Improved thermal conductivity and breakdown strength of PVDF-based composites by improving the dispersion of BN  

作　　者：Yanxin Li Zhuo Wang Menglei Kong Zhihui Yi 

机构地区：[1]School of Materials Science and Engineering,Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Shaanxi University of Science and Technology,Xi'an,China

出　　处：《High Voltage》2022年第3期595-605,共11页高电压（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:51572160;National Key Research and Development Program of Shaanxi Province,Grant/Award Number:2021GY-224;Graduate Innovation Fund of Shaanxi University of Science and Technology。

摘　　要：In order to adapt to the development of electronic devices,it is necessary to improve the thermal conductivity and breakdown strength of composites.Boron nitride(BN)is an ideal candidate material with high breakdown strength and thermal conductivity.There-fore,the introduction of BN nanosheets into the polyvinylidene fluoride(PVDF)matrix can improve the thermal conductivity and breakdown strength of the composites at the same time.However,BN nanosheets can easily agglomerate in the matrix,which limits the improvement of the properties of the composites.To overcome this difficulty,appropriate water-bath heating was used to improve the fluidity of PVDF.Therefore,the dispersion of the filler is improved.When the volume fraction of BN nanosheets is 3%and the preparation temperature is 45℃,the energy storage density of the compos-ites reached 18.5 J/cm^(3) at 540 kV/mm.At this point,the thermal conductivity was 0.49 W/(m⋅K),3.5 times that of the pure PVDF film.

关 键 词：COMPOSITES CONDUCTIVITY STRENGTH 

分 类 号：TB33[一般工业技术—材料科学与工程]