Effects of polymorphs on dissolution of cellulose in NaOH/urea aqueous solution

•The crystal type of cellulose had great impact on cellulose dissolution.•The solubility of the cellulose I, II, and III was progressively decreased.•All the cellulose solutions showed good thermal stability.•The ability of celluloses to form hydrogen bonds with sodium hydroxides was similar.•The ab...

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Bibliographic Details
Published in:Carbohydrate polymers 2015-07, Vol.125, p.85-91
Main Authors: Chen, Xiong, Chen, Jinghuan, You, Tingting, Wang, Kun, Xu, Feng
Format: Article
Language:English
Subjects:
Cellulose
Cellulose - chemistry
Crystallization
NaOH/urea
Polymorphs
Sodium Hydroxide - chemistry
Solubility
Solutions - chemistry
Urea - chemistry
Water - chemistry
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Summary:•The crystal type of cellulose had great impact on cellulose dissolution.•The solubility of the cellulose I, II, and III was progressively decreased.•All the cellulose solutions showed good thermal stability.•The ability of celluloses to form hydrogen bonds with sodium hydroxides was similar.•The ability of cellulose I, II, III, and IV associated with urea was gradually increased in cellulose solution. This study focused on the effect of cellulose crystal type on the dissolution of cellulose in aqueous NaOH/urea. Cellulose I, II, IIII, and IVI were prepared and characterized. Subsequently, the solubility of these cellulose samples in aqueous NaOH/urea was tested and the mechanism was determined by a combination of 1H NMR spectroscopy and differential scanning calorimetry (DSC). The results indicated that, compared with the degree of polymerization (DP) and crystallinity index of cellulose, the cellulose crystal type had greater impact on cellulose dissolution. Specially, the solubility of the cellulose I, II, and III was progressively decreased, probably due to different hydrogen bond network and packing energy in it. The ability of cellulose I, II, III, and IV to form hydrogen bonds with sodium hydroxides was nearly the same, while gradually increased when cellulose preparations were associated with urea. Moreover, all the cellulose solutions showed good thermal stability.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2015.02.054