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首页> 外文期刊>Journal of Applied Polymer Science >Inter-Relationship Between Processing Conditions and Mechanical Properties of Blown Film from Different Polypropylenes and High Melt Strength Polypropylene Blends
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Inter-Relationship Between Processing Conditions and Mechanical Properties of Blown Film from Different Polypropylenes and High Melt Strength Polypropylene Blends

机译：不同聚丙烯和高熔体强度聚丙烯共混物吹塑薄膜的加工条件与机械性能之间的相互关系

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摘要

The aim of this study is the improvement of process stability and film properties of various matrix polymers by the addition of long chain branched (LCB) polypropylene (PP) in the blown film process. Three commercially available PP grades were dry-blended with two different high melt strength (HMS) PP grades with varying weight content in the range of 5, 10, and 20%. Maximum solid output was determined on a Hosokawa blown film line with a film thickness of 50 pm. Thickness was adjusted by proper relation between output and take-up ratio (TUR). The blow-up ratio (BUR) was varied from 1 : 2 to 1 : 3 and 1 : 4 in connection to the output rate and HMS-PP content. Research showed an increase of the output due to the additon of HMS-PP in various matrix polymers and different processing conditions. Influences on mechanical properties related to process parameters concerning stiffness and impact energy were found. Due to the addition of HMS-PP in a heterophasic PP-copolymer (PP-I) the maximum solid output increases up to 50% as well as tensile properties were enhanced. Stiffness of the blown film is independent of the output and the BUR both in machine direction (MD) and transverse direction (TD). In contrast a reduction of the process stability and solid state properties were determined with homo-PP (PP-H) and random-PP (PP-R) mixtures. Decreasing impact energy of the heterophasic copolymer was determined with increasing HMS-PP content. In comparison to the enhanced stiffness, toughness decreases which refers to a higher brittleness due to the addition of HMS-PP.
机译：这项研究的目的是通过在吹膜工艺中添加长支链（LCB）聚丙烯（PP）来改善各种基质聚合物的工艺稳定性和膜性能。将三种市售PP等级与两种不同的高熔体强度（HMS）PP等级进行干混，其重量含量在5％，10％和20％的范围内变化。在Hosokawa吹膜生产线上测定最大固体产量，膜厚为50 pm。通过输出量与卷取比（TUR）之间的适当关系来调整厚度。结合输出速率和HMS-PP含量，吹胀比（BUR）从1：2至1：3和1：4变化。研究表明，由于在各种基质聚合物和不同加工条件下添加了HMS-PP，产量有所增加。发现了与涉及刚性和冲击能的工艺参数有关的机械性能的影响。由于在多相PP共聚物（PP-I）中添加了HMS-PP，最大固体产量增加了50％，并且拉伸性能得到了提高。吹膜的刚度在纵向（MD）和横向（TD）上均与输出和BUR无关。相反，用均聚PP（PP-H）和无规PP（PP-R）混合物确定了工艺稳定性和固态性能的降低。随着HMS-PP含量的增加，确定了多相共聚物的冲击能降低。与增加的刚度相比，韧性降低，这是由于添加了HMS-PP而导致的较高的脆性。

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