ability to dissolve cellulose, aiming at elucidating solvent structural features affecting cellulose dissolution. Synthesis procedures have been developed to, to a high extent, rely on conversions in water and microwave-assisted reactions employing a reduced number of work-up steps and ion-exchange resins that can be regenerated. Watersolutions of morpholinium hydroxides proved capable of dissolving cellulose
AZIZOV, A. M.;MOVSUMZADE, M. M.;GURBANOV, P. A., AZERB. XIM. ZH., 1982, N 6, 48-51
作者:AZIZOV, A. M.、MOVSUMZADE, M. M.、GURBANOV, P. A.
DOI:——
日期:——
US4316980A
申请人:——
公开号:US4316980A
公开(公告)日:1982-02-23
Dimethyl phosphorothioate and phosphoroselenoate ionic liquids as solvent media for cellulosic materials
作者:Michael Hummel、Carmen Froschauer、Gerhard Laus、Thomas Röder、Holger Kopacka、Lauri K. J. Hauru、Hedda K. Weber、Herbert Sixta、Herwig Schottenberger
DOI:10.1039/c1gc15407a
日期:——
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.