Preparation of alumina-coated graphite for thermally conductive and electrically insulating epoxy composites

被引：33
作者：
Tang, Dahang [1 ]
Su, Juqiao [1 ]
Yang, Qi [1 ]
Kong, Miqiu [1 ]
Zhao, Zhongguo [1 ]
Huang, Yajiang [1 ]
Liao, Xia [1 ]
Liu, Ying [1 ]
机构：
[1] Sichuan Univ, State Key Lab Polymer Mat Engn, Coll Polymer Sci & Engn, Chengdu 610065, Peoples R China
来源：
RSC ADVANCES | 2015年 / 5卷 / 68期
关键词：
BORON-NITRIDE; CARBON NANOTUBES; POLYMER COMPOSITES; SILICA; NANOCOMPOSITES; NANOPLATELETS; FABRICATION; PERCOLATION;
D O I：
10.1039/c5ra08010j
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Herein, highly thermally conductive and insulating epoxy composites were reported. Firstly uniform alumina-coated graphite flakes were successfully prepared by a two-step coating method of chemical precipitation with the aid of a sodium dodecyl sulfonate (SDS) surfactant using an inorganic precursor (aluminum nitrate) as the starting material. Then the alumina-coated graphite particles were incorporated into the epoxy resin. The thermal conductivity value of epoxy/alumina-coated graphite composite shows a significant increase from 0.22 W mK(-1) (neat epoxy) to 0.64 W mK(-1) by a factor of approximately 3 at the filler loading of 18.4%. Moreover, due to the presence of the alumina nanolayers coating on the graphite surface, epoxy/alumina-coated graphite composites could retain high electrical volume resistivity of >10(10) Omega cm up to high filler contents, which was much higher than that of epoxy/graphite composites (<10(5) Omega cm) at the same filler loadings. And they still could be regarded as insulators.
引用
收藏
页码：55170 / 55178
页数：9
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