由平行不混溶聚合物薄膜纳米限域的缠结聚合物熔体的位置依赖性扩散动力学
Position-Dependent Diffusion Dynamics of Entangled Polymer Melts Nanoconfined by Parallel Immiscible Polymer Films.
作者信息
Jo Kyoung-Il, Oh Younghoon, Kim Tae-Ho, Bang Joona, Yuan Guangcui, Satija Sushil K, Sung Bong June, Koo Jaseung
机构信息
Neutron Science Center, Korea Atomic Energy Research Institute (KAERI), Daejeon 34057, Korea.
Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea.
出版信息
ACS Macro Lett. 2020 Oct 20;9(10):1483-1488. doi: 10.1021/acsmacrolett.0c00608. Epub 2020 Oct 9.
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 (PMMA) 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.
与聚合物-聚合物界面相邻的受限聚合物的形态结构和动力学对决定聚合物共混物的整体物理性能有着深远影响。我们使用中子反射率测量了聚甲基丙烯酸甲酯（PMMA）熔体在聚苯乙烯（PS）层之间的扩散动力学。不同厚度的PMMA和氘代聚甲基丙烯酸甲酯（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，我们发现与不相容的聚合物-聚合物界面相邻的聚合物由于PS和PMMA之间的排斥相互作用而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动力学则降低。这可能是由于PMMA的非球形构象以及PS-PMMA界面附近的空间限制。
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