polymer blends comprised of furan-based polyesters differing by one or two methylene groups in their repeat units. Blends of Poly(ethylene 2,5-furandicarboxylate) (PEF) and poly(propylene 2,5-furandicarboxylate) (PPF) displayed a single composition-dependent glass temperature (T_g). Dielectric spectroscopy results revealed dynamically homogeneous mixtures when the backbones differ by a single methylene unit and dynamically heterogeneous mixtures when they differ by two methylene units. The most interesting finding was the single segmental dynamics in the PEF-PPF and poly(butylene furanoate)-poly(propylene furanoate) (PBF-PPF) blends. For comparison, homologous terephthalate blends were also investigated. Finally, reactive blending was applied in PEF-PBF blends and enhanced compatibility was achieved even after short times due to transesterification reactions at elevated temperatures. With increasing duration of melt-mixing the thermodynamic miscibility between PEF and PBF increased and ultimately a random copolymer was obtained.

2,5-呋喃二甲酸的聚酯被认为是其对苯二甲酸酯对应物的生物替代品。这项工作的重点是由呋喃基聚酯组成的聚合物共混物，它们的重复单元相差一个或两个亚甲基。聚（2,5-呋喃二甲酸乙烯酯）（PEF）和聚（2,5-呋喃二甲酸丙烯酯）（PPF）的共混物表现出单一的成分依赖性玻璃温度（T _g）。介电谱结果表明，当主链之间相差一个亚甲基单元时，混合物为动态均质混合物；当骨架之间相差两个亚甲基单元时，则为动态异质混合物。最有趣的发现是PEF-PPF和聚（呋喃丁酸丁二醇酯）-聚呋喃酸丙二酯（PBF-PPF）共混物中的单个链段动力学。为了比较，还研究了同源对苯二甲酸酯共混物。最后，将反应性共混物应用于PEF-PBF共混物中，即使在短时间内由于高温下的酯交换反应，也能实现增强的相容性。随着熔体混合时间的延长，PEF和PBF之间的热力学混溶性增加，最终获得了无规共聚物。