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“点-面”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-面”异质结构导热填料BNNS@Al2O3具有较单一Al2O3、BNNS和BNNS/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/Al2O3，1：1，wt：wt）时，BNNS@Al2O3/SR复合膜的面内λ（λ∥）和面间λ（λ⊥）分别达到2.78 W/mK和0.84 W/mK，较纯SR的λ∥（1.01 W/mK）和λ⊥（0.21 W/mK）高出1.75倍和3.0倍，且优于相同填料用量下的BNNS/SR（λ∥=2.46 W/mK，λ⊥=0.76 W/mK）、Al2O3/SR（λ∥=1.58 W/mK，λ⊥=0.50 W/mK）和（BNNS/Al2O3）/SR（BNNS/Al2O3简单共混，1：1，wt：wt，λ∥=2.04 W/mK，λ⊥=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。
