Pan Siyu, Yang Haidong, Qiu Zhaobin
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Polymers (Basel). 2025 Jan 14;17(2):196. doi: 10.3390/polym17020196.
In this research, fully biobased composites consisting of poly(butylene 2,5-furandicarboxylate) (PBF) and cellulose nanocrystals (CNC) were successfully prepared through a common solution and casting method. The influence of CNC on the crystallization behavior, mechanical property, and hydrophilicity of PBF was systematically investigated. Under different crystallization processes, the crystallization of PBF was obviously promoted by CNC as a biobased nucleating agent. The Ozawa equation was not suitable to fit the nonisothermal melt crystallization kinetics of PBF and PBF/CNC composites. The nucleation activity of CNC was quantitatively calculated by the Dobreva method; moreover, the nucleation efficiency of CNC was further evaluated through the self-nucleation procedure. The isothermal melt crystallization kinetics of PBF and PBF/CNC composites was well described by the Avrami method; moreover, the crystallization mechanism and the crystal structure of PBF remained unchanged despite the presence of CNC. CNC also greatly enhanced both the mechanical property and hydrophilicity of PBF in the composites. In sum, low loadings of CNC simultaneously improved the crystallization, mechanical property, and hydrophilicity of PBF, which should be of significant importance and interest in fully biobased polymer composites from a sustainable viewpoint.
在本研究中，通过常规溶液浇铸法成功制备了由聚（2,5-呋喃二甲酸丁二醇酯）（PBF）和纤维素纳米晶体（CNC）组成的全生物基复合材料。系统研究了CNC对PBF结晶行为、力学性能和亲水性的影响。在不同的结晶过程中，作为生物基成核剂的CNC明显促进了PBF的结晶。Ozawa方程不适用于拟合PBF和PBF/CNC复合材料的非等温熔体结晶动力学。采用Dobreva方法定量计算了CNC的成核活性；此外，通过自成核程序进一步评估了CNC的成核效率。Avrami方法很好地描述了PBF和PBF/CNC复合材料的等温熔体结晶动力学；此外，尽管存在CNC，PBF的结晶机理和晶体结构保持不变。CNC还显著提高了复合材料中PBF的力学性能和亲水性。总之，低含量的CNC同时改善了PBF的结晶、力学性能和亲水性，从可持续发展的角度来看，这对于全生物基聚合物复合材料具有重要意义和价值。
