Synthesis, thermal and mechanical properties of fully biobased poly (butylene-co-propylene 2,5-furandicarboxylate) copolyesters with low contents of propylene 2,5-furandicarboxylate units

摘要

To modify the physical properties and promote the practical application of biobased poly(butylene 2,5-furandicarboxylate) (PBF), fully biobased poly(butylene-co-propylene 2,5-furandicarboxylate) (PBPF) copolyesters with low contents (6 and 10 mol%) of propylene 2,5-furandicarboxylate (PF) units were synthesized from 2,5-dimethylfuran dicarboxylate, 1,4-butanediol and 1,3-propanediol via a transesterification and polycondensation reaction. The compositions, intrinsic viscosities, thermal stability, basic thermal parameters, crystal structures, and tensile mechanical properties of PBF and PBPF copolyesters were investigated in detail and compared with each other. Compared with those of PBF, PBPF copolyesters not only displayed high thermal decomposition temperatures (about 370 degrees C), slightly increased glass transition temperatures (about 40 degrees C), and still relatively high melting points (above 150 degrees C) but also exhibited the same crystal structures. The incorporation of a small amount of PF units significantly improved the tensile mechanical properties of PBPF copolyesters.