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. 2020 May 26;12(6):1209. doi: 10.3390/polym12061209

Figure 7.

Figure 7

Crystallization and orientation of PEF-co-PET copolymers. Left: Crystallization half-times calculated from the DSC isotherms at different crystallization temperatures cooling from the melt for PET and PEF-co-PET copolymers with 5, 10 and 20% ethylene furanoate units (PETF5, PETF10 and PETF20 respectively). Right: Simplified schematic showing amorphous and crystalline fractions in chain folds and inter lamellar regions of (a) unoriented PET, (b) biaxially oriented PET, (c) unoriented PEF-co-PET random copolyester, and (d) biaxially oriented PEF-co-PET random copolyester; CF:crystalline fraction, RAF: rigid amorphous fraction, MAF: mobile amorphous fraction [41].