Temperature Dependence of Phase Structure for Highly Drawn Ultrahigh Molecular Weight Polyethylene Using Solid-State High-Resolution 13C Nuclear Magnetic Resonance

Optimization of hot drawing process of ultra‐high molecular weight polyethylene monofilament prepared by melt spinning

“…[29][30][31] Furthermore, some of the folded molecular chain structures in lamellar crystals were more susceptible to stress-induced melting at high temperatures, both lamellar fracture and stress-induced melting [32][33][34][35] of folded molecular chains led to a decrease in grain size. Under subsequent stretching, the molten amorphous molecular chain structures were gradually reoriented and aligned along the drawing direction, forming new extended chain crystals as intergranular bridges 17 connecting lamellar fragments, which corresponds to the appearance of the hexagonal phase (100) plane's characteristic diffraction peak.…”

“…The results showed that the crystallinity and crystal orientation of the fiber change with the increase in draw ratio. The axial orientation of molecular chains and crystalline structures is affected by the draw temperature, the low temperature cannot provide sufficient energy for molecular chains and crystalline structures to align axially, while excessive temperatures cause invalid molecular chain slippage during the drawing process 17 …”

“…The axial orientation of molecular chains and crystalline structures is affected by the draw temperature, the low temperature cannot provide sufficient energy for molecular chains and crystalline structures to align axially, while excessive temperatures cause invalid molecular chain slippage during the drawing process. 17 In the literature, the relationship between crystal structure and tensile strength of UHMWPE fibers has been examined, 6,16,[18][19][20][21] however, the process of crystal structure modification impacted by draw temperature and ratio has not been described. This study investigated the synergistic effects of draw temperature and ratio on the crystal structure change process of UHMWPE fibers during the melt-spinning process and the method for improving the conversion efficiency from lamellar to extended chain structure in melt-spun fiber is investigated.…”