Studies on the Thermostability of Modified Lyocell Dopes |
| |
| Authors: | Frank Wendler Frank Meister Thomas Heinze |
| |
| Institution: | 1. Centre of Excellence for Polysaccharide Research, Thuringian Institute for Textile and Plastics Research, D-07407 Rudolstadt, Germany;2. Institute of Organic and Macromolecular Chemistry, Friedrich Schiller University of Jena, D-07743 Jena, Germany |
| |
| Abstract: | Modification of Lyocell dopes with special additives enables the creation of new innovative materials. Additives with functional groups and active surfaces may initiate complex chemical reactions in cellulose/N-methylmorpholine-N-oxide monohydrate (NMMO) solutions. The effect of carboxylic groups on the thermostability was investigated by incorporating of sugar acids, acidic ion exchange resins (IER) and superabsorbing polymers (SAP) into the solutions. Whereas the sugar acids show strict correlations between the carboxyl group content in solution and onset temperature, viscosity reduction, coloration and by-product formation, the additives show an induction time, which finally leads to accelerated degradation reactions. The cellulose/NMMO solutions were additionally characterized by means of UV/VIS spectroscopy. |
| |
| Keywords: | additives cellulose ion exchangers Lyocell fibers N-methylmorpholine-N-oxide |
|
|
