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ELECTRICAL RESISTIVITY, CRYSTALLIZATION AND MECHENICAL PROPERTIES OF POLYPROPYLENE/MULTI-WALLED CARBON NANOTUBE/CALCIUM CARBONATE COMPOSITES PREPARED BY MELT MIXING

Institute of Polymer Science and Engineering, Department of Chemical Engineering, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

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Zhao-xia Guo

Institute of Polymer Science and Engineering, Department of Chemical Engineering, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

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, and

Jian Yu

Institute of Polymer Science and Engineering, Department of Chemical Engineering, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Corresponding author.

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Abstract

Polypropylene (PP)/multi-walled carbon nanotube (MWCNT)/calcium carbonate (CaCO₃) composites are prepared by melt mixing using two types of CaCO₃ of different sizes. The electrical resistivities of the composites with the two types of CaCO₃ are all lower than those of the corresponding PP/MWCNT composites at various MWCNT loadings (1 wt%–5 wt%). The morphology of the composites is investigated by field emission scanning electron microscopy (FESEM). The crystallization behavior of PP in the composites is characterized by differential scanning calorimetry (DSC). The storage modulus, as measured by dynamic mechanical analysis (DMA), increases significantly by the presence of CaCO₃.

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