Weir M P, Johnson D W, Boothroyd S C, Savage R C, Thompson R L, King S M, Rogers S E, Coleman K S, Clarke N
Department of Physics and Astronomy, The University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom.
Department of Chemistry, University of Durham, Durham DH1 3LE, United Kingdom.
ACS Macro Lett. 2016 Apr 19;5(4):430-434. doi: 10.1021/acsmacrolett.6b00100. Epub 2016 Mar 9.
We study the conformations of polymer chains in polymer-graphene oxide nanocomposites. We show that the chains have a reduced radius of gyration that is consistent with confinement at a solid interface in the melt, as is expected for well-dispersed, high aspect ratio nanoparticles that are much larger than the polymer coil size. We show that confinement of the polymer chains causes a corresponding reduction in interchain entanglements, and we calculate a contribution to the plateau modulus from the distorted polymer network via a simple scaling argument. Our results are a significant step forward in understanding how two-dimensional nanoparticles affect global material properties at low loadings.
我们研究了聚合物-氧化石墨烯纳米复合材料中聚合物链的构象。我们发现，这些链的回转半径减小，这与熔体中固体界面处的受限情况一致，对于尺寸远大于聚合物线团尺寸的、分散良好且高纵横比的纳米颗粒而言，这是预期的结果。我们表明，聚合物链的受限导致链间缠结相应减少，并且我们通过一个简单的标度论证计算了扭曲的聚合物网络对平台模量的贡献。我们的结果在理解二维纳米颗粒如何在低负载下影响整体材料性能方面向前迈出了重要一步。
