纳米Al_2O_3/聚酰亚胺复合薄膜的介电与力学性能

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。

Dielectric and mechanical properties of nano Al2O3/polyimide composite films

A series of nano Al₂O₃/polyimide (Al₂O₃/PI) composite films with different mass fraction of nano Al₂O₃ particles were successfully prepared via in situ polymerisation and thermal imidization method. The microstructure, dielectric property and mechanical property of nano Al₂O₃/PI composite films were characterized and measured by SEM, TEM, XRD, FTIR, LCR meter, high voltage power and the electronic universal material testing machine. The results show that nano Al₂O₃ particles disperse evenly in the PI matrix. The breakdown strength and tensile strength of nano Al₂O₃/PI composite films both reach a maximum value with nano Al₂O₃ particles mass fraction of 8%. The dielectric constants of nano Al₂O₃/PI composite films increase with the increasing of mass fraction for nano Al₂O₃.