Enhanced Dynamics of Confined Polymers near the Immiscible Polymer–Polymer Interface: Neutron Reflectivity Studies,ACS Macro Letters

当前位置： X-MOL 学术 › ACS Macro Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Enhanced Dynamics of Confined Polymers near the Immiscible Polymer–Polymer Interface: Neutron Reflectivity Studies
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-01-30 , DOI: 10.1021/acsmacrolett.9b01011
Kyoung-Il Jo _{1,

2} , Younghoon Oh ₃ , Bong June Sung ₃ , Tae-Ho Kim ₄ , Min Seop Um ₅ , Woo Jin Choi ₅ , Joona Bang ₂ , Guangcui Yuan ₆ , Sushil K Satija ₆ , Jaseung Koo ₄

Affiliation

For polymer-blend films, local dynamics in confined polymer domains tend to differ from the bulk because of significant contributions from the polymer–polymer interface. Herein, we investigated the diffusion dynamics of entangled polymer thin films confined between different polymers in a direction perpendicular to the surface using neutron reflectivity. We found that a bilayer of poly(methyl methacrylate) (PMMA) and deuterated PMMA (dPMMA) sandwiched between polystyrene (PS) layers exhibited significant increase in mobility near the polymer–polymer interface with decreasing PMMA thickness. This indicates that the contribution of repulsive interactions at the immiscible polymer–polymer interface becomes more significant as the film thickness decreases. We also found that the interfacial roughness between PMMA and PS (28 Å at equilibrium) and soft confinement of PS layers did not significantly affect the change in the diffusion dynamics of the adjacent PMMA. This was evidenced by comparison with the diffusion results of multilayers with a flat interface (8 Å at equilibrium) between PMMA and hard PS by UV cross-linking.

中文翻译：

不混溶聚合物-聚合物界面附近受限聚合物的增强动力学：中子反射率研究

对于聚合物共混薄膜，由于聚合物-聚合物界面的显着贡献，受限聚合物域中的局部动力学往往与本体不同。在这里，我们使用中子反射率研究了在垂直于表面的方向上限制在不同聚合物之间的纠缠聚合物薄膜的扩散动力学。我们发现聚甲基丙烯酸甲酯 (PMMA) 和氘代 PMMA ( d夹在聚苯乙烯 (PS) 层之间的 PMMA) 随着 PMMA 厚度的减小，在聚合物-聚合物界面附近的迁移率显着增加。这表明随着薄膜厚度的减小，在不混溶的聚合物-聚合物界面处排斥相互作用的贡献变得更加显着。我们还发现，PMMA 和 PS 之间的界面粗糙度（平衡时为 28 Å）和 PS 层的软约束并没有显着影响相邻 PMMA 扩散动力学的变化。这通过与通过紫外交联在 PMMA 和硬 PS 之间具有平坦界面（平衡时为 8 Å）的多层扩散结果进行比较来证明。

更新日期：2020-01-31

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11