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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 microbial cellulose solution have important guiding significance for the spinning process research. The steady-state rheological and dynamic rheology of solution with different molecular weight and different solid content were obtained by using the rotating rheometer with 8% LiCl / DMAc as solvent The determination. The results showed that LiCl / DMAc solution of microbial cellulose belonged to non-Newtonian pseudoplastic fluid. The viscosity of high molecular weight solution was higher than that of low molecular weight solution. With the increase of temperature, the apparent viscosity of solution decreased continuously. The shear rate is more sensitive to temperature, and the higher the concentration, the greater the structural viscosity index, the greater the difficulty of spinning. By dynamic flow, the higher the solution concentration, the greater the elastic and viscous forces of the system, but the more sensitive to the external shear force, the weaker the physical stability.