Wang Jinggang, Liu Xiaoqing, Zhu Jin, Jiang Yanhua
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Polymers (Basel). 2017 Aug 24;9(9):305. doi: 10.3390/polym9090305.
Bio-based polyesters derived from 2,5-furandicarboxylic acid (FDCA), including poly (ethylene 2,5-furandicarboxylate) (PEF), poly(propylene 2,5-furandicarboxylate) (PPF), and poly(butylene 2,5-furandicarboxylate) (PBF) have been synthesized and modified with 2,2,4,4-tetramethyl-1,3-cyclobutanediol (CBDO). Copolyesters with increased glass transition temperature, good barrier and better mechanical properties, as well as higher transparency were reported in this work. The chemical structures, composition, and sequence distribution of the copolyesters were determined by ¹H NMR and C NMR. The degree of random () was close to 1 for all the copolyesters, indicating their random chemical structures. With the introduction of 10% CBDO units, the semi-crystalline PEF and PPF were changed into completely amorphous polyesters and the higher transparency was easily achieved. The glass transition temperature was increased from 87 °C for PEF to 91.1 °C for PETF-18, from 55.5 °C for PPF to 63.5 °C for PPTF-18, and from 39.0 °C for PBF to 43.5 °C for PBTF-18. The barrier properties investigation demonstrated that although the O₂ and CO₂ barrier of PEF/PPF/PBF were decreased by the addition of CBDO units, the modified copolyesters still showed good barrier properties.
源自2,5-呋喃二甲酸（FDCA）的生物基聚酯，包括聚（2,5-呋喃二甲酸乙二酯）（PEF）、聚（2,5-呋喃二甲酸丙二酯）（PPF）和聚（2,5-呋喃二甲酸丁二酯）（PBF），已通过2,2,4,4-四甲基-1,3-环丁二醇（CBDO）进行了合成和改性。本文报道了具有提高的玻璃化转变温度、良好阻隔性和更好机械性能以及更高透明度的共聚酯。通过¹H NMR和C NMR确定了共聚酯的化学结构、组成和序列分布。所有共聚酯的无规度（）均接近1，表明其具有无规化学结构。随着10% CBDO单元的引入，半结晶性的PEF和PPF转变为完全无定形的聚酯，并易于实现更高的透明度。玻璃化转变温度从PEF的87℃提高到PETF-18的91.1℃，从PPF的55.5℃提高到PPTF-18的63.5℃，从PBF的39.0℃提高到PBTF-18的43.5℃。阻隔性能研究表明，虽然添加CBDO单元会降低PEF/PPF/PBF的O₂和CO₂阻隔性，但改性后的共聚酯仍表现出良好的阻隔性能。
