作者：Yutian Zhu; Xiaodong Yang; Jinghua Yin; Wei Jiang
关键字：polymer blends, droplet-cluster transition, shear flow, PA6, SEBS, PP, parallel clusters
论文来源：期刊
具体来源：Physical Review E, 82, 031807 (2010)
发表时间：2010年

本文利用Linkam CSS 450现代光学显微镜平台在线研究了剪切流场下腐胶6（PA6）-苯乙烯-丁二烯-苯乙烯共聚物（SEBS）-聚丙烯（PP）三元混合体的形态和结构演变。在高剪切率（60 s-1）下，PA6和SEBS的大液滴破裂形成小的随机分布的PA6液滴，由SEBS包裹在PP基体中。随后将剪切率突然降低到1.5-3.5 s-1范围内，这些液滴聚集成为有序结构，即平行聚集体。有趣的是，这些平行聚集体垂直于剪切流方向。这些平行聚集体的一个重要特征是它们可以在给定剪切率下或流动停止后维持较长时间（数十分钟），这一特点使得我们可以通过降低温度来冻结该结构。

We have used a Linkam CSS 450 stage equipped with an optical microscope to study online the evolution of the morphology and structure of polyamide 6 (PA6)-poly(styrene-ethylene-butadiene-styrene) (SEBS)-polypropylene (PP) ternary blends under shear flow. At a high shear rate (60 s-1), large drops of PA6 and SEBS broke up to form small randomly distributed PA6 droplets covered by SEBS in the PP matrix. These droplets aggregated into a well-ordered structure, i.e., parallel clusters, after decreasing the shear rate abruptly to within the range of 1.5-3.5 s-1. Interestingly, these parallel clusters were aligned perpendicular to the direction of shear flow. An important feature of these parallel clusters is that they can be maintained for a long period of time (several tens of minutes) at the given shear rate or after cessation of flow; this feature allows us to freeze the structure by decreasing the temperature.

论文链接：https://doi.org/10.1103/PhysRevE.82.031807