【摘要】 采用纳米AlN作为导热填料,经硅烷偶联剂KH-570表面改性后与环氧树脂(EP)共混制备了导热绝缘胶。通过红外光谱(FT-IR)、接触角方法对改性后纳米AlN进行分析和表征,结果表明,KH-570成功包覆到了纳米AlN表面,粉体由亲水性变为疏水性;对于纳米AlN/EP导热绝缘胶,随着改性纳米AlN填充量的增加,导热率呈上升趋势;当KH-570用量为3.5%、纳米AlN量为20%时,导热率达到0.632W/(m.K),是纯环氧树脂胶的3倍多;此时体积电阻率为2.6×1013Ω.cm,剪切冲击强度为11.9×1015J/m2。更多还原

【Abstract】 With silicane coupling agent of KH-570 modified nano-AlN as thermal conductive filler,thermally conductive insulating adhesive based on epoxy resin was prepared by means of blending.The modified nano-AlN particles were characterized by FT-IR,contact angle respectively.The results showed that the KH-570 was successfully grafted to the surface of nano-AlN by the chemical bond,the surface changed from hydrophilicity to hydrophobicity was improved simultaneously.Thermal conductivity of the nano-AlN/EP adhesive increased with the increase of nano-AlN content.When the mass fraction of KH-570 was 3.5%,simultaneity when the mass fraction of nano-AlN was 20%,the thermal conductivity of the nano-AlN/EP adhesive were up to 0.632W/(m·K) higher 3 times than the pure EP adhesive.Its volume resistance and impact shear strength could reach 2.6×1013Ω and 11.9×1015J/m2 respectively.更多还原