Shi Ouyang, Li Peng, Yang Chao, Jiang Haitian, Qin Liyue, Liu Wentao, Li Xiaolin, Chen Zhenming
School of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China.
Guangxi Key Laboratory of Comprehensive Utilization of Calcium Carbonate Resources, College of Materials and Environmental Engineering, Hezhou University, Hezhou 542899, China.
Polymers (Basel). 2023 Dec 28;16(1):97. doi: 10.3390/polym16010097.
In this experiment, a series of poly(propylene 2,5-furan dicarboxylate)-b-poly(ethylene glycol) (PPFEG) copolymers with different ratios were synthesized using melt polycondensation of dimethylfuran-2,5-dicarboxylate (DMFD), 1,3-propanediol (PDO) and poly(ethylene glycol) (PEG). The effect of PEG content on the crystallization behavior of the poly(propylene 2,5-furan dicarboxylate) (PPF) copolymers was investigated. For PPF, the nucleation density of the -crystals was higher than that of -crystals. As increases, the crystals are suppressed more, but at = 140 °C, the bulk of PPF has already been converted to crystals, which crystallize faster at higher nucleation densities, resulting in a difference in polymer properties. For this case, we chose to add a soft segment material, PEG, which led to an early multi-melt crystallization behavior of the PPF. The addition of PEG led to a decrease in the crystallization temperature of PPF, as well as a decrease in the cold crystallization peak of PPF. From the crystalline morphology, it can be seen that the addition of PEG caused the transformation of the PPF crystalline form to occur earlier. From the crystalline morphology of PPF at 155 °C, it can be observed that the ring-banded spherical crystals of the PPF appear slowly with increasing time. With the addition of PEG, spherical crystals of the ring band appeared earlier, and even appeared first, and then disappeared slowly.
在本实验中，使用2,5-呋喃二甲酸二甲酯（DMFD）、1,3-丙二醇（PDO）和聚乙二醇（PEG）通过熔融缩聚合成了一系列不同比例的聚（2,5-呋喃二甲酸丙二醇酯）-b-聚（乙二醇）（PPFEG）共聚物。研究了PEG含量对聚（2,5-呋喃二甲酸丙二醇酯）（PPF）共聚物结晶行为的影响。对于PPF，β-晶体的成核密度高于α-晶体。随着[具体参数]增加，β晶体受到的抑制更大，但在[具体温度] = 140 °C时，大部分PPF已转化为β晶体，其在较高成核密度下结晶更快，导致聚合物性能存在差异。对于这种情况，我们选择添加软段材料PEG，这导致PPF出现早期的多熔融结晶行为。PEG的加入导致PPF的结晶温度降低，以及PPF的冷结晶峰降低。从结晶形态可以看出，PEG的加入使PPF晶型转变提前发生。从155 °C下PPF的结晶形态可以观察到，PPF的环带球形晶体随着时间的增加缓慢出现。随着PEG的加入，环带球形晶体出现得更早，甚至先出现，然后缓慢消失。
