N-Methylmorpholine was synthesized by alkylation of morpholine with chloromethane in sodium hydroxide solution. The influences of reaction temperature, reaction time and molar ratio of reactants on the yield of the re...N-Methylmorpholine was synthesized by alkylation of morpholine with chloromethane in sodium hydroxide solution. The influences of reaction temperature, reaction time and molar ratio of reactants on the yield of the reaction were examined. The optimum reaction conditions are as follows: reaction temperature 35 ℃, time 5 h, n(morpholine)∶n(monochloromethane)=1∶1.1, n(morpholine)∶n(sodium hydroxide)= 1∶1.2, yield of N-methylmorpholine 85%, purity 98%.展开更多
Rheology properties of cellulose/NMMO/water solution are important parameters for spinning. The storage and loss modulus and viscosity of the solution decrease with increasing water concentration of solvent in certain...Rheology properties of cellulose/NMMO/water solution are important parameters for spinning. The storage and loss modulus and viscosity of the solution decrease with increasing water concentration of solvent in certain range. Flow-activation energy of two kinds of cellulose solution is quite different in view of their molecular weight. The molecular weigh distribution of cellulose samples can be characterized by the value of Gc/c Since the different cellulose samples have different MWD and DP, the relations of the first normal stress difference N1 vs. shear rate are different. Moreover, the rheology properties of cellulose solution produced by twin-screw extruder process are also investigated.展开更多
文摘N-Methylmorpholine was synthesized by alkylation of morpholine with chloromethane in sodium hydroxide solution. The influences of reaction temperature, reaction time and molar ratio of reactants on the yield of the reaction were examined. The optimum reaction conditions are as follows: reaction temperature 35 ℃, time 5 h, n(morpholine)∶n(monochloromethane)=1∶1.1, n(morpholine)∶n(sodium hydroxide)= 1∶1.2, yield of N-methylmorpholine 85%, purity 98%.
文摘Rheology properties of cellulose/NMMO/water solution are important parameters for spinning. The storage and loss modulus and viscosity of the solution decrease with increasing water concentration of solvent in certain range. Flow-activation energy of two kinds of cellulose solution is quite different in view of their molecular weight. The molecular weigh distribution of cellulose samples can be characterized by the value of Gc/c Since the different cellulose samples have different MWD and DP, the relations of the first normal stress difference N1 vs. shear rate are different. Moreover, the rheology properties of cellulose solution produced by twin-screw extruder process are also investigated.
