Abstract
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 (∼370 K). 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.
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