Size-Dependent Submerging of Nanoparticles in Polymer Melts: Effect of Line Tension.,Macromolecules

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Size-Dependent Submerging of Nanoparticles in Polymer Melts: Effect of Line Tension.
Macromolecules ( IF 5.1 ) Pub Date : 2018-03-16 , DOI: 10.1021/acs.macromol.7b02353
Shanqiu Liu ₁ , Anupam Pandey ₁ , Joost Duvigneau ₁ , Julius Vancso ₁ , Jacco H Snoeijer _{1,

2}

Affiliation

Adhesion of nanoparticles to polymer films plays a key role in various polymer technologies. Here we report experiments that reveal how silica nanoparticles adhere to a viscoelastic PMMA film above the glass transition temperature. The polymer was swollen with CO2, closely matching the conditions of nanoparticle-nucleated polymer foaming. It is found that the degree by which the particles sink into the viscoelastic substrate is strongly size dependent and can even lead to complete engulfment for particles of diameter below 12 nm. These findings are explained quantitatively by a thermodynamic analysis, combining elasticity, capillary adhesion, and line tension. We argue that line tension, here proposed for the first time in elastic media, is responsible for the nanoparticle engulfment.

中文翻译：

纳米粒子在聚合物熔体中的尺寸依赖性浸没：线张力的影响。

纳米粒子与聚合物薄膜的粘附在各种聚合物技术中起着关键作用。在这里，我们报告的实验揭示了二氧化硅纳米粒子如何在玻璃化转变温度以上粘附到粘弹性 PMMA 薄膜上。聚合物被二氧化碳溶胀，与纳米颗粒成核聚合物发泡的条件非常匹配。发现颗粒沉入粘弹性基材的程度强烈依赖于尺寸，甚至可以导致直径低于 12 nm 的颗粒完全被吞没。这些发现通过热力学分析定量解释，结合弹性、毛细血管粘附和线张力。我们认为，这里首次在弹性介质中提出的线张力是纳米颗粒吞噬的原因。

更新日期：2018-03-16

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