Influence of cross-section shape on structure and properties of Lyocell fibers
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ORIGINAL RESEARCH
Influence of cross-section shape on structure and properties of Lyocell fibers Huihui Zhang Huili Shao
. Yang Shen . Kevin J. Edgar . Gesheng Yang .
Received: 19 August 2020 / Accepted: 21 November 2020 Ó Springer Nature B.V. 2020
Abstract Three kinds of Lyocell fibers with different cross-sections including circular, H-shape, and Y-shape (abbreviated as O-, H-, and Y-Lyocell) were prepared by a dry-jet wet spinning method. The effects of cross-sectional shape on structure and properties of Lyocell fibers were evaluated. The results showed H-Lyocell and Y-Lyocell exhibited triangular and dumbbell cross-sections, respectively, due to die swell. Both non-roundness factor and crystallinity of different cross-sectional Lyocell fibers were in the order of H-Lyocell [ Y-Lyocell [ O-Lyocell. All cross-sectional Lyocell fibers showed similar values of fineness and tensile strength. The profiled Lyocell fibers were superior to circular Lyocell fibers in terms of luster, dyeing properties, and moisture regain. The dye uptake and fixation rate of Lyocell fibers were influenced by shape in the order H-Lyocell [ YLyocell [ O-Lyocell; while for luster and moisture H. Zhang (&) Y. Shen G. Yang H. Shao State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China e-mail: [email protected] K. J. Edgar Macromolecules Innovation Institute, Virginia Tech, Blacksburg, VA 24061, USA K. J. Edgar Department of Sustainable Biomaterials, Virginia Tech, Blacksburg, VA 24061, USA
regain the order was Y-Lyocell [ H-Lyocell [ OLyocell. Profiled Lyocell fibers are expected to open broader prospects in different textile or composite fields due to their various advantages versus conventional circular Lyocell fibers. Keywords Lyocell Profiled fiber Fiber crosssection Structure Properties Introduction As a relatively new kind of regenerated cellulose fiber, Lyocell fiber is spun from cellulose solution in aqueous N-methylmorpholine-N-oxide (NMMO) by a dry-jet wet spinning process (Fink et al. 2001). Lyocell fiber shows higher tenacity and modulus (especially in the wet state), and lower shrinkage than viscose fiber; it also has good comfort properties, and soft feel (Chavan and Patra 2004; Jiang et al. 2012; Kreze and Malej 2003). Lyocell has proven to be attractive to producers and consumers for reasons beyond its more benign, carbon disulfide-free manufacturing process. It has proven to have useful properties, it is relatively simple to manufacture, and it uses the ultimate green solvent, water, in combination with NMMO that can be readily recycled. However, its relatively high cost restricts more widespread application of Lyocell fiber. Partly as a result, at present Lyocell fibers are mainly used to produce high-end clothing (Sayyed et al. 2019; Zhang et al. 2018). Therefore, it would be very useful to
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Cellulose
develop differential or functional fib
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