Results 151 to 160 of about 4,063 (203)

On the conformation of the cellulose solvent N-methylmorpholine-N-oxide (NMMO) in solution

Polymer, 2003
Abstract The N-oxide group of the cellulose solvent N-methylmorpholine-N-oxide showed a strong preference for the axial position compared with N-methyl as determined by NMR experiments and computational studies. In solvents with negligible solvent–solute interaction, about 95% of the NMMO molecules obtained a typical chair conformation with an axial ...
T Rosenau, Antje Potthast, Paul Kosma
exaly   +2 more sources

Phase diagram of a cellulose solvent: N-methylmorpholine–N-oxide–water mixtures

Polymer, 2003
Abstract The phase diagram of the N -methylmorpholine– N -oxide–H 2 O mixtures from 0 to 100% has been determined. Three crystalline hydrates have been identified, the already known monohydrate, a dihydrate and a hydrate composed of 8 water molecules per NMMO.
Biganska, Olga, Navard, Patrick
exaly   +3 more sources

Thermal hazards evaluation of the synthesis of N-methylmorpholine-N-oxide

Journal of Thermal Analysis and Calorimetry, 2021
This study focused on the assessment of thermal safety associated with the synthesis of N-methylmorpholine-N-oxide (NMMO), a reaction known to be hazardous. First, a reaction calorimeter (SIMULAR) was used to investigate the exothermic behavior of the reaction in the semi-batch operation.
Jiancun Gao, Chenguang Shi, Sisi Liu, Shengnan Wang, Wei Wang   +4 more
openaire   +1 more source

Biodegradation of N-Methylmorpholine-N-oxide

Biodegradation, 1998
N-Methylmorpholine-N-oxide (NMMO) is capable of dissolving cellulose without any further addition of chemicals. The solution can be used to produce cellulosic staple fibres by pressing it through spinning jets into an aqueous spinning bath. Because of results from conventional biodegradation tests using non-adapted activated sludge, the solvent is ...
G, Meister, M, Wechsler
openaire   +2 more sources

N-Methylmorpholine-N-oxide (NMMO): hazards in practice and pitfalls in theory

Cellulose, 2021
The hazards of handling N-methylmorpholine-N-oxide (NMMO) cannot be described often enough, although it is a rather common (co-)solvent for cellulose. Inaccuracies in the literature regarding the chemistry of NMMO, such as its role in solvent systems and in redox systems involving transition metal ions, increase the risk of dangerous failure of the ...
Thomas Rosenau, Alfred D. French
openaire   +1 more source

Cellulose organic solvents. I. The structures of anhydrous N-methylmorpholine N-oxide and N-methylmorpholine N-oxide monohydrate

Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 1981
International ...
Maia, E., Peguy, A., Perez, S.
openaire   +1 more source

Heterogeneity in the system cellulose-N-methylmorpholine-N-oxide

Fibre Chemistry, 1987
Data obtained by the turbidity spectrum method indicate a comparatively high heterogeneity of cellulose solutions in N-methylmorpholine-N-oxide monohydrate. The particle size of the disperse phase depends on the temperature-time regime of solution preparation.
V. N. Smirnova, Yu. Ya. Belousov, M. M. Iovleva   +2 more
openaire   +1 more source

Responsive and patterned cellulose nanocrystal films modified by N-methylmorpholine-N-oxide

Carbohydrate Polymers, 2020
A type of cellulose solvent, i.e., aqueous N-methylmorpholine- N-O xide (NMMO) solutions, was used to modify cellulose nanocrystal (CNC) photonic films. CNC films can be swollen by NMMO, resulting in red-shifted reflected colors. The swelling effect is supposed to come from NMMO permeation into the crystalline regions of individual CNCs and ...
Yu Zhang, Zhongjian Tian, Yingjuan Fu, Zhaojiang Wang, Menghua Qin, Zaiwu Yuan   +5 more
openaire   +2 more sources

Structural transformations in the N-methylmorpholine N-oxide-water system

Fibre Chemistry, 1997
The structural and phase transitions in formation of anhydrous MMO during vacuum drying of DH-MMO and MH-MMO were investigated. The characteristics of the structural changes in MH-MMO in repeated processing of the sample in a heating-cooling regime were determined.
L. K. Kuznetsova, L. K. Golova, G. Ya. Rudinskaya, T. A. Lyubova, N. V. Vasil'eva, O. E. Borodina   +5 more
openaire   +1 more source

Rheological properties of concentrated cellulose solutions in N-methylmorpholine-N-oxide

Fibre Chemistry, 1990
-- Rheological properties of concentrated solutions of cellulose in N-mcthylmorpholine-N-oxide on varying the concentration of cellulose in the solution from 10 to 28% by wt. have been studied. -- It has been found that on increasing the cellulose content of the solution, the viscoelastic properties of the solution qualitatively change.
L. P. Braverman, V. V. Romanov, O. B. Lunina, T. P. Belasheva, G. G. Finger   +4 more
openaire   +1 more source