Zusammenfassung
The influence of temp. and water on the dissoln. of cellulose in the solvent system LiCl/DMAc was examd. The phase diagrams performed in the system without water showed that higher amts. of cellulose can be dissolved at 5°, whereas at 25°, smaller concns. of LiCl in DMAc are sufficient to solubilize some cellulose. Furthermore a relation between the concn. of LiCl and the max. possible water ...
Zusammenfassung
The influence of temp. and water on the dissoln. of cellulose in the solvent system LiCl/DMAc was examd. The phase diagrams performed in the system without water showed that higher amts. of cellulose can be dissolved at 5°, whereas at 25°, smaller concns. of LiCl in DMAc are sufficient to solubilize some cellulose. Furthermore a relation between the concn. of LiCl and the max. possible water content was established. The anal. showed that the ratio between water and LiCl in the mixt. has to be <2:1; otherwise, complete dissoln. of cellulose cannot be achieved. The relation between LiCl and anhydro-glucose units was examd. as well. The results implied the breakdown of 2 hydrogen bonds during the soln. process because the interaction of 2 LiCl/DMAc complexes with 1 glucose unit was required. The viscosity of the system was investigated also, but no special behavior was obsd.
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