Green polymeric materials: On the dynamic homogeneity and miscibility of furan-based polyester blends

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-furandicarbox...

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Bibliographic Details
Published in:Polymer (Guilford) 2019-06, Vol.174, p.187-199
Main Authors: Poulopoulou, Niki, Pipertzis, Achilleas, Kasmi, Nejib, Bikiaris, Dimitrios N., Papageorgiou, Dimitrios G., Floudas, George, Papageorgiou, George Z.
Format: Article
Language:English
Subjects:
2,5-furandicarboxylic acid
Blends
High temperature
Homogeneity
Homogeneous mixtures
Homology
Methylene
Miscibility
poly(ethylene furanoate)
Polyester resins
Polyesters
Polymer blends
Propylene
Spectroscopy
Temperature dependence
Terephthalate
Transesterification
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Summary: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 (Tg). 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. [Display omitted] •Polyester blends comprised of furanoate polyesters were prepared.•Their thermodynamic state and local segmental dynamics were investigated.•The blends are dynamically homogeneous when the backbones differ by a single methylene unit.•Reactive blending promotes thermodynamic miscibility of the furanoate-based homopolymers.•After reactive blending, a copolymer was formed, making the blend dynamically homogeneous.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2019.04.058