《Table 2 Thermal properties of PEF synthesized from furan route compared with HMF route》

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《From Furan to High Quality Bio-based Poly(ethylene furandicarboxylate)》

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a Intrinsic viscosity obtained with an Ubbelohde viscometer；b N2，the second heating scan at 10 K/min，25-280°C；c N2，heating rate 20 K/min，50-800°C

In order to evaluate the quality of PEF prepared from different FDCA（PEF-HMF and PEF-Furan，respectively），their thermal properties were investigated by DSC and TGA（Fig.6 and Table 2）.It was noted that all the PEF samples，regardless of the FDCA used as starting material，showed a glass transition temperature of~87°C，a weak melting point at~214°C and a temperature of 5%weight loss at about380°C.These results were similar to those reported[42，43]，and indicated that the thermal properties of PEF were not affected by the origin of FDCA.In another word，the possible trace impurities co-existing with HMF/FDCA did not influence the thermal properties of resulted PEF，though the coloration was observed.With FDCA preparation from furfural by Henkel reaction，not only the target product 2，5-FDCA was formed，but also the isomers，2，4-FDCA and 3，4-FDCA.Purification of 2，5-FDCA became much difficult and high-costing[11，28].The presence of 2，4-FDCA or 3，4-FDCA will seriously affect the thermal properties of resulted PEF，leading to a much lower glass transition temperature and melting temperature with also a weak crystallization[44].