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Statements

Subject Item
n2:RIV%2F61389013%3A_____%2F12%3A00382476%21RIV13-AV0-61389013
rdf:type
skos:Concept n13:Vysledek
dcterms:description
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. 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.
dcterms:title
Activation of cellulose by 1,4-dioxane for dissolution in N,N-dimethylacetamide/LiCl Activation of cellulose by 1,4-dioxane for dissolution in N,N-dimethylacetamide/LiCl
skos:prefLabel
Activation of cellulose by 1,4-dioxane for dissolution in N,N-dimethylacetamide/LiCl Activation of cellulose by 1,4-dioxane for dissolution in N,N-dimethylacetamide/LiCl
skos:notation
RIV/61389013:_____/12:00382476!RIV13-AV0-61389013
n13:predkladatel
n14:ico%3A61389013
n3:aktivita
n15:P n15:I n15:Z
n3:aktivity
I, P(GA106/09/1348), P(GAP108/12/0703), Z(AV0Z40500505)
n3:cisloPeriodika
6
n3:dodaniDat
n11:2013
n3:domaciTvurceVysledku
n5:6354068 n5:5184355 n5:6644996 n5:1926284 n5:1534645 n5:4252454 n5:1518755 n5:1697978
n3:druhVysledku
n9:J
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n12:predkladatel
n3:idSjednocenehoVysledku
120945
n3:idVysledku
RIV/61389013:_____/12:00382476
n3:jazykVysledku
n10:eng
n3:klicovaSlova
cellulose activation; cellulose dissolution; 1,4-dioxane
n3:klicoveSlovo
n20:4-dioxane n20:cellulose%20activation n20:1 n20:cellulose%20dissolution
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[FEC46A76E10D]
n3:nazevZdroje
Cellulose
n3:obor
n19:CD
n3:pocetDomacichTvurcuVysledku
8
n3:pocetTvurcuVysledku
8
n3:projekt
n18:GA106%2F09%2F1348 n18:GAP108%2F12%2F0703
n3:rokUplatneniVysledku
n11:2012
n3:svazekPeriodika
19
n3:tvurceVysledku
Vacková, Taťána Vlček, Petr Kobera, Libor Raus, Vladimír Šturcová, Adriana Šlouf, Miroslav Šálek, Petr Dybal, Jiří
n3:wos
000310538300008
n3:zamer
n4:AV0Z40500505
s:issn
0969-0239
s:numberOfPages
14
n7:doi
10.1007/s10570-012-9779-0