磷酸铝-聚醚砜层状复合材料的隔热及介电性能

Thermal insulation and dielectric properties of aluminium phosphatepolyethersulphone layered composites

采用高温煅烧成型工艺在聚醚砜(PES)基体表面复合了AlPO4耐热层,制备得到了AlPO4-PES层状复合材料。利用SEM、激光共聚焦显微镜三维形貌分析(CLSM-3D)、FTIR和TGA等分析技术对AlPO4-PES微观结构、化学成分以及热稳定性进行了表征。研究了AlPO4含量对AlPO4-PES层状复合材料的热导率和介电性能的影响。结果表明:AlPO4层显著地改变了PES基体的微观结构,二者之间通过物理方式紧密结合;随着AlPO4含量的增加,AlPO4-PES层状复合材料的热稳定性明显增强,而热导率却不断降低;AlPO4-PES层状复合材料的介电常数和介电损耗均随着AlPO4含量的增加而减小,并且在0.1~5MHz测试范围内表现出良好的频率稳定性。

The heat resistant layer of aluminium phosphate（AlPO4）was prepared on the surface of polyethersulphone（PES）matrix using the high temperature calcination molding process.The microstructure,chemical component and thermal stability of AlPO4-PES layered composites were characterized by techniques of SEM,confocal laser scanning microscopy-three dimensional morphology analysis（CLSM-3D）,FTIR and TGA.The influence of AlPO4 content on the thermal conductivity and dielectric property of AlPO4-PES layered composites was investigated.The results show that the incorporation of AlPO4 leads to significant changes on the microscopic structure of PES matrix.And heat resistant layer of AlPO4 and PES matrix are combined together via physical way.The thermal stability of AlPO4-PES layered composites is obviously enhanced with increasing the AlPO4 content,while the thermal conductivity of composites is decreased continuously.As the AlPO4 content increases,both the dielectric constant and dielectric dissipation of AlPO4-PES layered composites are reduced,and they exhibit excellent frequency stability in the test range of 0.1-5 MHz.