The most popular brand names of polyurethane yarns are Lycra, Dorlastan, Glospan and Cleerspan, Roica, and Linel. Samples of PPy-coated PA6 fibres and PPy-coated PU fibres were both prepared under the same conditions. J. Hu, Q. Meng, in Functional Textiles for Improved Performance, Protection and Health, 2011. They were then taken out and the residual oxidising solution on the fibre surface was removed by a filter paper. In fact, it is even more durable than rubber and can be stretched more than 500 percent without breaking. Min. The fibres soaked with oxidising agent were transferred to a glass desiccator in which a beaker containing l0 ml of pyrrole monomer was placed. The soft segments comprise the larger portion of the elastomer and, therefore, determine the physical properties of the elastomer. The main structure of the material is a semi-rigid polyurethane foam in which are incorporated fiber strands oriented parallel to the surface. In an LFI system, chopped fiber and polyurethane components are combined and delivered to the mold cavity in a continuous process. 3.34).22. Inquire Now. 6,437 polyurethane fiber products are offered for sale by suppliers on Alibaba.com, of which fiber optic equipment accounts for 1%. Polyurethane (PUR and PU) is a polymer composed of organic units joined by carbamate (urethane) links. Depending on these reinforcement rates and alkali treatment, the mechanical properties of composites such as strength, elongation and modulus were investigated. The branched PU fibers can be elongated up to 1300% strain at break, while the linear fiber and film reached 970% and 830% strain at break, respectively. Simultaneously, a polyurethane metering machine delivers the reactive polyurethane components, polyol and isocyanate, to the mix head, where they saturate the chopped glass fibers. Spandex has elastomeric, rubberlike qualities and is very durable. • Blend stability - Nonionic, can be blended with various materials. The aim of this work to investigate the effect of glass fiber (GF) on the thermal properties of sugar palm (SP)/thermoplastic polyurethane (TPU) hybrid composites. Pyrrole (99%) and ferric chloride hexahydrate (FeCl3.6H2O) were purchased from the Sigma-Aldrich Chemical Company. A single fiber of the produced multi-filament SMPU fibers was attached to the SEM sample holder. Polyurethane fibers, sometimes called Spandex or Elastane, are synthetic fibers in which the fiber forming substance is a polymer consisting of at least 85 percent segmented polyurethane. According to a Textile Intelligence report (2011), the demand for elastane doubled between 2000 and 2010, a fact reflected in the 2005 estimation that 35–40% of all clothing in developed markets contained a percentage of the filament form of the fibre (Holmes, 2005). While most polyurethanes are thermosetting polymers that do not melt when heated, thermoplastic polyurethanes are also available.. Polyurethane polymers are traditionally and most commonly formed by reacting a di- or triisocyanate with a polyol.Since polyurethanes contain two … Plei-Tech ® 10 offers outstanding cut, abrasion, and solvent resistance. The cross-sectional area of SMPU-3 was measured as 14 μm2 also in the same way while that of SMPU-1 has not been measured since the fibers in it cannot easily be separated from each other. Polyurethane made its way into apparel with DuPont’s Spandex fiber renamed Lycra. Changing the chemical composition of polyurethane or adding fiber or other filler reinforcement results in a wide set of materials with different properties. All of the chemicals in the highest available grades were used as received without undergoing any purification. Elastane fibres stretch to at least three times their original length, but in addition will rapidly revert to this length. Thermoplastic polyurethane elastomers are molded and shaped into many different parts. Du Pont also developed a polyester-based filament [33]. Problem with image or description? Yarns with a multifiber structure are used widely in the knitting industry. Undoped TPU fiber, 1% by weight of multi-walled carbon nanotubes (MWCNTs) doped TPU fiber and 1% by weight of graphene doped TPU fiber were obtained seperatally by electrospin method. This external electric field leads to electric charges on the polymer surface that overcome the surface tension, and consequently a jet is produced. 11.21. Stretch yarn refers to extensible yarn manufactured from rubber or more usually synthetic polyurethane fibres, known generically as elastane or spandex. SEM images of PBA fibers after a treatment at 50 °C, 80 RH% for 190 hours: (left) 500x; and (right) 2000x. The measurements were made according to ASTM D 3368 using an Instron® tensile tester operating at a crosshead displacement rate of 15 mm/min (McKee et al., 2005) Clearly, Fig. For example, polyester-based urethane elastomers have better oxidative and high temperature stability than polyether-based polyurethanes, but have lower hydrolytic stability and low-temperature flexibility. Considering their potential applications in smart textiles, two material systems were examined in the present study: polycaprolactam (PA6) fibres coated with PPy and polyurethane (PU) fibres (Lycra™) coated with PPy. Takashi Tsurumi, in Advanced Fiber Spinning Technology, 1994. Jinlian Hu, in Advances in Shape Memory Polymers, 2013. In future, as a further investigation on polyurethane / coconut coir foam panel, the Jinlian HU, in Shape Memory Polymers and Textiles, 2007. Here I is diisocyanate, A is diamine and — is high molecular weight diol. 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. The linear density of the PA6 yarn is 702 denier/68 F and that of polyurethane yarn is 40 denier/5 F. PPy-coated fibres were obtained by the chemical vapour deposition method. Since its invention by DuPont in 1959, elastane has become increasingly popular for sport and leisure wear due to its strength and durability, so that of the various types of stretch fibre it is currently the one most commonly used in sportswear. The tensile stress–strain properties of the two fibers just described are compared with that of linear PU films in Fig. 11.22. Fabrics coated with nano-fibers from SMPs can neutralize hazard agents without decreasing the air and water vapor permeability of the fabrics. The SEM view of SMPU-3 is shown in Fig. The rheological behavior of the linear and branched PU fiber solutions in THF (10 wt% PU) is considerably different. It is prepared by the reaction between 1,3-diamino-4,6-dihydroxybenzene dihydrogen chloride and terephthalic acid, in the presence of polyphosphoric acid. The segmented polyurethane used for elastic polyurethane fibers is a copolymer of a soft segment and a hard segment. There are 6,427 suppliers who sells polyurethane fiber on Alibaba.com, mainly located in Asia. Figure 11.3 shows a schematic diagram of the electrospinning process. The accelerated voltage of the electron beam was 20 kV and the secondary electron images were recorded by the CCD system in the SEM. (1970) as shown in Fig. SEM views of SMPU-3: (a) view of multifilament (x500); (b) view of an isolated single filament SMPU-3 (x4000). 11.5. The polyurethane (PU) fibers can also be produced via the electrospinning process (Predicini and Farris, 2003). In order to improve its chlorine resistance, many research works have been performed. This electrical force can also lead to a very thin jet as it travels. Polyurethane solutions were spun via needle electrospinning method. 11.11. The lower value of zero-shear viscosity of the branched PU fiber solution is attributed to the fact that the branched polymer chain has small hydrodynamic volume compared to that of the linear PU fiber solution (McKee et al, 2005). Fibers with ranges of diameters less than 1000 nm are very difficult to obtain from other conventional fiber production techniques. A robotic arm directs the mixing head over the mold as the mixture is poured into … 10.13. Similarly technical knitted garments offering improved performance and recovery through varying levels of support and compression can be achieved by altering fibre content, yarn type, knit structure and stitch size throughout the same garment. properties with different fiber compositions. Although the tensile strength of PBO fibers is higher than that of p-aramid fibers, PBO fibers are more susceptible to degradation when exposed to moisture, high temperature, and sunlight (both UV and visible light). In this study; 3 different fibers were produced. SMEs were observed in this kind of material. E. Mielicka, in Advances in Knitting Technology, 2011. resistance to mildew and does not shrink when exposed to water. The final level of stretch, support or compression of the knit fabric or knitted garment can be determined by the percentage of elastane in the fabric, stitch structures and the strategic positioning of combinations of these on the body surface, plus specific finishing methods. Polyurethane (PU) foam can be rigid or flexible; rigid foams are used for The hysteresis loop of the fifth cycle (curves 3 and 4) shows that the losses are very small. The fiber is produced by reacting a polyester with a diisocyanate. The commercial multifilaments of PA6 with triangular profile were supplied by Dupont, and multifilament PU yarn was supplied by Sunikorn Knitters Limited (Hong Kong). As the charge is increased above a critical voltage, a stable jet is discharged from the tip of the Taylor cone. Polyurethane yarns exhibit high resistance to acid and alkali, and are resistant to yellowing. The fibre has excellent resistance to chlorine and light. Hu et al. There are two methods of wet spinning, one using a solution of the final polymer and the other a prepolymer. For example, linear PU (Mw = 42 000 g/mol and Mw/Mn = 1.56) based on poly(tetramethylene oxide) polyester (soft segment) with 2000 g/mol and 35 wt% hard segment produces fibers with average diameters of 5.5 ± 1.8 ∝ m (Figure 11.4a). They demonstrate resistance to oils and fats, and some types also have resistance to chlorine. FESEM (field emission scanning electron microscopy) images of electrospun (a) linear poly(urethane urea) and (b) highly branched poly(urethane urea) fibers described in the text. In this method fiber properties depend on electric field uniformity, polymer viscosity, electric field strength and distance between the nozzle and collector. 11.4 were obtained using the electrospinning method at 20 kV, 10 ml/h volumetric flow rate, and 20 cm from the syringe needle to the collecting target (McKee et al., 2005). Alongside the obvious advantages of fewer seams, open meshes of varying sizes can be knitted alongside solid structures, thus enhancing heat dispersal at strategic points on the body. Owing to its high elongation, low linear density, transparency and other physical and chemical features, polyurethane yarn has found wide applications in the textile industry, replacing rubber yarn, which was used in the production of bathing suits and later in corsetry and hosiery. 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