Journal
POLYMER
Volume 52, Issue 3, Pages 830-836Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2010.11.059
Keywords
Cellulose; Supercritical carbon dioxide; Acetylation
Categories
Funding
- Ministry of Education, Culture, Science, Sports and Technology, Japan [20246100]
- Special Coordination Funds for Promoting Science and Technology, Creation of Innovation Centers for Advanced Interdisciplinary Research Areas (Innovative Bioproduction Kobe), MEXT, Japan
- Grants-in-Aid for Scientific Research [20246100] Funding Source: KAKEN
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Natural cellulosic ramie fiber was acetylated using supercritical carbon dioxide (sc-CO2) as a reaction medium. The structure and properties of the acetylated fibers were investigated using infrared spectroscopy, scanning electron microscopy, X-ray diffraction (including synchrotron microbeam X-ray diffraction), nano-Raman scattering, and a tensile test. The acetylation reaction proceeded without using an organic solvent, and it reached to the core part of the fiber within a short period while maintaining the fiber morphology. The crystallites of cellulose triacetate II and cellulose coexist in the fiber. The acetylated fiber with an average degree of substitution of 1.9 showed high modulus (34.5 GPa) and high strength (763 MPa), which are the highest values for cellulose diacetate so far reported to date. (C) 2010 Elsevier Ltd. All rights reserved.
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