Preparation of Thermally Conductive, Electrically Insulating Polyamide 6 Composite with a Hybrid Network of Alumina and Low Temperature Expandable Graphite and Its Properties

被引：0
|
作者：
Li Y. [1 ]
Chen Y. [1 ]
Zou H. [1 ]
Liang M. [1 ]
机构：
[1] Polymer Research Institute of Sichuan University, State Key Laboratory of Polymer Materials Engineering, Chengdu
来源：
Zou, Huawei (hwzou@163.com) | 2018年 / Sichuan University卷 / 34期
关键词：
Alumina; Electrical insulation; Expandable graphite; Polyamide; 6; Thermal conductivity;
D O I：
10.16865/j.cnki.1000-7555.2018.09.020
中图分类号：
学科分类号：
摘要：
Two-dimensional low temperature expandable graphite (LTEG) has outstanding electrical and thermal properties, and can be used to enhance thermal conductivity of polymer composites. Al2O3 and two-dimensional LTEG were added into polyamide6 (PA6) resin to prepare composites with improved thermal conductivity and electrical insulation via the in-situ exfoliation of LTEG during a melt blending process. An optimal proportion of LTEG was used as part of the thermally conductive fillers to guarantee electrical insulation. LTEG flakes act as bridges between Al2O3 and promote thermally-conductive pathways, hence a higher thermal conductivity. The composite containing 5% of LTEG and 60% of Al2O3 reaches the thermal conductivity of 2.019 W/(m•K), which is 596.2% higher than that of the virgin PA6. Although incorporating LTEG deteriorates volume resistivity, decreasing by 2~3 orders of magnitude compared with that of PA6 resin, and the volume resistivity reveals that the resultant composites still exhibit high volume resistivity, which is in the range of 1012 to 1013 Ω•cm. © 2018, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：120 / 125
页数：5
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