| Structure study of cellulose fibers wet-spun from environmentally friendly NaOH/urea aqueous solutions. | |
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MedLine Citation:
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PMID: 17472335 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In this study, structure changes of regenerated cellulose fibers wet-spun from a cotton linter pulp (degree of polymerization approximately 620) solution in an NaOH/urea solvent under different conditions were investigated by simultaneous synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). WAXD results indicated that the increase in flow rate during spinning produced a better crystal orientation and a higher degree of crystallinity, whereas a 2-fold increase in draw ratio only affected the crystal orientation. When coagulated in a H2SO4/Na2SO4 aqueous solution at 15 degrees C, the regenerated fibers exhibited the highest crystallinity and a crystal orientation comparable to that of commercial rayon fibers by the viscose method. SAXS patterns exhibited a pair of meridional maxima in all regenerated cellulose fibers, indicating the existence of a lamellar structure. A fibrillar superstructure was observed only at higher flow rates (>20 m/min). The conformation of cellulose molecules in NaOH/urea aqueous solution was also investigated by static and dynamic light scattering. It was found that cellulose chains formed aggregates with a radius of gyration, Rg, of about 232 nm and an apparent hydrodynamic radius, Rh, of about 172 nm. The NaOH/urea solvent system is low-cost and environmentally friendly, which may offer an alternative route to replace more hazardous existing methods for the production of regenerated cellulose fibers. |
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Authors:
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Xuming Chen; Christian Burger; Fen Wan; Jun Zhang; Lixia Rong; Benjamin S Hsiao; Benjamin Chu; Jie Cai; Lina Zhang |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2007-05-02 |
Journal Detail:
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Title: Biomacromolecules Volume: 8 ISSN: 1525-7797 ISO Abbreviation: Biomacromolecules Publication Date: 2007 Jun |
Date Detail:
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Created Date: 2007-06-11 Completed Date: 2007-08-09 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100892849 Medline TA: Biomacromolecules Country: United States |
Other Details:
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Languages: eng Pagination: 1918-26 Citation Subset: IM |
Affiliation:
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Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Biopolymers
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chemistry Cellulose / chemistry* Crystallization Environment Light Molecular Conformation Molecular Weight Polymers / chemistry Scattering, Radiation Sodium Hydroxide / chemistry* Solubility Temperature Urea / chemistry* Water / chemistry X-Ray Diffraction |
| Chemical | |
Reg. No./Substance:
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0/Biopolymers; 0/Polymers; 1310-73-2/Sodium Hydroxide; 57-13-6/Urea; 7732-18-5/Water; 9004-34-6/Cellulose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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