Abstract
Abstract The effects of isothermal crystallization temperature/time on mechanical properties of bio-based polyester poly(ethylene 2,5-furandicarboxylate) (PEF) were investigated. The intrinsic viscosity, crystallization properties, thermal properties, and microstructure of PEF were characterized using ubbelohde viscometer, X-ray diffraction, polarizing optical microscope, differential scanning calorimetry, and scanning electron microscopy. The PEF sample isothermal crystallized at various temperatures for various times was denoted as PEF-T-t. The results showed that the isothermal crystallization temperature affected the mechanical properties of PEF-T-30 by simultaneously affecting its crystallization properties and intrinsic viscosity. The isothermal crystallization time only affected the crystallization properties of PEF-110-t. The crystallinity of PEF-110-40 was 17.1%. With small crystal size, poor regularity, and α′-crystal, PEF-110-40 can absorb the energy generated in the tensile process to the maximum extent. Therefore, the best mechanical properties can be obtained for PEF-110-40 with the tensile strength of 43.55 MPa, the tensile modulus of 1,296 MPa, and the elongation at a break of 13.36%.
Highlights
The effects of isothermal crystallization temperature/time on mechanical properties of bio-based polyester poly(ethylene 2,5-furandicarboxylate) (PEF) were investigated
The crystallinity of PEF-110-30 is 14.1% with small crystal size, poor regularity, mainly α′-crystal, which can absorb the energy generated in the tensile process to the maximum extent, so it gets the best mechanical properties
PEF was prepared via the direct esterification method, and the effects of isothermal crystallization temperature and time on the properties of PEF were investigated
Summary
Abstract: The effects of isothermal crystallization temperature/time on mechanical properties of bio-based polyester poly(ethylene 2,5-furandicarboxylate) (PEF) were investigated. The results showed that the isothermal crystallization temperature affected the mechanical properties of PEF-T-30 by simultaneously affecting its crystallization properties and intrinsic viscosity. Knoop et al [9] prepared high molecular weight furan dicarboxylic acid-based polyester via melt polymerization followed by solid-state polycondensation and studied the crystallization properties of high molecular weight PEF. Wu et al [12] prepared PEF via transesterification polycondensation using organic nonmetal 1,8-diazabicylo[5.4.0]undec-7-ene (DBU) as a catalyst and studied its isothermal crystallization and nonisothermal crystallization kinetics. The relationship between crystallization temperature/time and crystallization behavior of PEF, such as crystallization rate, crystal form, crystal morphology, and crystallinity, as well as the relationship between crystallization behavior and mechanical properties was investigated. The results can provide a method and theoretical reference for the modification and postprocessing of PEF
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