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中文摘要：
采用恒速型双毛细管流变仪研究了2种牌号为ELITE5500G，ELITE5100G（以下分别简称牌号A，B）茂金属催化线型低密度聚乙烯（m-LLDPE）的高速挤出流变行为。研究结果表明，牌号A的粘流活化能高于牌号B的；牌号B的人口压力降、熔点以及结晶度大于牌号A的；当达到临界剪切速率时，2种m-LLDPE都出现压力振荡和流动曲线的断裂现象，且牌号A振荡更强；在不同剪切速率下牌号A挤出物表观质量优于牌号B的，并且在高剪切速率下出现第2光滑挤出现象，牌号B没有出现第2光滑区。
英文摘要：
The rheological behavior of two kinds of m-LLDPE（grade A,grade B） at high speed extrusion was typically concerned and systematically studied through a double-capillary rheometer working under constant speed. The results suggest that the flow activation energy of grade A is larger than that of grade B. The pressure P2 （right die）/P1 （left die）,melting piont and crystallinity of grade B are higher than those of grade A. At the critical shear rate the extrusion pressure oscillation of two kinds of m-LLDPE occurs along with a broken flow curves, and grade A is more obvious. With different shear rates, the apparent quality of grade A is better than that of grade B. The second smooth section occurs in grade A while grade B does not exhibit this interesting phenomenon .
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