超声振动对PS熔体流变及黏弹行为的影响

Effect of Ultrasonic Vibration on the Viscoelastic and Rheological Behaviors of Polystyrene Melt

采用Bagley入口校正等理论计算方法与实验结果相结合 ,讨论了超声振动对PS熔体流变及黏弹行为的影响。在口模入口处施加超声振动 ,降低了聚合物熔体的非牛顿性 ,改变其黏弹行为 ,使其在毛细管口模中流动时弹性形变及储能减小 ,形变松弛加快 ,黏度降低 ,从而使挤出加工中流动阻力变小 ,挤出效率得到提高。

The effect of ultrasonic vibration on the viscoelastic and rheological behaviors of polymer melt based on the entrance calibration was discussed. When the ultrasonic vibration was carried out at the entrance, the recoverable shear strain, the shear stress at the wall of the die, the first normal stress and the relaxation time of the polymer melt were decreased. Consequently the hydraulic resistance of the shaping heads was reduced and the capacity of extrusion was increased.