高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (4): 20210800.doi: 10.7503/cjcu20210800

• 高分子化学 • 上一篇    下一篇

导热膨胀石墨/聚醚酰亚胺复合材料的制备与性能

赵君禹1, 王春博2, 王成杨1, 张克1, 丛冰1, 杨岚1, 赵晓刚1(), 陈春海1   

  1. 1.吉林大学化学学院, 特种工程塑料教育部重点实验室, 高性能聚合物合成技术国家?地方联合工程实验室, 长春 130012
    2.中国科学院长春应用化学研究所高分子复合材料工程实验室, 长春 130012
  • 收稿日期:2021-11-24 出版日期:2022-04-10 发布日期:2022-01-26
  • 通讯作者: 赵晓刚 E-mail:xiaogang@jlu.edu.cn

Preparation and Performance of Thermally Conductive Expanded Graphite/Polyetherimide Composites

ZHAO Junyu1, WANG Chunbo2, WANG Chengyang1, ZHANG Ke1, CONG Bing1, YANG Lan1, ZHAO Xiaogang1(), CHEN Chunhai1   

  1. 1.National & Local Joint Engineering Laboratory for Synthesis Technology of High Performance Polymer,Key Laboratory of High Performance Plastics,Ministry of Education,College of Chemistry,Jilin University,Changchun 130012,China
    2.Polymer Composites Engineering Laboratory,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
  • Received:2021-11-24 Online:2022-04-10 Published:2022-01-26
  • Contact: ZHAO Xiaogang E-mail:xiaogang@jlu.edu.cn

摘要:

利用膨胀石墨(EG)经高温处理后比表面积大的特点, 以膨胀石墨作为导热填料, 通过球磨和热模压方法制备了膨胀石墨/聚醚酰亚胺(PEI)导热复合材料, 并对其加工过程、 微观形貌、 热性能和导热性能进行了研究. 结果表明, 球磨处理可以打破膨胀石墨的“泡沫”状态并减少石墨纳米片间的间隙, 热压可以诱使和促进石墨纳米片沿着水平方向排列和取向, 从而显著提升了复合材料的平面内导热性能. 当膨胀石墨在复合材料中的质量分数为20%时, EG/PEI复合材料的面内导热系数为2.38 W?m?1?K?1. 与PEI相比, 复合材料导热系数的增幅约为12倍. 所制备的EG/PEI复合材料均具有良好的散热能力、 较好的热稳定性和较高的储能模量, 是一种综合性能优异的导热材料.

关键词: 聚酰亚胺, 膨胀石墨, 复合材料, 导热性能

Abstract:

Large specific surface area and high thermal conductivity of graphite nanoplatelets(GNP) on expanded graphite(EG) after heat treatment was taken advantage, the crushed EG was used as thermally conductive filler and compounded with polyetherimide(PEI) through ball milling. Then the EG/PEI composites was prepared by thermal lamination, and its microscopic morphology, thermal conductivity and thermal performance were studied. The results show that ball milling treatment can reduce the pores between GNP and GNP and facilitate the uniform mixing of EG and PEI. Hot pressing can induce and promote the arrangement and orientation of GNPs along the horizontal direction, thereby significantly improving the in-plane thermal conductivity of the composite material. When the maaa fraction of EG is 20%, the thermal conductivity of the EG/PEI composite is 2.38 W?m?1?K?1. Compared with pure PEI, the thermal conductivity increases by about 1224%. The prepared EG/PEI composites are all with high thermal stability and storage modulus recovery rate, it is an ideal thermally conductive material with excellent comprehensive performance.

Key words: Polyimide, Expanded graphite, Composites, Thermal conduction

中图分类号: 

TrendMD: