摘要
使用毛细管流变仪对常规 PA N的 N a SCN溶液 (浓度为 12 .8% )的流变性能进行了研究。剪切速率 (γ)的对数与校正表观粘度η校 和孔口胀大比 (B)都呈线性关系 ,η和 B在毛细管中都表现出松弛的特征。粘流活化能 (Eη)随着毛细管长径比 (L /D )增加 ,先是下降很快 ,然后逐渐变缓 ,最后趋向平衡 ;随着γ的对数的增加 ,Eη线性下降。孔口胀大活化能 (EB)随γ和 L /D的变化规律与 Eη的类似 ,但它随着γ增加而增大 。
The rheological properties of PAN\|NaSCN aqueous solution were studied with a Capillary\|Rheometer. The relations between the logarithm of shear rate() and the logarithm of calibrated apparent viscosity (η ) as well as the logarithm of dieswell ratio (B) are linear. The η and the B both show relaxation character during solution flows in the capillary. When the ratio of length to diameter of capillary (L/D) increases, E η first goes down quickly, then decreases slowly little by little, at last, it reaches equilibrium. The relationship between B's activation energy (E B) and or L/D is similar to that of E η, but it increases with , and the value of E B is smaller than E η.
出处
《合成纤维工业》
CAS
CSCD
2000年第3期15-19,共5页
China Synthetic Fiber Industry
关键词
高聚物
腈纶纺丝溶液
流变性
硫氰酸钠法
polyacrylonitrile fiber
rheological property
apparent viscosity
dieswell
activation energy
