摘要
在捏合机中制备纤维素在磷酸/多聚磷酸复合溶剂中的液晶溶液。利用显微镜观察边界层移动,测定凝固速度,研究凝固剂性质、凝固浴温度、溶液中纤维素含量对凝固速度的影响。实验结果表明:凝固剂的分子体积和结构对凝固速度有重要的影响,对于乙醇、正丙醇、异丙醇这3种一元醇其凝固速度随分子体积的增大而减小;温度与凝固速度之间存在Arrhenius式的关系,凝固速度随凝固浴温度的升高而增大,凝固活化能的排序为乙醇<正丙醇<异丙醇;凝固速度随溶液中纤维素含量的增大而减小。在此基础上分析凝固变量对凝固过程的影响。
Liquid crystalline solutions of cellulose in phosphoric acid/poly-phosphoric acid compound solvent were prepared in a kneader.The coagulation rate was measured based on microscopic observation of the moving boundary associated with coagulation.The effect of the nature of the coagulant,temperature of coagulation bath,and cellulose concentration on the coagulation rate was studied.The results show that the molecular size and molecular structure of the coagulant play an important role in determining the rate of coagulation,coagulation rate decreases with increasing molecular volume for the three monohydric alcohols,ethanol,1-propanol and 2-propanol;an Arrhenius-type relationship exist between the coagulation rate and temperature,coagulation rate increases with increasing the temperature of coagulation bath,the activation energy for coagulation increases in the order ethanol〈1-propanol〈2-propanol;coagulation rate decreases with increasing cellulose concentration in the solution.Based on these studies,the effect of coagulation variables on coagulation process was depicted.
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2008年第9期1-4,共4页
Journal of Textile Research
关键词
纤维素
磷酸/多聚磷酸
液晶溶液
凝固速度
凝固剂
cellulose
phosphoric acid/poly-phosphoric acid
liquid crystalline solutions
coagulation rate
coagulant
