Fracture Toughness of Polymer Interfaces Compatibilized with Nanoparticle Brushes,Macromolecules

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Fracture Toughness of Polymer Interfaces Compatibilized with Nanoparticle Brushes
Macromolecules ( IF 5.1 ) Pub Date : 2022-06-12 , DOI: 10.1021/acs.macromol.2c00640
Husam Alkhodairi ₁ , Sanat K. Kumar ₁

Affiliation

Surface-active particles at immiscible polymer/polymer interfaces can provide unparalleled stability against droplet coalescence. However, they often deteriorate the fracture toughness (G_c) of the interface because their rigid cores act as stress concentrators. Here, we draw on the knowledge developed for the interfacial strengthening mechanisms of block and random copolymers to design analogous particle-based systems. We use silica nanoparticles “grafted-from” with poly(styrene-r-methyl methacrylate) (PS-r-PMMA) chains to strengthen PS/PMMA interfaces. In this manner, the silica cores suppress droplet coalescence, while the PS-r-PMMA grafts entangle with the homopolymers and transmit stress across the interface. Interestingly, we show that G_c for the interfaces compatibilized with these particle brushes can exceed that of the interfaces compatibilized with ungrafted copolymer analogues. Rheology experiments attribute this phenomenon to increased connectivity between the entanglement points in these hybrid particle brush systems.

中文翻译：

与纳米颗粒刷相容的聚合物界面的断裂韧性

在不混溶的聚合物/聚合物界面上的表面活性颗粒可以提供无与伦比的稳定性，防止液滴聚结。然而，它们通常会降低界面的断裂韧性 ( G _c )，因为它们的刚性核心充当应力集中器。在这里，我们利用为嵌段和无规共聚物的界面强化机制开发的知识来设计类似的基于粒子的系统。我们使用与聚（苯乙烯-r-甲基丙烯酸甲酯）（PS-r-PMMA）链“接枝”的二氧化硅纳米粒子来增强PS /PMMA 界面。以这种方式，二氧化硅核抑制液滴聚结，而 PS- r-PMMA 接枝与均聚物纠缠在一起并通过界面传递应力。有趣的是，我们表明与这些颗粒刷相容的界面的G _{c可以超过与未接枝的共聚物类似物相容的界面的 G c 。}流变学实验将这种现象归因于这些混合粒子刷系统中纠缠点之间的连接性增加。

更新日期：2022-06-12

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