caa a22 4500 467943923 CHVBK 20180405193735.0 cr unu---uuuuu 170328e20050201xx s 000 0 eng 10.1023/B:CELL.0000049408.72396.b6 doi (NATIONALLICENCE)springer-10.1023/B:CELL.0000049408.72396.b6 (NATIONALLICENCE)springer-10.1007/s10570-004-0212-1 Discoloration of cellulose solutions in N -methylmorpholine- N -oxide (Lyocell). Part 1: Studies on model compounds and pulps [Elektronische Daten] [Immanuel Adorjan, Antje Potthast, Thomas Rosenau, Herbert Sixta, Paul Kosma] N-Methylmorpholine-N-oxide monohydrate (NMMO) is used as solvent for cellulose in the Lyocell process as a modern industrial fiber-making technology. Undesired chemical side reactions and byproduct formation in the system cellulose/NMMO/water are known to cause detrimental effects, such as chromophore formation and discoloration of the resulting fibers. A detailed kinetic study on the influence of carbonyl structures on chromophore formation in NMMO melts was carried out employing UV spectroscopy. Different sugar model compounds, such as reducing or non-reducing sugars, and sugars with additional oxidized functions, were applied. The chromophore formation rate differed widely for various reducing sugar model compounds, with pentoses generally reacting faster than hexoses, and carbohydrates with protected reducing end being largely inert. The effect of carbonyl groups on chromophore generation has been studied further using oligomers and oxidized pulps with different contents of carbonyl groups. As in the case of model compounds, also for the pulps a linear correlation between carbonyl content and chromophore formation rate was established. A distinct effect of hemicelluloses was observed. Kluwer Academic Publishers, 2005 Chromophores nationallicence Kinetics nationallicence Lyocell nationallicence Monosaccharides nationallicence NMMO nationallicence UV spectroscopy nationallicence Adorjan Immanuel Christian-Doppler-Laboratory, University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190, Vienna, Austria aut Potthast Antje Christian-Doppler-Laboratory, University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190, Vienna, Austria aut Rosenau Thomas Christian-Doppler-Laboratory, University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190, Vienna, Austria aut Sixta Herbert Lenzing AG, R & D, A-4860, Lenzing, Austria aut Kosma Paul Christian-Doppler-Laboratory, University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190, Vienna, Austria aut Cellulose Kluwer Academic Publishers 12/1(2005-02-01), 51-57 0969-0239 12:1<51 2005 12 10570 https://doi.org/10.1023/B:CELL.0000049408.72396.b6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/B:CELL.0000049408.72396.b6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sixta Herbert Lenzing AG, R & D, A-4860, Lenzing, Austria aut NATIONALLICENCE 700 1- Adorjan Immanuel Christian-Doppler-Laboratory, University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190, Vienna, Austria aut NATIONALLICENCE 700 1- Potthast Antje Christian-Doppler-Laboratory, University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190, Vienna, Austria aut NATIONALLICENCE 700 1- Rosenau Thomas Christian-Doppler-Laboratory, University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190, Vienna, Austria aut NATIONALLICENCE 700 1- Kosma Paul Christian-Doppler-Laboratory, University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190, Vienna, Austria aut NATIONALLICENCE 773 0- Cellulose Kluwer Academic Publishers 12/1(2005-02-01), 51-57 0969-0239 12:1<51 2005 12 10570 NATIONALLICENCE 856 40 https://doi.org/10.1007/s10570-004-0212-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sixta Herbert R & D, Lenzing AG, A-4860, Lenzing, Austria aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer