纤维素氨基甲酸酯溶液黏度与其结构及组成的关系

Relationship of viscocity with structure and composition of cellulose carbamate solution

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 viscocity of cellulose carbamate solution were studied. The results showed that CC of nitrogen contents higher 2.0 % can be dissolved in sodium hydroxide solution of 9 % to 11% at temperatures of - 7 - - 3℃form CC solution of below 8.5 %. The viscocity of CC solution increased as the polymer, contents of N,temperature of impregnant, concentration of CC increased and decreased as the amount of sodium hydroxide increased and the addition of carbamide. In addition, conserving temperature and time also have huge influence on the viscocity of CC solution. The viscocity of CC decreased with increase of temperature in low temperature. However, when the temperature is higher 15 ℃, the viscocity of CC increased with increase of temperature. During beginning 8 hours, the viscoeity of CC decreased with increase of conserving time, then the viscocity of cellulose earbamate began to increase and gelation occurred.