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Domain Structures and Rheological Properties of Immiscible Polymer Blends under Shear Flow in Parallel Plates

机译:平行板剪切流下不混溶聚合物共混物的畴结构和流变性质

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摘要

Domain structures and rheological properties of immiscible polymer blends composed of components having almost the same viscosities in a parallel-plate (PP) geometry are studied in comparison with those in a cone-plate (CP) geometry. Both steady states and transient states after step increase of shear rate are examined. At steady states, it was confirmed that the domain size becomes smaller inversely proportional to the distance from the center (i.e., shear rate) along the radial direction of PP, consistent with the data in CP compared at the same shear rate. The related rheological data are also consistent. At transient states after the step increase of shear rate, there was no apparent long-range interference in the transient behaviors undergoing in different time scales at different positions along the radial direction of PP. The structure change and the related excess stresses of immiscible polymer blends with the nearly same viscosities under shear flow in PP are consistent with those in the CP geometry.
机译:与锥板(CP)几何形状相比,研究了由在平行板(PP)几何形状中具有几乎相同粘度的组分组成的不混溶聚合物共混物的畴结构和流变性能。剪切速率逐步增加后的稳态和瞬态都被检查。在稳定状态下,已确认,与沿着PP的径向方向到中心的距离(即,剪切速率)成反比,畴尺寸变小,这与在相同剪切速率下CP中的数据一致。有关的流变数据也一致。在剪切速率逐步增加后的瞬态下,沿PP径向不同位置在不同时间尺度上发生的瞬态行为没有明显的长期干扰。 PP中剪切流动下具有几乎相同粘度的不混溶聚合物共混物的结构变化和相关的过大应力与CP几何中的一致。

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