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The Effect of Orientation on Extrusion Cast Metallocene Polyethylenes and the Role of Processing Conditions in the Die Swell of Metallocene and Conventional Polyethylenes

机译:取向对挤铸茂金属聚乙烯的影响以及加工条件在茂金属和常规聚乙烯的模头膨胀中的作用

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Cast films were prepared from a range of metallocene polyethylenes (mPEs) of varied co-monomer types (hexene, octene) using a Killion single-screw extruder, using different haul off speeds (8-4 m/min) and die gaps (700-250 μm). Samples with greater orientation in one direction had increased tensile strength and shrinkage in that direction. DSC analysis showed crystallinity to decrease with decreasing haul off speed. Extrusion of mPEs and conventional linear low density polyethylenes (LLDPEs) by single capillary rheology showed that die swell increased with increasing extrusion rate and decreasing melt temperature. Increased die swell was found for the broader molecular weight distribution (M.W.D.) LLDPEs and in the higher molecular weight resins. Furthermore, long chain branching was found to increase die swell.
机译:使用Killion单螺杆挤出机,使用不同的牵引速度(8-4 m / min)和模头间隙(700),由一系列不同共聚单体类型(己烯,辛烯)的茂金属聚乙烯(mPE)制备流延膜。 -250μm)。在一个方向上具有更大定向的样品在该方向上具有增加的拉伸强度和收缩率。 DSC分析显示结晶度随着拖拉速度的降低而降低。 mPE和常规线性低密度聚乙烯(LLDPE)的单毛细管流变挤出表明,模头溶胀随挤出速率的增加和熔体温度的降低而增加。发现较宽的分子量分布(M.W.D.)LLDPE和较高分子量的树脂的模头膨胀增加。此外,发现长链支化增加了模头膨胀。

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