Höhnemann Tim, Steinmann Mark, Schindler Stefan, Hoss Martin, König Simon, Ota Antje, Dauner Martin, Buchmeiser Michael R
German Institutes of Textile and Fiber Research, Koerschtalstr. 26, D-73770 Denkendorf, Germany.
Materials (Basel). 2021 Feb 23;14(4):1044. doi: 10.3390/ma14041044.
We report on the pilot scale synthesis and melt spinning of poly(ethylene furanoate) (PEF), a promising bio-based fiber polymer that can heave mechanical properties in the range of commercial poly(ethylene terephthalate) (PET) fibers. Catalyst optimization and solid state polycondensation (SSP) allowed for intrinsic viscosities of PEF of up to 0.85 dL·g. Melt-spun multifilament yarns reached a tensile strength of up to 65 cN·tex with an elongation of 6% and a modulus of 1370 cN·tex. The crystallization behavior of PEF was investigated by differential scanning calorimetry (DSC) and XRD after each process step, i.e., after polymerization, SSP, melt spinning, drawing, and recycling. After SSP, the previously amorphous polymer showed a crystallinity of 47%, which was in accordance with literature. The corresponding XRD diffractograms showed signals attributable to α-PEF. Additional, clearly assignable signals at 2θ > 30° are discussed. A completely amorphous structure was observed by XRD for as-spun yarns, while a crystalline phase was detected on drawn yarns; however, it was less pronounced than for the granules and independent of the winding speed.
我们报道了聚（呋喃二甲酸乙二酯）（PEF）的中试规模合成与熔融纺丝，PEF是一种很有前景的生物基纤维聚合物，其机械性能可达到商用聚对苯二甲酸乙二酯（PET）纤维的范围。通过催化剂优化和固态缩聚（SSP），PEF的特性粘度可达0.85 dL·g。熔纺复丝纱线的拉伸强度高达65 cN·tex，伸长率为6%，模量为1370 cN·tex。在每个工艺步骤之后，即聚合、SSP、熔纺、拉伸和回收之后，通过差示扫描量热法（DSC）和X射线衍射（XRD）研究了PEF的结晶行为。在SSP之后，之前的非晶态聚合物的结晶度为47%，这与文献一致。相应的XRD衍射图显示出可归因于α-PEF的信号。讨论了在2θ > 30°处的其他可明确归属的信号。通过XRD观察到，初生纱线为完全非晶态结构，而拉伸纱线上检测到了结晶相；然而，其结晶程度不如颗粒明显，且与卷绕速度无关。
