The goal of this study was to find a way to apply existing constitutive viscoelastic models on ternary polymer blends forming core-shell morphology. An attempt was also made to quantify the interfacial tension through the melt linear viscoelastic properties. High-density polyethylene (HDPE)/polystyrene (PS)/poly(methyl methacrylate) (PMMA) ternary blend system with core-shell morphology was selected as a model. Blends comprising different compositions were prepared via melt mixing. The viscoelastic data required for this research was obtained via small amplitude oscillatory experiments performed on the blend components, binary blends and ternary blend. Several constitutive rheological models including Palierne, Bousmina, Dickie and Jacobs were considered using different approaches for the definition of core-shell as a dispersed phase. The Jacobs model was found to be in good agreement with the experimental results. This could be explained in terms of contribution of additional interfacial tension in the deformation of core-shell droplets, which is more compatible with the assumptions made in the Jacobs model. Nonlinear viscoelastic properties of the samples were also investigated to provide more insights into understanding the role of core-shell (PS/PMMA) droplets on determining the viscoelastic behavior of the ternary blend.

中文翻译：

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乳液模型预测具有核壳形态的三元聚合物共混物粘弹性行为能力的比较研究

本研究的目的是找到一种方法，将现有的本构粘弹性模型应用于形成核壳形态的三元聚合物共混物。还尝试通过熔体线性粘弹性来量化界面张力。选择具有核壳形态的高密度聚乙烯（HDPE）/聚苯乙烯（PS）/聚（甲基丙烯酸甲酯）（PMMA）三元共混体系作为模型。通过熔融混合制备包含不同组合物的共混物。本研究所需的粘弹性数据是通过对混合组分、二元混合和三元混合进行的小振幅振荡实验获得的。包括Palierne、Bousmina、Dickie 和Jacobs 在内的几种本构流变模型被考虑使用不同的方法来定义核-壳为分散相。发现 Jacobs 模型与实验结果非常吻合。这可以通过额外界面张力对核壳液滴变形的贡献来解释，这与 Jacobs 模型中的假设更相符。还研究了样品的非线性粘弹性，以更深入地了解核壳 (PS/PMMA) 液滴在确定三元混合物的粘弹性行为方面的作用。