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中文摘要：
通过改变含氟弹性体（PPA）的含量，研究了PPA对线型低密度聚乙烯（LLDPE）熔体流变行为的影响。研究发现，将PPA加入到LLDPE中，熔体的挤出压力、挤出胀大比均减小，发生鲨鱼皮畸变和挤出压力振荡等不稳定流动现象时的临界剪切速率提高，扩大了加工范围；足量的PPA甚至可完全消除鲨鱼皮畸变现象。
英文摘要：
The paper studied the effect of fluorinated elastomer（PPA）, a kind of vinylidene fluoride-hexafluoropropylene -tetrafluoroethylene terpolymer, on rheological behavior of linear low density polyethylene （LLDPE） melt by changing content of PPA. The research discovers that adding PPA can reduce extrusion pressure and the extrusion swelling ratio of the melt, and especially can increase critical shearing rate without aggravating the unstable flow phenomena, involving sharkskin distortion and the extrusion pressure oscillation. These advantages make the processing scope of LLDPE be expanded. In the case of adding sufficient dosage of PPA, the sharkskin distortion even can be eliminated completely.
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