摘要
采用乳液混合法制备了改性氧化石墨烯(m-GO)包覆的核壳相变复合填料(P@m-GO),并填充于硅橡胶(SIR)基体中得到导热界面材料(P@m-GO/SIR)。主要研究了填料添加量对界面材料热性能和力学性能的影响。结果表明,双增强相变复合填料可以保证界面材料柔顺性,得到的界面材料P@m-GO/SIR具有较高的热导率和潜热值。当添加60 wt.%P@m-GO时,界面材料P@m-GO/SIR的热导率相较纯硅橡胶提高了11倍,为1.248 W·m^(-1)·K^(-1),潜热值可达87.7 J·g^(-1)。同时,界面材料的压缩弹性模量仅为1.01 MPa。
Graphene oxide prepared by the Hummers method was chemically modified by 3-aminopropyltriethoxysilane and spherical paraffin@modified graphene-oxide particles (P@ m-GO) with a core-shell structure were obtained by an emulsion method. P@ m-GO filler/silicone rubber (SIR) matrix composites (P@ m-GO/SIR) were prepared by dispersing different amounts of P@ m-GO in the SIR precursors, followed by curing and were used as thermal interface materials (TIMs). Results indicate that the best TIM had a P@ m-GO loading of 60 wt.% and had both a high thermal conductivity (1.248 W ·m ^-1 ·K ^-1 ) and a high latent heat (88.7 J ·g ^-1 ). Its compression elastic modulus (1.01 MPa) was only one-eighth of that of the pristine SIR (8.16 MPa) due to the plasticity of the paraffin. The paraffin leakage under pressure was low (below 3.98 wt.%) before and after thermal cycling 50 times. These favorable thermal and mechanical properties together with the good cycling stability make it a promising TIM for electronic devices.
作者
冯静
刘占军
张东卿
何钊
陶则超
郭全贵
FENG Jing;LIU Zhan-jun;ZHANG Dong-qing;HE Zhao;TAO Ze-chao;GUO Quan-gui(CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences,Taiyuan 030001, China;University of Chinese Academy of Sciences, Beijing 100049, China)
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2019年第2期188-195,共8页
New Carbon Materials
基金
National Natural Science Foundation of China(51303198)
Youth Innovation Promotion Association of CAS(2017205)~~
关键词
导热界面材料
相变填料
氧化石墨烯
热传导
柔顺性
Thermal interface materials
Phase change fillers
Graphene-oxide
Thermal transfer
Flexibility
