Issue 9, 2011
From the journal:

Green Chemistry

Dimethyl phosphorothioate and phosphoroselenoate ionic liquids as solvent media for cellulosic materials†

Michael Hummel,*a   Carmen Froschauer,bc   Gerhard Laus,b   Thomas Röder,d   Holger Kopacka,b   Lauri K. J. Hauru,a   Hedda K. Weber,c   Herbert Sixtaa  and  Herwig Schottenbergerb  

* Corresponding authors

a Department of Forest Products Technology, Aalto University, Vuorimiehentie 1, Espoo, Finland
E-mail: michael.hummel@aalto.fi
Tel: +358 505124198

b Institute of General, Inorganic and Theoretical Chemistry, Faculty of Chemistry and Pharmacy, University of Innsbruck, Innrain 52a, Innsbruck, Austria

c Competence Centre of Wood Composites and Wood Chemistry K-Plus, Linz, Austria

d Lenzing AG, Department of Pulp Research, Lenzing, Austria

Abstract

A series of novel ionic liquids comprising two asymmetric phosphate-derived anions, namely dimethyl phosphorothioate and dimethyl phosphoroselenoate, and several imidazolium and non-imidazolium-based cations was prepared via a facile synthetic route. Thermal degradation was studied by dynamic thermogravimetric analysis (TGA) revealing a slightly higher stability of the imidazolium ionic liquids and an overall low thermal stability for the phosphoroselenoate salts. Long-term moisture sorption analysis showed correlation with the polarity of the cation and differences in absorption and desorption kinetics. Finally, a Eucalyptus globulus kraft paper grade pulp was dissolved and subsequently regenerated to assess the degradation of the various molecular weight fractions by size exclusion chromatography. In addition, pre-extracted xylan was subjected to the same dissolution procedure to examine the degradation of low-molecular weight components in more detail.

Graphical abstract: Dimethyl phosphorothioate and phosphoroselenoate ionic liquids as solvent media for cellulosic materials

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Article information

DOI
https://doi.org/10.1039/C1GC15407A
Article type
Paper
Submitted
13 Apr 2011
Accepted
21 Jun 2011
First published
20 Jul 2011

Green Chem., 2011,13, 2507-2517

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Dimethyl phosphorothioate and phosphoroselenoate ionic liquids as solvent media for cellulosic materials

M. Hummel, C. Froschauer, G. Laus, T. Röder, H. Kopacka, L. K. J. Hauru, H. K. Weber, H. Sixta and H. Schottenberger, Green Chem., 2011, 13, 2507 DOI: 10.1039/C1GC15407A

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