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中文摘要：
采用恒速型双毛细管流变仪研究了含氟弹性体（PPA）对茂金属催化线性低密度聚乙烯（m-LLDPE）熔体高速挤出不稳定行为的影响。结果表明，微量PPA的加入能推迟甚至抑制鲨鱼皮畸变，能明显改善粘一滑畸变。加入微量PPA后，挤出压力下降，管壁上应力集中效应减弱，挤出压力振荡现象减弱甚至消失，流动曲线由断裂逐渐变得连续。
英文摘要：
The effect of PPA on the rheology of metalloeene linear low density polyethylene （m-LLDPE） at high speed extrusion was studied through a double-capillary rheometer working under constant speed. The results show that trace PPA can delay, even inhibit the occurrences of sharkskin, and improve the stick-slip distortion. When trace PPA is added into m-LLDPE, expression pressure decreases, effect of stress concentration on the wall decreases, extrusion pressure oscillation weakens and even disappeares, the fracture flow curves beeome continuous gradually.
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