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首页> 外文期刊>Journal of Applied Polymer Science >Investigation of the Migration Behavior of Polyisobutylene with Various Molecular Weights in Ethylene/α-Olefin Copolymer Blown Stretch Films for Improved Cling Properties
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Investigation of the Migration Behavior of Polyisobutylene with Various Molecular Weights in Ethylene/α-Olefin Copolymer Blown Stretch Films for Improved Cling Properties

机译：不同分子量的聚异丁烯在乙烯/α-烯烃共聚物吹塑拉伸膜中的迁移行为的研究

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摘要

High retention forces are the basic requirements on stretch films for agricultural or pallet wrapping of goods and significantly influenced by cling properties (autohesion) that are essential for a reliable load stability during transportation and storage. Low molecular weight polyisobutylene (PIB) has tacky properties and is immiscible with polyethylene. Blended with ethylene/α-olefin copolymers in coextruded stretch films, PIB can migrate to the film surfaces and cause cling properties. Cling and adhesion forces were investigated using the mechanical cling test, atomic force, and scanning electron microscopy and infrared spectroscopy. The molecular weight of the PIB as well as density and crystallinity of the matrix material have strong influences on migration kinetics and therefore, on the cling forces. Cling forces increase with increasing aging time, having a maximum after 2 weeks of production. The following slight decrease of the cling force might be correlated with a beginning degradation process of the UV sensitive PIB. Polyisobutylene with higher molecular weight diffuses slower through a linear low density polyethylene (LLDPE) matrix than lower molecular weight PIB, but can cause higher cling forces on the film surfaces.
机译：高保持力是用于农用或托盘包装货物的拉伸膜的基本要求，并且受附着性能（自粘）的影响很大，对于在运输和存储过程中可靠的负载稳定性至关重要。低分子量聚异丁烯（PIB）具有粘性，并且不能与聚乙烯混溶。在共挤出拉伸膜中与乙烯/α-烯烃共聚物共混时，PIB可以迁移到膜表面并引起粘着性能。使用机械粘合试验，原子力，扫描电子显微镜和红外光谱研究了粘合力和粘附力。 PIB的分子量以及基质材料的密度和结晶度对迁移动力学有很大影响，因此对粘着力也有很大影响。紧贴力随老化时间的增加而增加，在生产2周后达到最大。随后紧贴力的轻微降低可能与UV敏感PIB的降解开始有关。分子量较高的聚异丁烯通过线性低密度聚乙烯（LLDPE）基质的扩散要比分子量较低的PIB慢，但会在膜表面产生较高的粘着力。

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