Influence of water on swelling and dissolution of cellulose in 1-ethyl-3-methylimidazolium acetate
Artikel i vetenskaplig tidskrift, 2014

In this study the effect of residual coagulation medium (water) on cellulose dissolution in an ionic liquid is discussed. Solubility of dissolving grade pulp; HWP and SWP, and microcrystalline cellulose in binary solvents, mixtures of 1-ethyl-3-methyl-imidazolium acetate and water, was investigated by turbidity measurements, light microscopy, rheometry, and CP/MAS 13C-NMR spectroscopy. The viscoelastic properties of the cellulose solutions imply that residual water affect the cellulose dissolution. However, it is not obvious that this always necessarily poses serious drawbacks for the solution properties or that the effects are as severe as previously believed. Turbidity measurements, viscosity data and crystallinity of the regenerated cellulose correlated well and an increased conversion to cellulose II was found at low water and cellulose contents with an apparent maximum of conversion at 2–5 wt% water. At high water content, above 10 wt%, dissolution and conversion was largely inhibited.

Ionic liquids EMIMAc Regenerated cellulose Rheology CP/MAS 13C-NMR spectroscopy Cellulose allomorph

Författare

Carina Olsson

Chalmers, Kemi- och bioteknik, Organisk kemi

Alexander Idström

SuMo Biomaterials

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Lars Nordstierna

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Gunnar Westman

Chalmers, Kemi- och bioteknik, Organisk kemi

Carbohydrate Polymers

0144-8617 (ISSN)

Vol. 99 438-446

Ämneskategorier

Polymerkemi

Analytisk kemi

Pappers-, massa- och fiberteknik

Materialkemi

Styrkeområden

Materialvetenskap

DOI

10.1016/j.carbpol.2013.08.042

Mer information

Skapat

2017-10-07