聚酰亚胺/钛酸钡复合膜介电性能及其影响因素的研究

Study of the dielectric properties of polyimide/barium titanate composites and its influence factors

通过硅烷偶联剂改性的BaTiO3粒子与聚酰胺酸溶液共混成膜、亚胺化后制备出高介电常数聚酰亚胺/BaTiO3复合膜。考察了BaTiO3粒子的体积分数、粒径大小、偶联剂的种类与用量、频率等对介电性能的影响。研究发现,通过使用偶联剂对BaTiO3粒子进行表面改性、增加粒子的粒径都可以有效提高复合膜的介电常数,膜的介电常数随BaTiO3粒子的体积分数的增加而增加,由粒径为100nm改性Ba-TiO3制备的复合膜,BaTiO3的体积分数为0.5时,膜在10kHz电场中的介电常数达到35。

A series of polyimide/barium titanate composite films were successfully prepared through blending barium titanate particles modified with silane modified coupling agent,and imidization.The influence of volume fraction and size of particle size,amount of coupling agent and frequency of field on dielectric properties were studied.Results revealed that the dielectric constant（ε） of the composite film increased for the systems using modified and larger-sized particles.With increase of the volume fraction of BaTiO3 particles,the e value increased gradually.For the composite film containing 50vol% of BaTiO3 with size in 100nm,the dielectric constant reached to 35 at 10kHz.