Abstract We report that the surface roughness of solid particles plays a crucial role in determining their migration and distribution within flowing polymer blends as well as their regulation ability toward the blend morphology. During slow shearing, smooth particles exhibit remarkable accumulation at the droplet/matrix interface while the rough ones prefer to locate within the droplets uniformly. As a result, droplets tend to adopt a vorticity alignment due to the strong interfacial jamming effect upon the addition of a small amount of smooth particles. In contrast, more rough particles are needed to induce a similar phenomenon via a rheological enhancement effect. The prominent discrepancy in the behavior of two kinds of particles in the blend could be understood by the diffusion and contact line pinning behavior of particles controlled by their surface roughness. Exploring the underlying mechanism may have an important implication for a rational design of universal particle emulsifiers for multiphase materials such as polymer blends and functional emulsions.

中文翻译：

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粗糙度调节的颗粒迁移和分布对流动聚合物共混物结构演变的影响

摘要 我们报告说，固体颗粒的表面粗糙度在决定它们在流动的聚合物共混物中的迁移和分布以及它们对共混物形态的调节能力方面起着至关重要的作用。在缓慢剪切过程中，光滑的颗粒在液滴/基质界面处表现出显着的积累，而粗糙的颗粒更喜欢均匀地定位在液滴内。因此，由于加入少量光滑颗粒后的强界面干扰效应，液滴倾向于采用涡流排列。相比之下，需要更粗糙的颗粒来通过流变增强效应诱发类似的现象。混合物中两种颗粒行为的显着差异可以通过由其表面粗糙度控制的颗粒的扩散和接触线钉扎行为来理解。探索潜在机制可能对合理设计用于多相材料（如聚合物共混物和功能乳液）的通用颗粒乳化剂具有重要意义。