Correlation between dispersion state and electrical conductivity of MWCNTs/PP composites prepared by melt blending |
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| Authors: | Yongzheng Pan Lin Li Siew Hwa Chan Jianhong Zhao |
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| Affiliation: | 1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075, Singapore;1. Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada;1. National University of Science and Technology MISiS, Russia;2. Yuri Gagarin State Technical University of Saratov, Russia;3. Université Catholique de Louvain, Belgium;1. Department of Polymer Science and Rubber Technology, Cochin University of Science and Technology, Kochi, 682022, Kerala, India;2. Department of Chemistry, Govt. College Chittur, Palakkad, 678104, Kerala, India;3. Department of Applied Chemistry, Cochin University of Science and Technology, Kochi, 682022, Kerala, India;4. Department of Ship Technology, Cochin University of Science and Technology, Kochi, 682022, Kerala, India;1. Carbon Composite Materials Research Center, Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeonbuk, 565-905, Republic of Korea;2. Nanomaterials Science and Engineering, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 305-350, Republic of Korea |
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| Abstract: | Non-conductive polymers filled with conductive carbon nanotubes (CNTs) often do not show detectable conductivity due to poor dispersion of carbon nanotubes in the polymer matrix and the lack of conductive networks formed from CNTs. In this work, we attempted two ways to improve the dispersion of multi-walled carbon nanotubes (MWCNTs) in a polypropylene (PP) matrix: chemical modification of MWCNTs and addition of a master batch as a compatibilizer, followed by melt blending using a micro-compounder. The relationship between the dispersion state of MWCNTs and the electrical conductivity of the CNTs/PP composites have been investigated by controlling several factors such as CNTs modification, compatibilization by a master batch, melt mixing, and post-heat treatment. The enhanced interfacial adhesion between the CNTs and the polymer could improve the dispersion of CNTs but it could also reduce the electrical conductivity of the composites. Meanwhile, it is interestingly found that the post-heat treatment could increase the conductivity remarkably due to the connection of CNTs into networks. Thus, it is concluded that the balance between dispersion of CNTs and the formation of conductive networks plays an important role in enhancing the electrical conductivity of composites. |
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