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SFPC课题组导热高分子复合材料研究成果发表在Compos Sci Technol上

Kunpeng Ruan#, Han Yan#, Sijie Zhang, Xuetao Shi*, Yongqiang Guo and Junwei Gu*. In-situ fabrication of hetero-structured fillers to significantly enhance thermal conductivities of silicone rubber composite films. Composites Science and Technology, 2021, 210: 108799. 2019IF=7.094.1区材料科学Top期刊)

https://doi.org/10.1016/j.compscitech.2021.108799

Abstract

With the method of precipitation followed by high temperature calcination, hetero-structured fillers boron nitride nanosheets@alumina (BNNS@Al2O3) were in-situ fabricated. Thereafter, thermally conductive & insulating BNNS@Al2O3/silicone rubber (SR) composite films were then prepared. The “point-surface” hetero-structured fillers BNNS@Al2O3 had more significant thermal conductivity coefficient (λ) improvement than single Al2O3, BNNS and directly blending BNNS/Al2O3 fillers. With the mass fraction of BNNS@Al2O3 to be 30 wt% (BNNS/Al2O3, 1:1, wt:wt), the in-plane λ (λ) and through-plane λ (λ) of the BNNS@Al2O3/SR composite films attained 2.78 W/mK and 0.84 W/mK, 1.75 times higher than λ (1.01 W/mK) and 3.0 times higher than λ (0.21 W/mK) of pure SR, also more excellent than BNNS/SR (λ=2.46 W/mK, λ=0.76 W/mK), Al2O3/SR (λ=1.58 W/mK, λ=0.50 W/mK) and directly blending (BNNS/Al2O3)/SR (λ=2.04 W/mK, λ=0.62 W/mK) composite films under the same mass fraction of fillers. Also, BNNS@Al2O3/SR composite films presented wonderful mechanical, insulation as well as thermal properties.

采用“沉淀-高温煅烧”法原位制备了具有-异质结构的氮化硼纳米片@氧化铝(BNNS@Al2O3)导热填料,进而制备了BNNS@Al2O3/硅橡胶(SR)导热绝缘复合膜。“点-异质结构导热填料BNNS@Al2O3具有较单一Al2O3BNNSBNNS/Al2O3简单共混填料更显著的导热系数(λ)提升效果。当BNNS@Al2O3用量为30 wt%BNNS/Al2O311wtwt)时,BNNS@Al2O3/SR复合膜的面内λλ)和面间λλ)分别达到2.78 W/mK0.84 W/mK,较纯SRλ1.01 W/mK)和λ0.21 W/mK)高出1.75倍和3.0倍,且优于相同填料用量下的BNNS/SRλ=2.46 W/mKλ=0.76 W/mK)、Al2O3/SRλ=1.58 W/mKλ=0.50 W/mK)和(BNNS/Al2O3/SRBNNS/Al2O3简单共混,11wtwtλ=2.04 W/mKλ=0.62 W/mK)复合膜。此外,BNNS@Al2O3/SR复合膜还兼具良好的力学性能、电绝缘性能和热性能。