在自行设计的恒速型毛细管动态流变装置上 ,对聚合物熔体进行动态挤出实验。借助已建立的振动力场下聚合物熔体流变行为的表征公式 ,分别计算振动力场下聚合物熔体在毛细管壁处的剪切应力、剪切速率和表观粘度。与稳态挤出时相比 ,引入振动力场后 ,发现毛细管压力降、表观粘度均显著降低 ,且随着振动频率和振幅的改变呈非线性变化趋势 ,作者对此进行了深入分析。 In a self-designed constant speed capillary dynamic rheological device, the polymer melt dynamic extrusion experiment. The established shear stress, shear rate and apparent viscosity of the polymer melt at the capillary wall were calculated respectively by the characterization formulas of the rheological behavior of the polymer melt under the vibration force field. Compared with the steady-state extrusion, the capillary pressure drop and apparent viscosity were significantly decreased after the introduction of the vibration force field, and the nonlinear variation trend of the capillary frequency and amplitude showed a nonlinear trend. The author conducted an in-depth analysis.