Dynamics of Entangled Polymers Confined between Graphene Oxide Sheets as Studied by Neutron Reflectivity,ACS Macro Letters

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Dynamics of Entangled Polymers Confined between Graphene Oxide Sheets as Studied by Neutron Reflectivity
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-07-19 00:00:00 , DOI: 10.1021/acsmacrolett.7b00416
Ki-In Choi _{1,

2} , Tae-Ho Kim ₁ , Guangcui Yuan ₃ , Sushil K. Satija ₃ , Jaseung Koo ₁

Affiliation

For graphene-based composites, the dynamics of polymers confined between graphene sheets are a key parameter governing the overall mechanical properties of bulk materials. Here, we used neutron reflectivity (NR) to measure the diffusion dynamics of polymer melts confined between graphene oxide (GO) surfaces. From the NR results, we found that the diffusion coefficients of poly(methyl methacrylate) (PMMA) between the GO sheets were dramatically reduced by more than 1 order of magnitude when the film thickness was less than ∼3 times the gyration radius of the bulk polymer (R_g), whereas the diffusion of the polystyrene (PS) films sandwiched between GO sheets was only three times slower as the PS thickness decreased from ∼8 R_g to 1 R_g. This difference was due to the fact that the polymer-GO interaction significantly influences the dynamics of confined polymer melts.

中文翻译：

用中子反射率研究石墨烯片间纠缠聚合物的动力学

对于基于石墨烯的复合材料，限制在石墨烯片之间的聚合物动力学是控制整体材料总体机械性能的关键参数。在这里，我们使用中子反射率（NR）来测量限制在氧化石墨烯（GO）表面之间的聚合物熔体的扩散动力学。从NR结果中，我们发现，当薄膜厚度小于本体旋转半径的3倍时，GO片材之间的聚甲基丙烯酸甲酯（PMMA）的扩散系数显着降低了1个数量级以上。聚合物（R _g），而夹在GO板之间的聚苯乙烯（PS）膜的扩散仅会慢三倍，因为PS厚度从〜8 R _g降低到1 R _g。这种差异是由于以下事实造成的：聚合物与GO的相互作用会显着影响受限聚合物熔体的动力学。

更新日期：2017-07-19

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