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Open AccessArticle

Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites

1
School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China
2
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA
3
Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, China
4
School of Chemistry and Environmental Engineering, Jianghan University, Wuhan 430056, China
5
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(9), 1536; https://doi.org/10.3390/ma11091536
Received: 25 July 2018 / Revised: 6 August 2018 / Accepted: 21 August 2018 / Published: 26 August 2018
(This article belongs to the Special Issue Advanced Functional Nanomaterials and Their Applications)
Multifunctional polymer composites with both high dielectric constants and high thermal conductivity are urgently needed by high-temperature electronic devices and modern microelectromechanical systems. However, high heat-conduction capability or dielectric properties of polymer composites all depend on high-content loading of different functional thermal-conductive or high-dielectric ceramic fillers (every filler volume fraction ≥ 50%, i.e., ffiller ≥ 50%), and an overload of various fillers (fthermal-conductive filler + fhigh-dielectric filler > 50%) will decrease the processability and mechanical properties of the composite. Herein, series of alumina/barium titanate/polypropylene (Al2O3/BT/PP) composites with high dielectric- and high thermal-conductivity properties are prepared with no more than 50% volume fraction of total ceramic fillers loading, i.e., ffillers ≤ 50%. Results showed the thermal conductivity of the Al2O3/BT/PP composite is up to 0.90 W/m·K with only 10% thermal-conductive Al2O3 filler, which is 4.5 times higher than the corresponding Al2O3/PP composites. Moreover, higher dielectric strength (Eb) is also found at the same loading, which is 1.6 times higher than PP, and the Al2O3/BT/PP composite also exhibited high dielectric constant ( ε r = 18 at 1000 Hz) and low dielectric loss (tan δ ≤ 0.030). These excellent performances originate from the synergistic mechanism between BaTiO3 macroparticles and Al2O3 nanoparticles. View Full-Text
Keywords: thermal conductivity; dielectric properties; synergistic effect; polymer composites; ceramic thermal conductivity; dielectric properties; synergistic effect; polymer composites; ceramic
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Yao, J.; Hu, L.; Zhou, M.; You, F.; Jiang, X.; Gao, L.; Wang, Q.; Sun, Z.; Wang, J. Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites. Materials 2018, 11, 1536.

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