| dc.contributor.advisor |
Martin W. King, Committee Co-Chair |
en_US |
| dc.contributor.advisor |
Richard Kotek, Committee Chair |
en_US |
| dc.contributor.advisor |
Xiangwu Zhang, Committee Member |
en_US |
| dc.contributor.author |
Lee, Hyun Jik |
en_US |
| dc.date.accessioned |
2010-04-02T18:10:48Z |
|
| dc.date.available |
2010-04-02T18:10:48Z |
|
| dc.date.issued |
2008-04-07 |
en_US |
| dc.identifier.other |
etd-01032008-124809 |
en_US |
| dc.identifier.uri |
http://www.lib.ncsu.edu/resolver/1840.16/2148 |
|
| dc.description.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. |
en_US |
| dc.rights |
I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis
sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.
I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I
retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
en_US |
| dc.subject |
Cellulose |
en_US |
| dc.subject |
Cellulose Solvent |
en_US |
| dc.subject |
Dry Jet Wet Spinning |
en_US |
| dc.title |
Novel Cellulose Solvent System and Dry Jet Wet Spinning of Cellulose/ED/KSCN Solutions |
en_US |
| dc.degree.name |
MS |
en_US |
| dc.degree.level |
thesis |
en_US |
| dc.degree.discipline |
Textile and Apparel, Technology and Management |
en_US |
