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采用气压式毛细管流变仪 ,测定了丙烯腈 -酪素接枝共聚物 (AN- g- casein)浓溶液的流变性能。求得了适合高剪切速率的弹性模量 (G) ,发现 G随剪切速率的增加而升高 ,纠正了早原 (由于在高剪切速率下仍采用同一个入口校正所造成 )的相反结论 ;定量地求得了表观弹性活化能 (Ee) ;在高剪切速率下 ,可复弹性形变较之表观粘度对于温度的变化更敏感 ,是引起孔口膨化的主要原因。采用本方法 ,可估算纺丝过程的膨化比 ,再由此选择实际喷丝头的拉伸比 ,对于湿纺工艺的稳定 ,提供了理论依据。
Rheological properties of acrylonitrile-casein concentrated solutions were determined using a pneumatic capillary rheometer. A modulus of elasticity (G) suitable for high shear rates was found, and G was found to increase with increasing shear rate, correcting the reversal of the early protoplasm (due to the same inlet correction at high shear rates) Conclusions; The apparent elastic activation energy (Ee) was obtained quantitatively. Under high shear rate, the re-elastic deformation is more sensitive to the change of temperature than the apparent viscosity, which is the main cause of puffing. Using this method, the puffing ratio of the spinning process can be estimated, and then the draw ratio of the actual spinneret can be selected to provide a theoretical basis for the stability of the wet spinning process.