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探讨了纤维素氨基甲酸酯(CC)溶液黏度的影响因素。结果表明:含氮量大于2.0%的干态CC能很好地溶解在-7~-3℃的质量分数为9%~11%的氢氧化钠溶液中,形成质量分数小于8.5%的CC的氢氧化钠溶液。在研究范围内,CC溶液黏度随聚合度、含氮量、溶剂温度及溶液中CC的质量分数的提高而增加,随溶剂中碱量的增加及助溶剂———尿素的添加而降低;另外,溶液存放温度及存放时间对CC溶液黏度也有显著影响:低温时,溶液黏度随温度升高而下降,高于15℃后,溶液黏度随温度升高而上升;起初的8 h内,溶液黏度随存放时间延长而下降,之后,溶液黏度又开始回升,出现凝胶化现象。
The influencing factors of the viscosity of cellulose carbamate (CC) solution were discussed. The results showed that CC with nitrogen content greater than 2.0% can dissolve well in sodium hydroxide solution with mass fraction of 9% ~ 11% at -7 ~ -3 ℃ to form CC with mass fraction less than 8.5% Sodium hydroxide solution. Within the scope of the study, the viscosity of CC solution increased with the increase of polymerization degree, nitrogen content, solvent temperature and mass fraction of CC in solution, but decreased with the increase of alkali content in solvent and the addition of cosolvent --- urea. , Solution storage temperature and storage time also have a significant impact on the viscosity of CC solution: low temperature, the solution viscosity decreases with increasing temperature above 15 ℃, the solution viscosity increases with increasing temperature; within the first 8 h, solution viscosity With the extension of the storage time and decreased, after the solution viscosity began to rise, the phenomenon of gelation.