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Poly(butylene 2,5-furandicarboxylate) (PBF) constitutes a new engineering polyester produced from renewable resources, as it is synthesized from 2,5-furandicarboxylic acid (2,5-FDCA) and 1,4-butanediol (1,4-BD), both formed from sugars coming from biomass. In this research, initially high-molecular-weight PBF was synthesized by applying the melt polycondensation method and using the dimethylester of FDCA as the monomer. Furthermore, five different series of PBF blends were prepared, namely poly(l-lactic acid)-poly(butylene 2,5-furandicarboxylate) (PLA-PBF), poly(ethylene terephthalate)-poly(butylene 2,5-furandicarboxylate) (PET-PBF), poly(propylene terephthalate)-poly(butylene 2,5-furandicarboxylate) (PPT-PBF), poly(butylene 2,6-naphthalenedicarboxylate)-poly(butylene 2,5-furandicarboxylate) (PBN-PBF), and polycarbonate-poly(butylene 2,5-furandicarboxylate) (PC-PBF), by dissolving the polyesters in a trifluoroacetic acid/chloroform mixture (1/4 v / v ) followed by coprecipitation as a result of adding the solutions into excess of cold methanol. The wide-angle X-ray diffraction (WAXD) patterns of the as-prepared blends showed that mixtures of crystals of the blend components were formed, except for PC which did not crystallize. In general, a lower degree of crystallinity was observed at intermediate compositions. The differential scanning calorimetry (DSC) heating scans for the melt-quenched samples proved homogeneity in the case of PET-PBF blends. In the remaining cases, the blend components showed distinct T g s. In PPT-PBF blends, there was a shift of the T g s to intermediate values, showing some partial miscibility. Reactive blending proved to improve compatibility of the PBN-PBF blends.

Biobased Engineering Thermoplastics: Poly(butylene 2,5-furandicarboxylate) Blends