Cellulose

, Volume 9, Issue 1, pp 41–53

The cellulose solvent system N,N-dimethylacetamide/lithium chloride revisited: the effect of water on physicochemical properties and chemical stability

Authors

  • Antje Potthast
    • University of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • Thomas Rosenau
    • University of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • Richard Buchner
    • University of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • Thomas Röder
    • University of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • Gerald Ebner
    • University of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • Hartmut Bruglachner
    • University of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • Herbert Sixta
    • Lenzing AG, Research and Development
  • Paul Kosma
    • University of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
Article

DOI: 10.1023/A:1015811712657

Cite this article as:
Potthast, A., Rosenau, T., Buchner, R. et al. Cellulose (2002) 9: 41. doi:10.1023/A:1015811712657

Abstract

The water content in the binary systemN,N-dimethylacetamide/lithium chloride (DMAc/LiCl), acommon cellulose solvent, has been proven to be a crucial parameter. A quickdetermination of water content in DMAc based on the solvatochromism of aUV-active betain probe dye has been developed and validated. An analogousmethod, based on the solvatochromic fluorescence shift ofZelinskij's dye, which strongly depends on thesolventpolarity, was established for water determination in DMAc containing LiCl.Precise physicochemical data of the system DMAc/LiCl, such as density,viscosity, and conductivity, have been obtained. The limiting solubility forLiCl in absolute DMAc is 8.46 wt%. As shown by lightscattering experiments, water in DMAc/LiCl induces aggregation upon standingforlonger periods of time, which is even more prominent for diluted solutions andthose having a poor state of dissolution.

Cellulose solutionDMAc/LiClDynamic light scatteringHydrolysisSolubilitySolvatochromismWater content

Copyright information

© Kluwer Academic Publishers 2002