Nano-cellulosic materials: The impact of water on their dissolution in DMAc/LiCl
Artikel i vetenskaplig tidskrift, 2013

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.

Fibre morphology

Fibrillated cellulose

Gel permeation chromatography

Accessibility

Water content

Dissolution kinetics

Författare

Merima Hasani

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Wallenberg Wood Science Center (WWSC)

U. Henniges

Organisation okänd

Alexander Idström

SuMo Biomaterials

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Lars Nordstierna

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Gunnar Westman

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi- och bioteknik, Organisk kemi

T. Rosenau

Organisation okänd

A. Potthast

Organisation okänd

Carbohydrate Polymers

0144-8617 (ISSN)

Vol. 98 2 1565-1572

Ämneskategorier

Fysikalisk kemi

DOI

10.1016/j.carbpol.2013.07.001

Mer information

Senast uppdaterat

2018-08-27