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采用原位聚合与热亚胺化的方法,成功制备了一系列不同纳米Al_2O_3粒子质量分数的纳米Al_2O_3/聚酰亚胺(PI)复合薄膜。通过SEM、TEM、XRD、FTIR、LCR数字电桥、高压电源及电子万能材料试验机对纳米Al_2O_3/PI复合薄膜的微观结构、介电性能及力学性能进行了表征和测试。结果表明:纳米Al_2O_3粒子在均匀地分散在PI基体中;当纳米Al_2O_3粒子质量分数为8%时,纳米Al_2O_3/PI复合薄膜的击穿强度和拉伸强度均达到了最大值;纳米Al_2O_3/PI复合薄膜的介电常数随纳米Al_2O_3质量分数的增加而增加。
A series of nano-Al 2 O 3 / polyimide (PI) composite films with different mass fractions of Al 2 O 3 particles were successfully prepared by in situ polymerization and thermal imidization. The microstructure, dielectric properties and mechanical properties of nano-Al 2 O 3 / PI composite films were characterized and tested by SEM, TEM, XRD, FTIR, LCR digital bridge, high voltage power supply and electronic universal material testing machine. The results show that nano Al 2 O 3 particles disperse uniformly in PI matrix. The breakdown strength and tensile strength of nano Al 2 O 3 / PI composite films reach the maximum when the mass fraction of nano-Al 2 O 3 particles is 8%. The nano Al 2 O 3 / PI The dielectric constant of the composite film increases with the mass fraction of nano-Al 2 O 3.