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采用气压式毛细管流变仪 ,测定了实验室自制丙烯腈 -酪素接枝共聚物 (AN- g- casein)浓溶液的流变性能。实验结果发现 :AN- g- casein浓溶液属切力变稀型非牛顿流体 ;在实验范围内 ,毛细管流动中的末端校正系数 e随切变速率的提高而增大 ,当切变速率较高时 ,AN- g- casein大分子在浓溶液中形成了束状物 ,拉伸变形受到了限制 ,e值上升趋于极限 ;当切变速率较高 ,毛细管长径比较小时 ,真实剪切应力仅占表观剪切应力的 35%左右 ,证明了毛细管流动末端校正的必要性。
Rheological properties of laboratory-made concentrated acrylonitrile-casein concentrates were determined using a pneumatic capillary rheometer. The experimental results show that the concentrated solution of AN-g-casein is a shear-thinning non-Newtonian fluid. Within the experimental range, the end-point correction coefficient e in the capillary flow increases with the increase of shear rate. When the shear rate is high When AN-g-casein macromolecules form a bundle in concentrated solution, the tensile deformation is limited and the e value rises to the limit. When the shear rate is high and the capillary length is small, the true shear stress Accounting for only about 35% of the apparent shear stress, demonstrating the need for capillary flow tip correction.