采用原位聚合法制备聚酰亚胺/氮化硼(PI/BN)复合材料,并对其进行表征分析。通过一系列不同偶联剂、催化剂含量等合成参数的优化,得到最佳性能的薄膜。采用称重法对薄膜的亚胺化及固化程度进行测定,黏度法对聚合物分子量的测定,使用FTIR,DSC和TG对单体、制备过程及最终复合材料的结构和热性能进行表征分析。结果表明,聚酰亚胺复合薄膜中无机组分的加入不仅能使薄膜的强度提高,热性能也明显提高。 Polyimide / boron nitride (PI / BN) composites were prepared by in situ polymerization and characterized. Through a series of different coupling agents, catalyst content and other synthetic parameters optimized to obtain the best performance of the film. The degree of imidization and the degree of curing were measured by weighing method. The molecular weight of polymer was measured by viscosity method. The structure and thermal properties of monomer, preparation process and final composites were characterized by FTIR, DSC and TG. The results show that the addition of inorganic components in the polyimide composite film can not only increase the strength of the film, but also significantly improve the thermal properties.