writer：?JiapingWu, Hongzhou Xie, Linbo Wu*, Bo-Geng Li, Philippe Dubois*.
keywords：Biobased polymers, Poly(ethylene furandicarboxylate), Crystallization
source：期刊
specific source：RSC Adv., 2016, 6, 101578–101586 DOI: 10.1039/C6RA21135F
Issue time：2016年

Poly(ethylene 2,5-furandicarboxylate) (PEF) is in the spotlight as a newly emerged biobased polyester in recent years. Usually, PEF exhibits very slow and weak melt crystallization behavior. In this study, PEF synthesis via transesterification polycondensation method catalyzed by 1,8-diazabicylo[5.4.0]undec-7-ene (DBU) as an organic nonmetallic catalyst was attempted. PEF with moderate molecular weight (intrinsic viscosity 0.54 dL/g) and low diethylene glycol furandicarboxylate unit content (DEGF 1.7%) was successfully synthesized and the melt crystallization kinetics and melting behavior were investigated. The DBU-catalyzed PEF exhibited rapid melt crystallization in both nonisothermal and isothermal manners. At cooling rate of 10 oC/min, a melt crystallization peak appeared around 158 oC with crystallization enthalpy of 29 J/g. DSC and WAXD results indicated a crystallinity of 27-34% after sufficient isothermal melt crystallization at 160-210 oC. A minimum of melt crystallization half time, 1.6 min, appeared at 160 oC. The equilibrium melting point of PEF was estimated to be 243 oC.