TY - JOUR
T1 - Synergistic enhancement of thermal conductivity and dielectric properties in Al2O3/BaTiO3/PP composites
AU - Yao, Junlong
AU - Hu, Li
AU - Zhou, Min
AU - You, Feng
AU - Jiang, Xueliang
AU - Gao, Lin
AU - Wang, Qing
AU - Sun, Zhengguang
AU - Wang, Jun
N1 - Funding Information:
We acknowledge the support from the National Science Foundation of China (Grant No. 51273154), Natural Science Foundation of Hubei province (No. 2017CFB289) and Open Project Fund of Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials. This research is supported by the National Natural Science Foundation of China (NSFC: 51273154), and Natural Science Foundation of Hubei province (2017CFB289).
Publisher Copyright:
© 2018 by the author.
PY - 2018/8/26
Y1 - 2018/8/26
N2 - 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/mcK 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 (εr = 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.
AB - 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/mcK 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 (εr = 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.
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U2 - 10.3390/ma11091536
DO - 10.3390/ma11091536
M3 - Article
C2 - 30149676
AN - SCOPUS:85052494318
SN - 1996-1944
VL - 11
JO - Materials
JF - Materials
IS - 9
M1 - 1536
ER -