N-Methylmorpholine-N-oxide ring cleavage registration by ESR under heating conditions of the Lyocell process.
Thermal cleavage processes of N-methylmorpholine-N-oxide monohydrate (NMMO) were observed in pure NMMO as well as in cellulose/NMMO solutions by ESR at temperatures of the industrial Lyocell process ( approximately 370K). Generated radicals were attributed to the alkylnitroxyl type radicals -CH(2)-NO-CH(3) in NMMO and additional (and dominated) -CH(2)-NO-CH(2)- in cellulose/NMMO solutions. Formation of both radical types formed due to NMMO ring scission is suggested.
Technical University of Ilmenau, Institute for Micro and Nanotechnologies, Gustav-Kirchhoff-Str. 7, D-98693 Ilmenau, Germany.
A
A
Konkin
F
F
Wendler
F
F
Meister
H-K
HK
Roth
A
A
Aganov
O
O
Ambacher
D002482:Cellulose / Q000737:chemistry*; D003198:Computer Simulation; D003497:Cyclic N-Oxides / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000737:chemistry; D006358:Hot Temperature; D009025:Morpholines / Q000737:chemistry*
D003497:Cyclic N-Oxides; D005609:Free Radicals; D009025:Morpholines; D002482:Cellulose; C067960:4-methylmorpholine N-oxide