Multiple synergistic effects of graphene-based hybrid and hexagonal born nitride in enhancing thermal conductivity and flame retardancy of epoxy

被引:159
作者
Feng, Yuezhan [1 ,2 ]
Han, Gaojie [1 ]
Wang, Bo [1 ]
Zhou, Xingping [2 ]
Ma, Jianmin [3 ]
Ye, Yunsheng [2 ]
Liu, Chuntai [1 ]
Xie, Xiaolin [2 ]
机构
[1] Zhengzhou Univ, Natl Engn Res Ctr Adv Polymer Proc Technol, Key Lab Mat Proc & Mold, Minist Educ, Zhengzhou 450002, Henan, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Chem & Chem Engn, Key Lab Mat Chem Energy Convers & Storage, Minist Educ, Wuhan 430074, Hubei, Peoples R China
[3] Hunan Univ, Sch Phys & Elect, Key Lab Micro Nano Optoelect Devices, Minist Educ, Changsha 410022, Hunan, Peoples R China
基金
美国国家科学基金会; 中国博士后科学基金;
关键词
Synergistic effect; Hexagonal boron nitride; Graphene-based hybrid; Thermal conductivity; Flame retardancy; CARBON NANOTUBES; MULTILAYER GRAPHENE; SMOKE TOXICITY; COMPOSITES; ENHANCEMENT; NANOSHEETS; OXIDE; SUPPRESSION; RESISTANCE; PHOSPHORUS;
D O I
10.1016/j.cej.2019.122402
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The heat shock, thermal aging and fire hazard of induced by delayed heat diffusion in microelectronic devices require a high-efficiency thermal management system with high-performance electronic packaging materials. In this work, the significant thermal conductivity and flame retardancy of polymer-based thermally conductive composites (PTCs) are addressed by multiple synergistic effects of hexagonal born nitride (hBN) and few flame-retardant functionalized graphene. Briefly, a multifunctional hydrophilic graphene-based hybrid containing Ni (OH)(2) nanoribbons and reduced graphene oxide (RGO) was synthesized by two-step hydrothermal process. The resulted RGO@Ni(OH)(2) hybrid and hBN sheets (lateral size of 4.37 +/- 1.68 mu m and thickness of 80 +/- 21 nm) used as synergistic and main fillers, respectively, was simultaneously added into EP matrix. As expected, the binary fillers showed multiple synergistic effects for improving the thermal conductivity and flame retardancy of composites. Typically, the good dispersion and interfacial interaction of RGO@Ni(OH)(2) hybrid in matrix can not only inhibit the stacking aggregation behavior of hBN sheets, but also bridge adjacent hBN sheets, both of which resulted in a high thermal conductivity (2.01 W/mK) of ternary composites with a synergistic increment of 39.4% comparing to EP/hBN. On the other hand, their synergistic flame retarding effect including catalytic carbonization, endothermic action and barrier effect induced by RGO@Ni(OH)(2), as well as "tortuous path" effect of hBN sheets, jointly led to the formation of a compact and robust char layer in condensed phase during combustion. As a result, EP/hBN/RGO@Ni(OH)(2) exhibited a desired flame ratardancy with considerable reductions being seen in peak heat release rate, total heat release and total smoke production, i.e., 33.5%, 33.8% and 43.0% comparing to neat EP.
引用
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页数:13
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