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Effects of the reduction of PAni-coated oxidized multiwall carbon nanotubes on the positive temperature coefficient behaviors of their carbon black/high density polyethylene composites
Affiliation:1. Carbon Composite Research Centre, Department of Polymer-Nano Science and Technology, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea;2. Advanced Materials Institute of BIN Technology (BK21 plus Global), Dept. of BIN Convergence Technology, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea;3. Surface Engineering & Tribology Division, CSIR-Central Mechanical Engineering Research Institute, Council of Scientific & Industrial Research (CSIR), Mahatma Gandhi Avenue, Durgapur 713209, India;1. Center for Advanced Materials, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China;2. Department of Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123, China;3. Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei, 230026, China;4. Department of Electronics Engineering, The Chinese University of Hong Kong, Hong Kong, China;1. Materials Research Center, Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Suwon, 446-712, South Korea;2. Department of Mechanical Engineering, Soongsil University, 369 Sangdo-ro, Donjak-gu, Seoul, 156-743, South Korea;3. Molds & Dies Technology Group, Korea Institute of Industrial Technology, 7-47 Songdo-dong, Yeonsoo-gu, Incheon, 21999, South Korea;1. School of Metallurgy and Environment, Central South University, Hunan, Changsha 410083, China;2. School of Materials Science and Engineering, Central South University, Hunan, Changsha 410083, China;3. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China;4. Department of Mechanical Engineering, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada
Abstract:Polyaniline (PAni)-coated reduced multiwall carbon nanotubes (PRMWNTs) and carbon black (CB)-filled high-density polyethylene (HDPE) composites (PRMWNTs/CB/HDPE) were prepared through a melt mixing method. Oxidized MWNTs (OMWNTs) were prepared by treating pristine multiwall carbon nanotubes (MWNTs) with an acid mixture (HNO3:H2SO4), and PAni-coated OMWNTs (POMWNTs) were synthesized via in-situ polymerization of aniline monomer in the presence of OMWNTs. POMWNTs were further reduced using hydrazine monohydrate to obtain the PRMWNTs. Fourier transform infrared (FT-IR) spectra and thermogravimetric analysis (TGA) confirmed the formation of PRMWNTs. PRMWNTs showed significantly improved thermal stability and electrical conductivity comparing to POMWNTs. The positive temperature coefficient (PTC) behavior of PRMWNTs/CB/HDPE composites revealed enhanced PTC intensity and electrical conductivity at room temperature compared to POMWNTs/CB/HDPE composites. The PRMWNTs-10/CB/HDPE composite showed high peak resistivity (301.99 MΩ-cm) and low room temperature resistivity compared to the POMWNTs/CB/HDPE composite, and thus showed the highest PTC intensity value of 6.693 as well as very excellent cyclic stability.
Keywords:Reduction  Polyaniline  Multiwall carbon nanotube  Electrical conductivity  Positive temperature coefficient  Polymer composite
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