Distortion of Chain Conformation and Reduced Entanglement in Polymer-Graphene Oxide Nanocomposites
Distortion of Chain Conformation and Reduced Entanglement in Polymer-Graphene Oxide Nanocomposites
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DOI：
10.1021/acsmacrolett.6b00100
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发表时间：
2016-04-01
影响因子：
7.015
通讯作者：
Clarke, N.
中科院分区：
文献类型：
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作者：
Weir, M. P.;Johnson, D. W.;Clarke, N.
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，链的旋转半径减小，这与熔体中固体界面的约束一致，这与预期的分散良好、高纵横比的纳米颗粒比聚合物线圈尺寸大得多的情况一致。我们证明了聚合物链的约束导致链间纠缠的相应减少，并且我们通过简单的缩放论证计算了扭曲的聚合物网络对平台模量的贡献。我们的研究结果在理解二维纳米粒子如何在低负载下影响整体材料特性方面迈出了重要的一步。
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.