咪唑-银修饰BN填充环氧树脂导热绝缘复合材料  

Thermal conductive and insulating epoxy composites filled with imidazole-silver modified BN

作　　者：杨李懿 葛凡 汪蔚 李艳飞 马苗 冉涛 YANG Liyi;GE Fan;WANG Wei;LI Yanfei;MA Miao;RAN Tao(Jiaxing University,Jiaxing 314001,China;Zhejiang Rongtai Technical Industry Co.,Ltd.,Jiaxing 314007,China)

机构地区：[1]嘉兴大学,浙江嘉兴314001 [2]浙江荣泰科技企业有限公司,浙江嘉兴314007

出　　处：《绝缘材料》2024年第6期17-22,共6页Insulating Materials

基　　金：浙江省基础公益研究计划项目(LGG19E030006)

摘　　要：环氧树脂(EP)已经广泛应用于电气绝缘材料,但其导热系数较低,越来越难以适应现代高功率密度电气设备的散热需求。本文在氮化硼(BN)表面沉积醋酸银(AgAc)和2-乙基-4-甲基咪唑(2E4MI)络合物,制备咪唑-银修饰BN杂化材料(Ag(2E4MI)_(2)Ac@BN),用其填充EP制得Ag(2E4MI)_(2)Ac@BN/EP复合材料,随后研究其导热性能。结果表明:当填料体积分数为20%时,Ag(2E4MI)_(2)Ac@BN/EP复合材料的导热系数为1.72 W/(m·K),比BN/EP复合材料的导热系数(0.96 W/(m·K))提高了79.2%。Monte Carlo法模拟表明:在EP基体中,Ag(2E4MI)_(2)Ac@BN的接触热阻R_(c)=2.7×10^(6)K/W,低于BN的R_(c)(5.5×10^(6)K/W)。与BN/EP复合材料相比,Ag(2E4MI)_(2)Ac@BN/EP复合材料的拉伸强度及介质损耗因数(tanδ)增加,电气强度及体积电阻率降低,但仍保持较高电绝缘性能。Epoxy resin(EP)has been widely applied in electrical insulating materials,but with a low thermal conductivity,it cannot meet the requirement of heat dissipation in modern electrical equipment with high-power density.In this paper,silver acetate(AgAc)and 2-ethyl-4-methylimidazole(2E4MI)complex was deposited on boron nitride(BN)surface to prepare imidazole-silver modified BN hybrid materials(Ag(2E4MI)_(2)Ac@BN),then Ag(2E4MI)_(2)Ac@BN was filled in EP to prepare Ag(2E4MI)_(2)Ac@BN/EP composites,and its thermal conductivity was studied.The results show that when the volume fraction of filler is 20%,the thermal conductivity of Ag(2E4MI)_(2)Ac@BN/EP composites is 1.72 W/(m·K),which is 79.2%higher than that of BN/EP composites(0.96 W/(m·K)).The results of Monte Carlo simulation show that in the EP matrix,the thermal contact resistance(Rc)of Ag(2E4MI)_(2)Ac@BN is 2.7×10_(6) K/W,which is lower than the that of BN(R_(c)=5.5×10_(6) K/W).In comparison with BN/EP composites,Ag(2E4MI)_(2)Ac@BN/EP composites exhibit higher tensile strength and dielectric loss tangent(tanδ),lower dielectric strength and volume resistivity,while maintain good electrical insulating properties.

关 键 词：复合材料 环氧树脂 BN 导热 绝缘 

分 类 号：TM215[一般工业技术—材料科学与工程]