高分子量微生物纤维素LiCl/DMAc纺丝溶液流变性研究  

Rheological property of solutions of high molecular weight bacterial cellulose in LiCl/N,N-dimethylacetamide

作　　者：张秀超[1] 张丽改 代永强[1] 唐卫华[2] 金日光[1] 

机构地区：[1]北京化工大学,北京100029 [2]南京理工大学,南京210000

出　　处：《化工新型材料》2014年第10期140-142,共3页New Chemical Materials

摘　　要：微生物纤维素溶液流变性能对其纺丝工艺研究具有重要的指导意义,以8%LiCl/DMAc为溶剂采用旋转流变仪对不同分子量、不同固含量溶液的稳态流变及动态流变进行了测定。结果表明:微生物纤维素的LiCl/DMAc溶液属于非牛顿假塑性流体;高分子量的溶液比低分子量的溶液黏度要高;随温度的升高,溶液表观黏度不断下降,高浓度的溶液在低剪切速率下对温度更敏感,且浓度越高,结构黏度指数越大,纺丝难度越大。通过动态流变得知,溶液浓度越高,体系弹性强度及黏滞力越大,但对外部剪切力越敏感,其物理稳定性越弱。The rheological properties of bacterial cellulose solution has great significance to the studies of the spin- ning process. Bacterial cellulose was dissolved in 8% LiCI/N,N dimethylacetamide, the steady and dynamic rheological properties of the different weights and different solid contents solutions were investigated by means of rotational rheome- ter. The results showed that the bacterial cellulose solution was a typical non-Newtonian pseudoplastic fluid. High molecular weight solution had higher viscosity than the low. With increasing of temperature,the viscosity of solution decreased,solu- tion, a high concentration of solution under low shear rate was more sensitive to temperature, and concentration was higher. The greater the structure viscosity index, the more difficult the spinning. Through dynamic rheology, the higher solution concentration,the greater of the intensity and viscous force of the system, the more sensitive to sheer force, the weaker of the physical stability.

关 键 词：微生物纤维素 稳态流变 动态流变 

分 类 号：TQ340.64[化学工程—化纤工业]