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    Wet-Spun Composite Filaments from Lignocellulose Nanofibrils/Alginate and Their Physico-Mechanical Properties

    Year: 2021

    Journal: Polymers, Volume 13, SEP

    Authors: Park, Ji-Soo; Han, Song-Yi; Bandi, Rajkumar; Lee, Eun-Ah; Cindradewi, Azelia-Wulan; Kim, Jeong-Ki; Kwon, Gu-Joong; Seo, Young-Ho; Youe, Won-Jae; Gwon, Jaegyoung; Park, Chan-Woo; Lee, Seung-Hwan

    Organizations: National Institute of Forest Science [FP0400-2016-01]; R&D Program for Forest Science Technology by Korea Forest Service (Korea Forestry Promotion Institute) [2019151D10-2023-0301]

    Keywords: lignocellulose nanofibril; alginate; wet-spinning; composite filament

    Lignocellulose nanofibrils (LCNFs) with different lignin contents were prepared using choline chloride (ChCl)/lactic acid (LA), deep eutectic solvent (DES) pretreatment, and subsequent mechanical defibrillation. The LCNFs had a diameter of 15.3-18.2 nm, which was similar to the diameter of commercial pure cellulose nanofibrils (PCNFs). The LCNFs and PCNFs were wet-spun in CaCl2 solution for filament fabrication. The addition of sodium alginate (AL) significantly improved the wet-spinnability of the LCNFs. As the AL content increased, the average diameter of the composite filaments increased, and the orientation index decreased. The increase in AL content improved the wet-spinnability of CNFs but deteriorated the tensile properties. The increase in the spinning rate resulted in an increase in the orientation index, which improved the tensile strength and elastic modulus.
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