聚醚砜-双马来酰亚胺/超临界Al_2O_3复合材料的介电性能研究

Study on Dielectric Property of PES-MBAE/SCE-Al_2O_3 Composite

以4,4′-二氨基二苯甲烷双马来酰亚胺(MBMI)为基体、3,3′-二烯丙基双酚A(BBA)和双酚A双烯丙基醚(BBE)为活性稀释剂制备基体(MBAE),以聚醚砜(PES)为增韧剂,以超临界乙醇处理的Al_2O_3(SCE-Al_2O_3)为改性剂,采用原位聚合法制备了PES-MBAE/SCE-Al_2O_3复合材料,并对其微观形貌及性能进行测试与分析。结果表明:该材料是一种多相复合材料,SCE-Al_2O_3可以均匀的分散在基体中,对材料有明显的增韧效果。当SCE-Al_2O_3的质量分数为3%,PES的质量分数为5%时,复合材料的介电常数为3.71(100 Hz),介质损耗角正切为1.6×10^(-3)(100 Hz),体积电阻率为4.87×10^(15)Ω·m,电气强度为14.9 k V/mm,是一种理想的绝缘材料。

Using 4,4＇-diaminodiphenyl methane bismaleimide （MBMI） as matrix and 3,3＇-diallyl bisphenol A （BBA） and bisphenol-A diallyl ether （BBE） as reactive diluents to prepare matrix （MBAE）, polyether sulfone （PES） as toughening agent, and supercritical ethanol treated A1203 （SCE-A1203） as modifying agent, we prepared a PES-MBAE/SCE-A1203 composite through in-situ polymerization method. Its morphology and dielectric property were analyzed. The results show that the material is a kind of multiphase composite. The SCE-AhO3 could well disperse in the matrix and has obvious toughening effect for the composite. When the mass fraction of SCE-AhO3 and PES is 3% and 5%, respectively, the dielectric constant of the composite is 3.71 （100 Hz）, the dielectric loss is 1.6×10^-3 （100 Hz）, the volume resistivity is 4.87×10^15 Ω·m, and the electric strength is 14.9 kV/mm, which indicate that the composite is a kind of ideal insulating material.