Novel Cellulose Solvent System and Dry Jet Wet Spinning of Cellulose/ED/KSCN Solutions

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Title: Novel Cellulose Solvent System and Dry Jet Wet Spinning of Cellulose/ED/KSCN Solutions
Author: Lee, Hyun Jik
Advisors: Martin W. King, Committee Co-Chair
Richard Kotek, Committee Chair
Xiangwu Zhang, Committee Member
Abstract: The ethylenediamine/potassium thiocyanate salt (ED⁄KSCN) system was found to be a novel solvent system for the dissolution of cellulose. The solubility of KSCN in ED, the dissolution of cellulose, proper coagulants and coagulation rate of cellulose⁄ED⁄KSCN solution, dry jet wet spinning process of cellulose⁄ED⁄KSCN (7⁄65⁄35, w⁄w) solution and physical properties of cellulose fibers via the ED⁄KSCN solvent system were investigated. The maximum solubility of KSCN in ED was 44 wt% at room temperature and the ED⁄KSCN solvent had the best dissolving power on cellulose in ratio of ED⁄KSCN 65/35 (w⁄w). The dissolution of cellulose took place at a high temperature (60-70 °C), and the maximum solubility was achieved 12 wt% for cellulose of DP 450 in the ED⁄KSCN 65⁄35 (w⁄w). Several different coagulants were tested for coagulation study and methanol was found to be a proper coagulant for our solvent system. Coagulation rate of methanol in the cellulose/ED⁄KSCN (7⁄65⁄35) solution was also calculated as 3.75 x 10-1 mm⁄min1⁄2. Cellulose fibers via the ED⁄KSCN solvent system were successfully produced by the dry jet wet spinning system. Cellulose fibers showed excellent mechanical properties compared to commercialized cellulose fibers such as Lyocell and rayon fibers. In our spinning system, spin draw ratio affected the mechanical properties of fibers the most. As the spin draw ratio increased, the fiber tenacity and fiber modulus tended to increase gradually, but fiber elongation decreased. For the morphology of cellulose fibers via the ED⁄KSCN solvent system, the fiber showed a round shape and a relatively compact structure, and micro-fibrils were not observed.
Date: 2008-04-07
Degree: MS
Discipline: Textile and Apparel, Technology and Management
URI: http://www.lib.ncsu.edu/resolver/1840.16/2148


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