Article

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

  • Antje PotthastAffiliated withUniversity of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • , Thomas RosenauAffiliated withUniversity of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • , Richard BuchnerAffiliated withUniversity of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • , Thomas RöderAffiliated withUniversity of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • , Gerald EbnerAffiliated withUniversity of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • , Hartmut BruglachnerAffiliated withUniversity of Agricultural Sciences Vienna, Christian-Doppler-Laboratory
  • , Herbert SixtaAffiliated withLenzing AG, Research and Development
  • , Paul KosmaAffiliated withUniversity of Agricultural Sciences Vienna, Christian-Doppler-Laboratory

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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 solution DMAc/LiCl Dynamic light scattering Hydrolysis Solubility Solvatochromism Water content