This paper studied rheological behaviour of low density polyethylene (LDPE),linear low density polyethylene (LLDPE) and the blends thereof by double-capillary rheometer in a wide flowrate range.

• 用双毛细管流变仪研究了线型低密度聚乙烯、低密度聚乙烯及其共混物在较宽速率范围内的流变行为,通过分析流场中应力集中效应与不稳定流动的关系,从而控制不稳定流动现象。