Results 151 to 160 of about 2,536 (191)
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3D bioprinting of cellulose with controlled porous structures from NMMO
Materials Letters, 2018Abstract In the present work, dissolved cellulose has been 3D bioprinted to produce complex structures with ordered interconnected pores. The process consists of the dissolution of dissolving pulps in N-methylmorpholine-N-oxide (NMMO), multilayered dispensing, water removal of NMMO and freeze-drying. 3D bioprinting of cellulose/NMMO solution at 70 °C
Lei Li
exaly +2 more sources
BAMO/NMMO Copolymer with Polyester Initiation
Propellants, Explosives, Pyrotechnics, 1997AbstractIn order to improve of mechanical properties at low temperature region, 3,3‐bis(azidomethyl)oxetan (BAMO), 3‐nitratomethyl‐3‐methyloxetane (NMMO) and polyester (PE) copolymer were synthesized by using polyester initiator with boron trifluoride etherate.
Hidetoshi Kawasaki +3 more
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Phase diagram of the ternary system NMMO/water/cellulose
Cellulose, 2009The phase diagram of the system N-methylmorpholine-N-oxide(NMMO)/H2O/cellulose has been measured at 80 °C by establishing a solubility map (observation of the mixtures under the microscope), by the analysis of coexisting phases and determining the critical point.
Herbert Sixta, Bernhard A Wolf
exaly +2 more sources
Kinetics of Precipitation of Cellulose from Cellulose−NMMO−Water Solutions
Biomacromolecules, 2005The regeneration of a solid, crystallized cellulose solution in a N-methylmorpholine-N-oxide (NMMO)-water mixture was studied by measuring the diffusion coefficient of both the water uptake from the regenerating bath and the NMMO outflow to this bath. The diffusion coefficient of water going to the cellulose solution is about 10 times larger than the ...
Biganska, Olga, Navard, Patrick
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Thermodynamic Interaction Parameters for the System Water/NMMO Hydrate
The Journal of Physical Chemistry B, 2008Vapor pressures of water were measured for aqueous solutions of N-methyl-morpholine N-oxide (NMMO) at 80, 90 and 100 degrees C. The Flory-Huggins interaction parameters, chi, calculated from these data as a function of phi, the volume fraction of NMMO, are negative at all concentrations; at low phi, they decrease by more than a factor of 2 as T is ...
John, Eckelt, Bernhard A, Wolf
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Oxidation and structural changes in NMMO-regenerated cellulose films
Cellulose, 2016Carbonyl and carboxyl groups introduced by oxidative processes during production and purification of celluloses determine intra- and intermolecular interactions and thus application-related bulk and surface properties of cellulosic materials. We report a comprehensive approach to the quantification of carboxyl and carbonyl groups in cellulose films ...
Ralf Zimmermann +6 more
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N-Methylmorpholine-N-oxide (NMMO): hazards in practice and pitfalls in theory
Cellulose, 2021The 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
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Preparation of the Reed Cellulose Membrane by Using NMMO Method
Advanced Materials Research, 2012The reed cellulose was extracted from the wild reed in the hot 12% sodium hydroxide (NaOH) aqueous solution. Then, the cellulose membrane was successfully prepared by using the reed cellulose as the raw materials dissolved in the solvent of N-methylmorpholine-N-oxide (NMMO).
Mei Ling Pan +3 more
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Structure formation of regenerated cellulose materials from NMMO-solutions
Progress in Polymer Science, 2001Cellulose as the most abundant regrowing organic material exhibits outstanding properties and useful applications, but also a tremendous challenge with regard to an economical and environmentally friendly chemical processing. In recent years the N-methylmorpholine-N-oxide (NMMO)-technology turned out to be a simple physical alternative to the yet ...
H.-P Fink, P Weigel, H.J Purz, J Ganster
exaly +2 more sources
Insensitive munitions and combustion characteristics of BAMO/NMMO propellants
Journal of Energetic Materials, 1996Abstract Burning characteristics and sensitivities to the ballistic shock were investigated for BAMO/NMMO composite propellants oxidized with HMX, AP, and AN. Tests of card gap, fragment impact (FI), electrostatic discharge (ESD), and bullet impact were conducted to evaluate their sensitivities.
Eishu Kimura, Yoshio Oyumi
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