Thermally conductive and electrically insulating alumina-coated graphite/phthalonitrile composites with thermal stabilities

Alumina-coated graphite (Al2O3@graphite) core-shell particles were firstly synthesized by a liquid-phase chemical precipitation with the aid of sodium dodecyl sulfonate (SDS) surfactant using an inorganic precursor, then to fabricate thermally conductive and electrically insulating phthalonitrile co...

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Bibliographic Details
Published in:Composites science and technology Vol. 202; p. 108558
Main Authors: Liu, Xianyuan, Wang, Zilong, Sun, Jinsong, Zhao, Zehua, Zhan, Shuyi, Guo, Ying, Zhou, Heng, Liu, Wenbin, Wang, Jun, Zhao, Tong
Format: Journal Article
Language:English
Published: Barking Elsevier Ltd 20.01.2021
Elsevier BV
Subjects:
Aluminum oxide
Chemical precipitation
Chemical synthesis
Chemicals
Composite materials
Core-shell particles
Electrical insulation
Electrical properties
Electrical resistivity
Glass transition temperature
Graphite
Heat conductivity
High temperature
Liquid phases
Polymer-matrix composites (PMCs)
Temperature
Thermal conductivity
Thermal energy
Thermal management
Thermal properties
Weight loss
Thermal properties
Electrical properties
Polymer-matrix composites (PMCs)
ISSN:0266-3538, 1879-1050
Online Access:Get full text
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Summary:Alumina-coated graphite (Al2O3@graphite) core-shell particles were firstly synthesized by a liquid-phase chemical precipitation with the aid of sodium dodecyl sulfonate (SDS) surfactant using an inorganic precursor, then to fabricate thermally conductive and electrically insulating phthalonitrile composites by a hot-compression method. The obtained composite with 40 wt% Al2O3@graphite exhibited a thermal conductivity of 1.409 W/mK, 6.6 times that of pristine phthalonitrile matrix (0.214 W/mK). And the composites still retained electrical insulation below 20 wt% Al2O3@graphite content. Moreover, excellent thermal stabilities had been observed, compared with the glass transition temperature of pristine phthalonitriles (460 °C), the glass transition temperature of the composites decreased slightly but still high. Additionally, at 20 wt% content, the weight loss temperature (T5 and T10) and the char yield at 1000 °C (Yc1000) were 525 °C, 589 °C and 74.9% which was 8 °C, 14 °C and 3.1% higher than that of pristine phthalonitriles, respectively, which holds potential for use in the high temperature thermal management. [Display omitted]
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ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2020.108558