Abstract We studied the selective localization of carbon nanofillers, such as multi-walled carbon nanotube (MWCNT) and graphene nanoplatelet (GNP), in immiscible polymer blends composed of polycarbonate (PC) and polyethylene (PE) or ethylene-propylene copolymer (EPR). It was found that the distribution state of the carbon nanofillers in the composites is greatly affected by the mixing temperature and the species of nanofillers. MWCNTs resided in the PE or EPR phase in the composites, which cannot be explained by the difference in the interfacial tension. A similar morphology was detected in the PC/GNP/PE composite prepared at 300 °C. In contrast, the PC/GNP/PE composite prepared at the low temperature (250 °C) and the PC/GNP/EPR composites have the carbon nanofillers mostly in the PC phase. The selective localization in the PE or EPR phase is attributed to the surface adsorption of PE or EPR chains on the carbon nanofillers, which is more obvious for PE and at the high mixing temperature. These results demonstrate that both the species of carbon nanofillers and the mixing temperature affect the carbon nanofiller distribution in the immiscible blends.

中文翻译：

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混合温度对聚碳酸酯和聚烯烃不混溶共混物中碳纳米填料分布的影响

摘要 我们研究了碳纳米填料，如多壁碳纳米管 (MWCNT) 和石墨烯纳米片 (GNP) 在由聚碳酸酯 (PC) 和聚乙烯 (PE) 或乙烯-丙烯共聚物 (EPR) 组成的不混溶聚合物混合物中的选择性定位。 . 结果表明，复合材料中碳纳米填料的分布状态受混合温度和纳米填料种类的影响很大。MWCNTs 位于复合材料中的 PE 或 EPR 相中，这不能用界面张力的差异来解释。在 300 °C 下制备的 PC/GNP/PE 复合材料中检测到类似的形态。相比之下，在低温（250°C）下制备的 PC/GNP/PE 复合材料和 PC/GNP/EPR 复合材料的碳纳米填料主要位于 PC 相中。在 PE 或 EPR 相中的选择性定位归因于 PE 或 EPR 链在碳纳米填料上的表面吸附，这对于 PE 和在高混合温度下更为明显。这些结果表明，碳纳米填料的种类和混合温度都会影响不混溶混合物中碳纳米填料的分布。