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

Author

Merima Hasani

Chalmers, Chemical and Biological Engineering, Forest Products and Chemical Engineering

Wallenberg Wood Science Center (WWSC)

U. Henniges

Alexander Idström

SuMo Biomaterials

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Lars Nordstierna

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Gunnar Westman

Wallenberg Wood Science Center (WWSC)

Chalmers, Chemical and Biological Engineering, Organic Chemistry

T. Rosenau

A. Potthast

Carbohydrate Polymers

0144-8617 (ISSN)

Vol. 98 2 1565-1572

Subject Categories

Physical Chemistry

DOI

10.1016/j.carbpol.2013.07.001

More information

Latest update

8/27/2018