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Poly(butylene 2,5-furandicarboxylate-co-succinate) copolyesters (coPBFxSy) have been synthesized by\udring opening polymerization (ROP). Cyclic butylene 2,5-furandicarboxylate and butylene succinate\udoligomer mixtures, to be used as monomers for ROP, were prepared by high dilution condensation\udand enzymatic cyclization reactions, respectively. Two different catalytic systems, tin dioctanoate and\udsupported Candida antarctica lipase B (CALB), were used for polymerization. Thus two series of copolyesters\udcovering the whole range of compositions were prepared and their properties comparatively\udexamined. In both cases, random copolyesters with compositions close to those used in their respective\udfeeds were obtained. The influence of composition on reaction kinetics with respect to time and\udtemperature was evaluated for the two series. Chemically catalyzed ROP rendered copolyesters with Mw\udin the ~50 000–65 000 g mol-1 range, whereas values between 15 000 and 45 000 g mol-1 were attained\udwhen the ROP reaction was assisted by CALB. The thermal behavior of coPBFxSy obtained by ROP was\udsimilar to that reported for such copolymers prepared by melt polycondensation. They all start to decompose\udabove 300 °C and display melting enthalpy and temperatures that decrease with copolymerization,\udattaining minimum values when the comonomer contents are approximate to balance. On the\udcontrary, the glass-transition temperature increased almost linearly with the content of butylene furandicarboxylate\udunits, covering the whole range of values between those of the two parent homopolyesters.\udSmall deviations in thermal properties observed between the two series could be attributed to their differences\udin molecular weights. Hydrolytic and enzymatic degradation studies revealed that coPBFxSy\udbecame more degradable with increasing content of succinic units, whereas the homopolyester PBF\udremained practically unaffected when incubated under similar conditions.Peer ReviewedPostprint (author's final draft

Fully bio-based aromatic–aliphatic copolyesters: poly(butylene furandicarboxylate-co-succinate)s obtained by ring opening polymerization