The hysteresis loop of the fifth cycle (curves 3 and 4) shows that the losses are very small. Innovation Platform of Intelligent and Energy‐Saving Textiles, School of Textile Science and Engineering, Tiangong University, Tianjin, China . The polyurethane (PU) fibers can also be produced via the electrospinning process (Predicini and Farris, 2003). Polyurethane yarns are actually used in practically all products used in knitting techniques, for example: Polyurethane yarns have monofile and multifiber structures, with circular and square cross-sections. Polytetra-methyleneglycol (PTMG), a polyadipate, or polycaprolactone are used as the high molecular weight diol and diphenylmethane 4,4′-diisocyanate (MDI) or toluene-2,4-diisocyanate (TDI) is used as the capping agent. The tensile stress–strain properties of the two fibers just described are compared with that of linear PU films in Fig. Figure 10.13(a) is a view of the multifilament and (b) is an enlarged image marked by a circle in (a). The segmented polyurethane used for elastic polyurethane fibers is a copolymer of a soft segment and a hard segment. Thus, dependent on the manner in which they are knitted and the fibres used, base layers can, to varying degrees, provide enhanced wearer comfort through reduced chafing, moisture management, heat management, support and compression. Those made with high quality resins are extremely durable. the taylor cone is formed due to a balancing of the repulsive nature of the charge distribution on the droplet’s surface and the surface tension of the liquid (Reneker et al., 2000). Although there is a significant change in the morphology of the two samples, both of them can be used to obtain nonwoven fiber mat of approximately 10 × 10 cm2 without any bead defects (McKee et al., 2005). The desiccator with the fibres and pyrrole was first vacuum-suctioned and then opened to a nitrogen gas atmosphere at room temperature for 24 h. After the vapour deposition process, the PPy-coated fibres were taken out and washed in deionised water for 10 min. Now is time to ease your day to day life by taking advantage of UBE Eternacoll® Polycarbonate Diols! Please check your email for instructions on resetting your password. In 1994, a polyester-based elastic polyurethane fibre was produced in Japan by Kuraray instead of a polyether-based one . The sequence IAIAIAIAI corresponds to a hard segment and —I—I— I— corresponds to a soft segment. The cross-sectional area of the multifilament SMPU-3 therefore was simply calculated through magnification the cross-sectional area of a single filament by 30 times. As a polar solvent, toluene exerted a positive effect on the promotion of molar polarization, improving the antistatic property. 11.20. If you do not receive an email within 10 minutes, your email address may not be registered, Schematic diagram of electrospinning process. Products using polyurethane materials can last longer. Generally, a dry- or wet-spinning method is used for manufacturing spandex fiber but the melt-spinning method is also applied. The technique is valid only for charged polymer solutions or melts with sufficient molecular entanglements. SMP nano-fibers can be used not only in textile areas, but also in tissue engineering (Ulijn et al., 2007), scaffolding (Chen and Ma, 2004) and wound dressing (Ignatova et al., 2006). Learn about our remote access options, Innovation Platform of Intelligent and Energy‐Saving Textiles, School of Textile Science and Engineering, Tiangong University, Tianjin, China, State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin, China, Correspondence to: T‐T Li or C‐W Lou or J‐H Lin, Innovation Platform of Intelligent and Energy‐Saving Textiles, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China.