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Influence of water on swelling and dissolution of cellulose in 1-ethyl-3-methylimidazolium acetate

Carina Olsson (Institutionen för kemi- och bioteknik, Organisk kemi) ; 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)
Carbohydrate Polymers (0144-8617). Vol. 99 (2014), p. 438-446.
[Artikel, refereegranskad vetenskaplig]

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.

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



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Denna post skapades 2013-09-19. Senast ändrad 2016-12-05.
CPL Pubid: 183640

 

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Institutioner (Chalmers)

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

Ämnesområden

Materialvetenskap
Spektroskopi
Materialkemi
Polymerkemi
Pappers-, massa- och fiberteknik

Chalmers infrastruktur

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