【摘要】 利用聚合物熔体的双折射性质,对振动力场作用下窄缝挤出模头中的聚合物熔体脉动挤出行为进行光散射研究,用光弹性图像和光强度矩阵来表征聚合物熔体受到的剪切应力。振动力场的引入使光弹性图像和光强度矩阵发生了规律性变化。结果表明,振动力场使聚合物熔体剪切应力减小、表观粘度降低,最终使得挤出压力降低、产量提高。更多还原

【Abstract】 Polymer melts have the quality of double refraction. So the method of light scattering was used to research the behavior of polymer melts flowing in the slit die in vibration force field, and the shearing stress of polymer melts is characterized by photoelastic pattern and light intensity matrix. Vibration field can make the photoelastic pattern and light intensity matrix change regularly. The result shows that vibration field can decrease the shearing stress and apparent viscosity of polymer melts, so the extrusion pressure is cut down and the yield is increased finally.更多还原