The influences of temperature, content of foaming agent and CaCO3 on the extrudate swell, and average cell diameter of polypropylene foam are investigated using improved capillary rheometer.

• 利用改进后的毛细管流变仪研究了温度、发泡剂与碳酸钙含量对聚丙烯发泡体系挤出胀大和泡孔直径的影响。