Rheological behavior of nanolayered films of polyethylene/polyamide 6 (PE/PA6) compatibilized in situ during the coextrusion process has been studied at a temperature between the melting temperatures of PE and PA6. Thanks to the high number of interfaces, a drastic increase in dynamic moduli has been measured when increasing the interphase volume fraction in the films, and a solid-like behavior for the interphase was identified. Different models are compared to capture the complex viscosity of nanolayered films as a function of angular frequency. A model considering interphase and bulk viscosities and a single fitting parameter, namely, the thickness over which the viscosity decreases linearly from the interphase to the bulk one, captures the complex viscosity of all samples. This thickness is comparable to the PE layer thickness up to values about 1 μm before a significant bulk region has to be added to capture the behavior for thicker layers. This suggests that the melt rheology is impacted by the presence of a nanometric interphase over very large (micronic) length scales.

中文翻译：

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存在相容界面时多层薄膜流变特性的建模

已经研究了在聚乙烯/聚酰胺 6 (PE/PA6) 共挤出过程中原位相容的纳米层薄膜在 PE 和 PA6 熔融温度之间的温度下的流变行为。由于大量的界面，当增加薄膜中的界面体积分数时，动态模量的急剧增加被测量到，并且界面的类似固体的行为被确定。比较不同的模型以捕获作为角频率函数的纳米层膜的复粘度。考虑界面和体积粘度以及单个拟合参数的模型，即粘度从界面到体积线性降低的厚度，捕获所有样品的复数粘度。该厚度可与 PE 层的厚度相媲美，最高可达约 1 μm 的值，然后必须添加显着的体区以捕获更厚层的行为。这表明熔体流变性受到非常大（微米）长度尺度上纳米界面相的影响。