Počet záznamů: 1
Activation of cellulose by 1,4-dioxane for dissolution in N,N-dimethylacetamide/LiCl
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SYSNO ASEP 0382476 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Activation of cellulose by 1,4-dioxane for dissolution in N,N-dimethylacetamide/LiCl Tvůrce(i) 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) RIDZdroj.dok. Cellulose. - : Springer - ISSN 0969-0239
Roč. 19, č. 6 (2012), s. 1893-1906Poč.str. 14 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova cellulose activation ; cellulose dissolution ; 1,4-dioxane Vědní obor RIV CD - Makromolekulární chemie CEP GAP108/12/0703 GA ČR - Grantová agentura ČR GA106/09/1348 GA ČR - Grantová agentura ČR Institucionální podpora UMCH-V - RVO:61389013 CEZ AV0Z40500505 - UMCH-V (2005-2011) UT WOS 000310538300008 DOI https://doi.org/10.1007/s10570-012-9779-0 Anotace 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. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2013
Počet záznamů: 1