20.500.12556/DKUM-91849 Effect of monomer type on the synthesis and properties of poly(ethylene furanoate) This work aimed to produce bio-based poly(ethylene furanoate) (PEF) with a high molecular weight using 2,5-furan dicarboxylic acid (FDCA) or its derivative dimethyl 2,5-furan dicarboxylate (DMFD), targeting food packaging applications. The effect of monomer type, molar ratios, catalyst, polycondensation time, and temperature on synthesized samples’ intrinsic viscosities and color intensity was evaluated. It was found that FDCA is more effective than DMFD in producing PEF with higher molecular weight. A sum of complementary techniques was employed to study the structure– properties relationships of the prepared PEF samples, both in amorphous and semicrystalline states. The amorphous samples exhibited an increase in glass transition temperature of 82–87 ◦C, and annealed samples displayed a decrease in crystallinity with increasing intrinsic viscosity, as analyzed by differential scanning calorimetry and X-ray diffraction. Dielectric spectroscopy showed moderate local and segmental dynamics and high ionic conductivity for the 2,5-FDCA-based samples. The spherulite size and nuclei density of samples improved with increased melt crystallization and viscosity, respectively. The hydrophilicity and oxygen permeability of the samples were reduced with increased rigidity and molecular weight. The nanoindentation test showed that the hardness and elastic modulus of amorphous and annealed samples is higher at low viscosities due to high intermolecular interactions and degree of crystallinity. bio-based polymers poly(ethylene furanoate) polycondensation thermal properties mechanical properties oxygen transmission rates polimeri na biološki osnovi poli(etilen furanoat) polikondenzacija toplotne lastnosti mehanske lastnosti hitrost prenosa kisika true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/2073-4360/15/12/2707 Članek v reviji 2025-02-13 16:13:09 2025-02-13 16:13:09 2025-02-14 03:12:50 0000-00-00 00:00:00 2023 0 0 26 str. iss. 12 Vol. 15 June 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2023-05-31 2023-06-14 2023-06-16 577:620.3 223114243 10.3390/polym15122707 2073-4360 polymers-15-02707.pdf polymers-15-02707.pdf 1 6A770887C89FB3D717AEB176989F6B44 cc745beddc988f3c2169da015841db7540ec5bb32c802fb75c0b34399422ae30 66c42223-ea1d-11ef-ae38-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=188646 https://www.mdpi.com/2073-4360/15/12/2707 0 6e5d0522-ea1d-11ef-ae38-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=188647 Fakulteta za strojništvo 0 0 0