This paper is dealing with the polyisobutylene (PIB) migration phenomenon through the post-consumer agricultural waste multilayer films based on four linear low-density polyethylene (LLDPE) matrices. Through this work, a bridge between shear, elongational rheology, and tack surface properties was revealed on both model and recycled blends. Hereto, effects of aging time and temperature were investigated and rationalized depending on the short- and long-chain branching in LLDPE matrices as well their polyethylene (PE) crystallization. The linear viscoelastic properties were influenced despite the small PIB amounts. This migration influenced also the slippage in steady flow regime. It was also demonstrated that transient uniaxial extensional properties are very sensitive in the presence of PIB, which seems to hold back the PE strain hardening properties. Therefore, the axial force and the surface friction coefficient were determined and discussed in correlation with bulk rheological findings. Hence, the obtained results contributed to unveiling new insights on the physical mechanisms governing the PIB migration with or without fillers to inhibit its migration in their recycled films.

中文翻译：

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本体流变学和表面摩擦流变学研究聚异丁烯在模型和再生多层农膜中的迁移

本文通过基于四种线性低密度聚乙烯 (LLDPE) 基质的消费后农业废弃物多层薄膜处理聚异丁烯 (PIB) 迁移现象。通过这项工作，在模型和再生共混物上揭示了剪切、伸长流变和粘性表面特性之间的桥梁。因此，根据 LLDPE 基质中的短链和长链支化以及它们的聚乙烯 (PE) 结晶，研究并合理化了老化时间和温度的影响。尽管 PIB 量很小，但线性粘弹性仍受到影响。这种迁移也影响了稳定流动状态的滑移。还证明了在 PIB 存在下瞬态单轴拉伸特性非常敏感，这似乎阻碍了 PE 应变硬化性能。因此，确定轴向力和表面摩擦系数，并结合体积流变学发现进行讨论。因此，所获得的结果有助于揭示控制 PIB 迁移的物理机制的新见解，无论是否有填料，以抑制其在其回收薄膜中的迁移。