DBU-Catalyzed Biobased Poly(ethylene2,5-furandicarboxylate) Polyester with Rapid Melt Crystallization: Synthesis, CrystallizationKinetics and Melting Behavior
DBU-Catalyzed Biobased Poly(ethylene2,5-furandicarboxylate) Polyester with Rapid Melt Crystallization: Synthesis, CrystallizationKinetics and Melting Behavior
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DBU 催化的快速熔融结晶生物基聚（2,5-呋喃二甲酸乙二醇酯）聚酯：合成、结晶动力学和熔融行为
DOI：
10.1039/c6ra21135f
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
Philippe Dubois
中科院分区：
文献类型：
--
作者：
Jiaping Wu;Hongzhou Xie;Linbo Wu;Bo-Geng Li;Philippe Dubois
聚（2，5-呋喃二甲酸乙二醇酯）（PEF）作为一种新兴的生物基聚酯而备受关注。通常，PEF表现出非常缓慢和弱的熔融结晶行为。本研究以1，8-二氮杂双环[5.4.0]十一碳-7-烯（DBU）为有机非金属催化剂，采用酯交换缩聚法合成了聚乙二醇单甲醚（PEF）。成功合成了具有中等分子量（特性粘度0.54 dL g−1）和低二甘醇呋喃二甲酸酯单元含量（DEGF 1.7%）的PEF，并研究了熔融结晶动力学和熔融行为。DBU催化的PEF在非等温和等温两种方式下都表现出快速熔融结晶。在10 °C min-1的冷却速率下，在158 °C左右出现熔融结晶峰，结晶焓为29 J g-1。DSC和WAXD结果表明，在160-210 °C下充分等温熔融结晶后，结晶度为27-34%。在160 °C下出现熔融结晶半衰期的最小值1.6 min。PEF的平衡熔点估计为243 °C。
Poly(ethylene 2,5-furandicarboxylate) (PEF) is in the spotlight as a new emerging biobased polyester. Usually, PEF exhibits very slow and weak melt crystallization behavior. In this study, PEF synthesis via a transesterification polycondensation method catalyzed by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as an organic nonmetallic catalyst was attempted. PEF with a moderate molecular weight (intrinsic viscosity 0.54 dL g−1) 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 °C min−1, a melt crystallization peak appeared around 158 °C with a crystallization enthalpy of 29 J g−1. DSC and WAXD results indicated a crystallinity of 27–34% after sufficient isothermal melt crystallization at 160–210 °C. A minimum of melt crystallization half time, 1.6 min, appeared at 160 °C. The equilibrium melting point of PEF was estimated to be 243 °C.