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Studies on the Thermostability of Modified Lyocell Dopes
Author(s) -
Wendler Frank,
Meister Frank,
Heinze Thomas
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200550515
Subject(s) - lyocell , thermostability , cellulose , chemistry , polymer chemistry , polymer , chemical modification , fourier transform infrared spectroscopy , sugar , degradation (telecommunications) , organic chemistry , chemical engineering , telecommunications , computer science , engineering , enzyme , fiber
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.