Untersuchung des Lösungszustandes von cellulose in lösungsmittelgemischen mit N-methylmorpholin-N-oxid

Cellulose was dissolved by the usage of N-methylmorpholine-N-oxide (NMMNO) in combination with water and diethylenetriamine. The dissolving process was investigated with 0.5 % (w/v) cellulose in dependence on content of NMMNO as well as on temperature and time by means of static light scattering. The values of the apparent molar mass and the apparent radius of gyration have shown small differences at content of NMMNO from 30-41 % (w/w) and in the temperature range of 25 to 60 °C under the condition ofoptimal time. The average of molar mass, radius of gyration and the second virial coefficient of two pulps were determined. Their molar mass distributions were measured as tricarbanilates by the method of GPC-MALLS. The influence of the dissolving conditions in the solvent mixture on the molecular composition of cellulose was investigated after precipitation of dissolved cellulose and tricarbanilation. The molar mass distributions of tricarbanilated cellulose pulp and regenerated cellulose were compared. Differences were obtained and will be further investigated in nearest future.