片状纳米Al2O3/环氧树脂复合材料的制备及性能

采用水热法制备片状纳米Al₂O₃,经过偶联剂改性后与环氧树脂复合,通过溶液混合法制备了不同填充量的片状纳米Al₂O₃/环氧树脂复合材料,研究了片状纳米Al₂O₃用量对片状纳米Al₂O₃/环氧树脂复合材料介电性能和热性能的影响,利用SEM对复合材料的断口形貌进行了表征。结果表明: 片状纳米Al₂O₃在环氧树脂基体中分散良好;随着片状纳米Al₂O₃填充量的增加,复合材料的起始热分解温度升高、介电强度增大,当片状纳米Al₂O₃的填充量为7wt%时,复合材料的介电强度为 29.58 kV/mm,比纯环氧树脂的介电强度提高了30%;复合材料的介电常数(3.8~4.5)和介电损耗(0.015)比纯环氧树脂稍有增大,但仍维持在较好的介电性能范围内。

Preparation and properties of Al2O3 nanosheets/epoxy composites

Al₂O₃ nanosheets were successfully synthesized by hydrothermal process.After modified with coupling agent, Al₂O₃ nanosheets/epoxy composites with different contents of Al₂O₃ nanosheets were prepared by solution mixing.The effects of Al₂O₃ nanosheet content on the dielectric and thermal properties of Al₂O₃ nanosheets/epoxy composites were discussed.The fracture morphology of composites was characterized by SEM.The results show that Al₂O₃ nanosheets uniformly disperse in epoxy matrix.With the increase of Al₂O₃ nanosheet content, the initial thermal decomposition temperature and the dielectric strength of Al₂O₃ nanosheets/epoxy composites increase.Dielectric strength of composites is 29.58 kV/mm with 7wt% Al₂O₃ adding, which is increased by 30% than that of the pure epoxy.Dielectric constant (3.8-4.5) and dielectric loss (0.015) of Al₂O₃ nanosheets/epoxy composites increase slightly than pure epoxy's, but the dielectric properties still remain at a good level.