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首页> 外文期刊>Journal of Applied Polymer Science >Graphene nanoribbons (GNRs) by unzipping MWCNTs for the improvement of PMMA microcellular foams
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Graphene nanoribbons (GNRs) by unzipping MWCNTs for the improvement of PMMA microcellular foams

机译：石墨烯纳米波纹（GNRS）通过解压缩MWCNT，用于改善PMMA微孔泡沫

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摘要

This work presents the cellular microstructures and properties of PMMA/graphene nanoribbons (GNRs) microcellular foams. GNRs were obtained by oxidative unzipping multiwalled carbon nanotubes and solvent thermal reduction in dimethylformamide (DMF), then they were mixed with PMMA to fabricate PMMA/GNRs nanocomposites by solution blending. Subsequently, supercritical carbon dioxide (scCO(2)) as a friendly foaming agent was applied to fabricate PMMA/GNRs microcellular foam by a batch foaming in a special mold. The morphology of cell structure was analyzed by scanning electron microscopy and image software, showing that the addition of a smaller content of GNRs caused a fine cellular structure with a higher cell density (similar to 3 x 10(11) cells/cm(3)) and smaller cell sizes (similar to 1 mu m) due to their remarkable heterogeneous nucleation effect. The mechanical testing of PMMA/GNRs microcellular foams demonstrated that the obtained GNRs also could be used as a reinforcing filler to increase the mechanical properties of PMMA foams. An improvement in the compressive strength of similar to 80% (about 39% increase standardized by specific compressive strength) was achieved by 1.5 wt % GNRs addition, and the thermal stability of PMMA/GNRs foams was enhanced too. (C) 2017 Wiley Periodicals, Inc.
机译：该工作介绍了PMMA /石墨烯纳米杆（GNRS）微孔泡沫的细胞微观结构和性质。通过氧化的解氮化多壁碳纳米管和二甲基甲酰胺（DMF）的溶剂热还原获得GNR，然后将它们与PMMA混合以通过溶液混合制造PMMA / GNR纳米复合材料。随后，将超临界二氧化碳（SCCO（2））作为一种友好的发泡剂，通过在特殊模具中通过批量发泡来制造PMMA / GNRS微孔泡沫。通过扫描电子显微镜和图像软件分析细胞结构的形态，表明添加较小的GNR含量导致细胞密度更高的细胞结构（类似于3×10（11）个单元/ cm（3）由于其显着的异质成核效果，细胞尺寸（类似于1μm）。 PMMA / GNRS微孔泡沫的机械测试证明，所得GNR也可用作增强填料，以增加PMMA泡沫的机械性能。通过1.5wt％GNRS加入实现了与80％（通过特异性抗压强度标准化的约39％的增加约39％的增加约39％）的改善，增强了PMMA / GNRS泡沫的热稳定性。 （c）2017 Wiley期刊，Inc。

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