Thermal transport phenomena and limitations in heterogeneous polymer composites containing carbon nanotubes and inorganic nanoparticles |
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| Affiliation: | 1. Department of Mechanical Engineering, National University of Singapore, 117576 Singapore, Singapore;2. Department of Petroleum Engineering, Texas A&M University, College Station, TX 77843, United States;3. School of Chemical, Biological, and Materials Engineering, University of Oklahoma, Norman, OK 73019, United States;1. Campus UFV-Florestal, Universidade Federal de Viçosa, CEP 35690-000, Florestal, Minas Gerais, Brazil;2. Departamento de Física e Matemática, Centro Federal de Educação Tecnológica de Minas Gerais, CEP 30510-000, Belo Horizonte, Minas Gerais, Brazil;3. Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, CP 702, CEP 30123-970, Belo Horizonte, Minas Gerais, Brazil;1. State Key Laboratory of Marine Environmental Science, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of the Environment and Ecology, Xiamen University, Xiamen 361005, China;2. Shenzhen Research Institute of Xiamen University, Shenzhen, China;1. Department of Mathematics, Government Postgraduate College Haripur, Pakistan;2. Department of Applied Mathematics and Statistics, Institute of Space Technology, P.O. Box 2750, Islamabad, 44000, Pakistan;3. College of Engineering, Al Ain University, Al Ain, United Arab Emirates;4. Department of Mathematics, Tafila Technical University Tafila, Jordan;5. Mechanical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Al-Riyadh, 11421, Saudi Arabia;6. Research Institute for Natural Sciences, Hanyang University, Seoul, 04763, South Korea |
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| Abstract: | An Off-Lattice Monte Carlo model was developed to investigate effective thermal conductivities (Keff) and thermal transport limitations of polymer composites containing carbon nanotubes (CNTs) and inorganic nanoparticles. The simulation results agree with experimental data for poly(ether ether ketone) (PEEK) with inclusions of CNTs and tungsten disulfide (WS2) nanoparticles. The developed model can predict the thermal conductivities of multiphase composite systems more accurately than previous models by taking into account interfacial thermal resistance (Rbd) between the nanofillers and the polymer matrix, and the nanofiller orientation and morphology. The effects of (i) Rbd of CNT–PEEK and WS2–PEEK (0.0232–115.8 × 10?8 m2K/W), (ii) CNT concentration (0.1–0.5 wt%), (iii) CNT morphology (aspect ratio of 50–450, and diameter of 2–8 nm), and (iv) CNT orientation (parallel, random and perpendicular to the heat flux) on Keff of a multi-phase composite are quantified. The simulation results show that Keff of multiphase composites increases when the CNT concentration increases, and when the Rbd of CNT–PEEK and WS2–PEEK interfaces decrease. The thermal conductivity of composites with CNTs parallel to the heat flux can be enhanced ～2.7 times relative to that of composites with randomly-dispersed CNTs. CNTs with larger aspect ratio and smaller diameter can significantly improve the thermal conductivity of a multiphase polymer composite. |
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