Thermally conductive and electrically insulating alumina-coated graphite/phthalonitrile composites with thermal stabilities. (20th January 2021)

• Record Type: Journal Article
• Authors: Liu, Xianyuan; Wang, Zilong; Sun, Jinsong; Zhao, Zehua; Zhan, Shuyi; Guo, Ying; Zhou, Heng; Liu, Wenbin; Wang, Jun; Zhao, Tong
• Is Part Of: Composites science and technology. Volume 202(2021)
• Publication Date: 2021-01-20
• Subjects: Polymer-matrix composites (PMCs) -- Thermal properties -- Electrical properties; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2020.108558
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: Alumina-coated graphite (Al2 O3 @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% Al2 O3 @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% Al2 O3 @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 (Yc 1000) 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. Graphical abstract: Image 1