【摘要】 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。更多还原

【Abstract】 Dynamic extrusion experiments for polymer melts were done on the invariable speed type capillary dynamic rheometer (ISTCDR) made by the author. Based on the representative equations for rheological behavior of polymer melt under the built-up vibration force field,the shear stress,shear rates and apparent viscosity at the wall of capillary were calculated. Compared with steady extrusion, after introducing vibration force field, capillary pressure drop, melt apparent viscosity decreased obviously, which showed decreasing tendency in nonlinear with vibration frequency and amplitude increasing.更多还原