Position-Dependent Diffusion Dynamics of Entangled Polymer Melts Nanoconfined by Parallel Immiscible Polymer Films,ACS Macro Letters

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Position-Dependent Diffusion Dynamics of Entangled Polymer Melts Nanoconfined by Parallel Immiscible Polymer Films
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-10-09 , DOI: 10.1021/acsmacrolett.0c00608
Kyoung-Il Jo _{1,

2} , Younghoon Oh ₃ , Tae-Ho Kim ₄ , Joona Bang ₂ , Guangcui Yuan ₅ , Sushil K Satija ₅ , Bong June Sung ₃ , Jaseung Koo ₄

Affiliation

The morphological structure and dynamics of confined polymers adjacent to the polymer–polymer interface have a profound effect on determining the overall physical properties of polymer blends. We measured the diffusion dynamics of poly(methyl methacrylate) (PMMA) melts confined between polystyrene (PS) layers using neutron reflectivity. Combinations of various thicknesses of PMMA and deuterated PMMA (dPMMA) allowed us to experimentally reveal the nonmonotonic behavior of polymer mobility near the PS–PMMA interface. From the neutron reflectivity results, we found that the polymers adjacent to the immiscible polymer–polymer interface showed enhanced diffusion dynamics because of the repulsive interaction between PS and PMMA, whereas the polymer at local regions farther from the interface exhibited reduced dynamics. This is probably due to the nonspherical conformation of PMMA and spatial confinement near the PS–PMMA interface.

中文翻译：

平行不混溶聚合物薄膜纳米限制的缠结聚合物熔体的位置依赖性扩散动力学

聚合物-聚合物界面附近的受限聚合物的形态结构和动力学对于确定聚合物共混物的整体物理性能具有深远的影响。我们使用中子反射率测量了限制在聚苯乙烯 (PS) 层之间的聚甲基丙烯酸甲酯 (PMMA) 熔体的扩散动力学。不同厚度的 PMMA 和氘代 PMMA ( d PMMA) 的组合使我们能够通过实验揭示 PS-PMMA 界面附近聚合物迁移率的非单调行为。从中子反射率结果中，我们发现，由于PS和PMMA之间的排斥相互作用，邻近不混溶聚合物-聚合物界面的聚合物表现出增强的扩散动力学，而远离界面的局部区域的聚合物表现出减弱的动力学。这可能是由于 PMMA 的非球形构象和 PS-PMMA 界面附近的空间限制。

更新日期：2020-10-21

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