Preparation and properties of chemical cellulose from ascidian tunic and their regenerated cellulose fibers
Autor: | Sang-Hoon You, Young-Seok Koo, Young-Soo Wang, Han-Do Kim |
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Rok vydání: | 2002 |
Předmět: | |
Zdroj: | Journal of Applied Polymer Science. 85:1634-1643 |
ISSN: | 1097-4628 0021-8995 |
Popis: | Chemical cellulose (dissolving pulp) was prepared from ascidian tunic by modified paper-pulp process (prehydrolysis with acidic aqueous solution of H2SO4, digestion with alkali aqueous solution of NaOH/Na2S, bleaching with aqueous NaOCl solution, and washing with acetone/water). The α- cellulose content and the degree of polymerization (DPw) of the chemical cellulose was about 98 wt % and 918, respectively. The Japanese Industrial Standard (JIS) whiteness of the chemical cellulose was about 98%. From the X-ray diffraction patterns and 13C-NMR spectrum, it was found that the chemical cellulose obtained here has cellulose Iβ crystal structure. A new regenerated cellulose fiber was prepared from the chemical cellulose by dry–wet spinning using N-methylmorpholine- N-oxide (NMMO)/water (87/13 wt %) as solvent. The new regenerated cellulose fiber prepared in this study has a higher ratio of wet-to-dry strength ( |
Databáze: | OpenAIRE |
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