超高分子量全同立构聚丙烯的纤维纺丝：熔融纺丝和熔体拉伸

Fiber Spinning of Ultrahigh Molecular Weight Isotactic Polypropylene: Melt Spinning and Melt Drawing.

作者信息

Stieglitz Lucas, Geiger Christina, Großmann Paula F, Kränzlein Moritz, Rodewald Katia, Müller-Buschbaum Peter, Rieger Bernhard

机构信息

Wacker-Lehrstuhl für Makromolekulare Chemie Catalysis Research Center TUM School of Natural Sciences, Technische Universität München, Lichtenbergstraße 4, 85748, Garching bei München, Germany.

TUM School of Natural Sciences Department of Physics, Technische Universität München, James-Franck-Straße 1, 85748, Garching, Germany.

出版信息

Chempluschem. 2023 Mar;88(3):e202300045. doi: 10.1002/cplu.202300045.

DOI:10.1002/cplu.202300045

PMID:36786339

Abstract

Herein, this work reports fiber spinning of tailored isotactic polypropylene (iPP) by melt spinning and melt drawing, yielding an adjustable diameter of 40-400 μm. The crystallinity of all obtained fibers with a molecular weight between 330-1400 kg/mol is increased by thermal annealing and investigated via differential scanning calorimetry (DSC) as well as wide angle X-ray scattering (WAXS). The potential of ultrahigh molecular weight iPP (UHMW-iPP) fibers compared to fibers manufactured from industrially available iPP becomes evident when the mechanical performance is compared: fibers spun from UHMW-iPP (1400 kg/mol) enable a tensile strength of up to 400 MPa, whereas commercially available fibers (330 kg/mol) show a tensile strength of approximately 50 MPa. However, UHMW-iPP exhibits a short timeframe, in which extrusion is possible, thereafter extrusion rupture occurs, probably induced by an increased melt viscosity.

摘要

在此，本工作报道了通过熔融纺丝和熔体拉伸对定制等规聚丙烯（iPP）进行纤维纺丝，得到直径可调节为40 - 400μm的纤维。通过热退火提高了所有分子量在330 - 1400 kg/mol之间的所得纤维的结晶度，并通过差示扫描量热法（DSC）以及广角X射线散射（WAXS）进行研究。当比较机械性能时，超高分子量iPP（UHMW - iPP）纤维与由工业可用iPP制造的纤维相比的潜力变得明显：由UHMW - iPP（1400 kg/mol）纺出的纤维能够实现高达400 MPa的拉伸强度，而市售纤维（330 kg/mol）的拉伸强度约为50 MPa。然而，UHMW - iPP表现出较短的可挤出时间范围，此后会发生挤出破裂，这可能是由熔体粘度增加引起的。