The Effect of HPMC and CNC on the Structure and Properties of Alginate Fibers
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
The Effect of HPMC and CNC on the Structure and Properties of Alginate Fibers Meiyu Ci, Jie Liu*, Shenglong Shang, Zhiming Jiang, Ping Zhu, and Shuying Sui* College of Textile and Clothing, Institute of Functional Textiles and Advanced Materials, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266071, China (Received November 20, 2019; Revised January 29, 2020; Accepted February 8, 2020) Abstract: Bio-composite alginate fibers with binary and ternary blends were prepared by using cellulose nanocrystal (CNC) and hydroxypropyl methylcellulose (HPMC) as composite fillers through wet-spinning method. Structural, thermal, mechanical properties and surface morphology of fibers were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Thermogravimetric Analysis (TGA), Mechanical strength testing, Scanning Electron Microscopy (SEM). The thermal stability and mechanical performance of SA/HPMC and SA/HPMC/CNC composite fibers improved as the increasing of crystallinity and intermolecular H-bonding interaction of the fibers. HPMC is helpful to improve the extensibility and stiffness of alginate fibers, and CNC can further enhance the stiffness of SA/HPMC composite fibers. The tensile strength, elongation at break, the initial modulus and work at break of SA/HPMC/CNC composite fibers were superior to those of alginate fibers. Roughness of surface and tensile section of SA/HPMC and SA/HPMC/CNC composite fibers got increased. Water absorbency and salt resistance were significantly improved. Keywords: Effect, Hydroxypropyl methylcellulose, Cellulose nanocrystal, Structure and properties, Alginate fiber
HPMC, a type of a cellulose derivative that obtained from alkalization reaction and etherification modification of cellulose [19]. After chemical substitution, HPMC has superior performance than cellulose [20]. It has been extensively employed in the pharmaceutical industry as drug delivery vectors [21] and food industries as packaging film, thickener or emulsifier due to its convenient use, wide access, excellent film-formation [22]. There are plenty of flexible side chains on HPMC main chain, which could improve the mobility of macromolecular chains. Cooperating HPMC with alginate fiber could improve the properties of the fiber and reduce its cost [23]. Many works have reported blending HPMC with other polymers in order to fabricate novel materials with superior properties. Ding et al. prepared collagen/HPMC blend film with enhanced hydrophilicity and mechanical properties compared with pure collagen film [24]. However, the limited enhancement of HPMC was noted. In order to further improve mechanical properties of SA/HPMC composite fibers, a third component can be incorporated to form ternary composite fibers. In this regard, Cellulose nanocrystal (CNC), is an inherently strong cellulose-based nanomaterials with high crystallinity [25,26]. The tensile strength of CNC can reach 7.5 GPa, which i
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