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Nano-cellulosic materials: The impact of water on their dissolution in DMAc/LiCl

Merima Hasani (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik) ; U. Henniges ; Alexander Idström (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; SuMo Biomaterials) ; Lars Nordstierna (Institutionen för kemi- och bioteknik, Teknisk ytkemi) ; Gunnar Westman (Institutionen för kemi- och bioteknik, Organisk kemi) ; T. Rosenau ; A. Potthast
Carbohydrate Polymers (0144-8617). Vol. 98 (2013), 2, p. 1565-1572.
[Artikel, refereegranskad vetenskaplig]

The dissolution behaviour of disassociated cellulosic materials in N,N-dimethylacetamide/lithium chloride (DMAc/LiCl) was investigated. The parameters monitored were chromatographic elution profiles and recovered mass by means of gel permeation chromatography (GPC) with RI detection. In order to elucidate the impact of the disassembly on cellulosic fibres, comparative studies were performed with the non-disassociated cellulose counterparts. The importance of the presence of water was addressed by Karl Fischer titration and solvent exchange experiments. Morphological changes during the dissolution process were studied by scanning electron microscopy (SEM). Dissolution of fibrillated cellulosic materials is impeded compared to the non-fibrillated material. This is a consequence of the high-surface-area fibrils prone to retain high amounts of water. Dissolution behaviour of nano-crystalline cellulosic materials appeared to be source-dependent. Due to the absence of entangled networks, these materials retain only water bound at the surface of the nano-crystallites, indicative of both the exposed surface area and solubility. The small cellulose nano-particles extracted from dissolving pulp show lower solubility compared to the large NCC particles from cotton.

Nyckelord: Accessibility; Dissolution kinetics; Fibre morphology; Fibrillated cellulose; Gel permeation chromatography; Water content



Denna post skapades 2013-11-26. Senast ändrad 2016-03-23.
CPL Pubid: 187475

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik (2005-2014)
Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
SuMo Biomaterials
Institutionen för kemi- och bioteknik, Organisk kemi (2006-2014)

Ämnesområden

Yt- och kolloidkemi

Chalmers infrastruktur