The delicate flow-induced morphology of immiscible polypropylene/polystyrene blends in the presence of silica nanoparticles (NPs) is investigated in a multiparameter space. The morphology map constructed based on in situ morphology observation reveals that a critical ratio of NP concentration to droplet concentration, which strongly depends on the NP surface chemistries and the ratio of the NP concentration to the droplet concentration, exists. Below or above the critical ratio, the NPs display diverse effects on the morphology (promote or suppress droplet coalescence). These results can be interpreted by the competition between the bridging mechanism (acceleratory effect) and the enhanced viscoelasticity (inhibitory effect) exerted by the NPs.

中文翻译：

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纳米颗粒填充的不混溶聚合物共混物在流动中的形态图：纳米颗粒浓度和液滴浓度之间存在临界比率

在多参数空间中研究了二氧化硅纳米粒子 (NP) 存在下不混溶的聚丙烯/聚苯乙烯共混物的精致流动诱导形态。基于原位形貌观察构建的形貌图表明，存在纳米颗粒浓度与液滴浓度的临界比，该比值强烈依赖于纳米颗粒表面化学性质以及纳米颗粒浓度与液滴浓度的比值。低于或高于临界比率，纳米颗粒对形态表现出不同的影响（促进或抑制液滴聚结）。这些结果可以通过纳米粒子发挥的桥接机制（加速效应）和增强的粘弹性（抑制效应）之间的竞争来解释。