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Activation of cellulose by 1,4-dioxane for dissolution in N,N-dimethylacetamide/LiCl
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SYSNO ASEP 0382476 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Activation of cellulose by 1,4-dioxane for dissolution in N,N-dimethylacetamide/LiCl Author(s) Raus, Vladimír (UMCH-V) RID, ORCID
Šturcová, Adriana (UMCH-V) RID
Dybal, Jiří (UMCH-V) RID, ORCID
Šlouf, Miroslav (UMCH-V) RID, ORCID
Vacková, Taťana (UMCH-V) RID
Šálek, Petr (UMCH-V) RID, ORCID
Kobera, Libor (UMCH-V) RID, ORCID
Vlček, Petr (UMCH-V) RIDSource Title Cellulose. - : Springer - ISSN 0969-0239
Roč. 19, č. 6 (2012), s. 1893-1906Number of pages 14 s. Language eng - English Country NL - Netherlands Keywords cellulose activation ; cellulose dissolution ; 1,4-dioxane Subject RIV CD - Macromolecular Chemistry R&D Projects GAP108/12/0703 GA ČR - Czech Science Foundation (CSF) GA106/09/1348 GA ČR - Czech Science Foundation (CSF) Institutional support UMCH-V - RVO:61389013 CEZ AV0Z40500505 - UMCH-V (2005-2011) UT WOS 000310538300008 DOI https://doi.org/10.1007/s10570-012-9779-0 Annotation N,N-Dimethylacetamide/lithium chloride (DMAc/LiCl) mixture is a popular solvent system used for cellulose dissolution, analysis, and derivatization. However, a pre-treatment (activation) procedure is needed for most celluloses to dissolve readily in DMAc/LiCl. Here, an optimized version of the activation protocol based on solvent exchange to 1,4-dioxane was introduced. Its universality was demonstrated by successful activation and dissolution of six different celluloses (AVICEL, Sigmacell, cotton linters, Encell, Lincell, and Whatman paper). Dissolution times varied significantly for different cellulose types and also depended on factors such as the drying method employed or the water removal step inclusion/omission. Dioxane-activated celluloses were analyzed with a variety of methods. SEC measurements indicated low destructivity of the dioxane activation method. The infrared spectroscopy analysis showed that dioxane remained adsorbed on cellulose even after rigorous drying. In addition, upon dioxane activation, stagnation or a slight increase in the total order index of celluloses was observed. This observation was in accordance with the crystallinity index changes determined by solid-state NMR. Finally, scanning electron microscopy revealed disintegration of AVICEL particles and defibrillation of fibrous celluloses upon dioxane activation; Sigmacell remained apparently unchanged. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2013
Number of the records: 1