%0 Journal Article %T 阻抗渐变高介电钛酸钡/聚酰亚胺复合薄膜的设计与制备<br>Design and fabrication of high-dielectric BaTiO3/polyimide composite film with impedance gradient %A 吴再辉 %A 秦珊 %A 白帆 %A 吴俊涛 %J 复合材料学报 %D 2016 %R 10.13801/j.cnki.fhclxb.20160128.001 %X 人体皮肤与空气间在介电常数上有着失配性,可穿戴设备所用的材料需要与人体皮肤有良好的匹配性能,而单一的材料与结构已不能满足这种需求。利用原位聚合法合成了一系列钛酸钡(BaTiO3)/聚酰亚胺(PI)混合溶液,通过逐层流延涂覆的方法设计制备了一种具有阻抗渐变性质的多层BaTiO3/PI复合薄膜。结果表明:BaTiO3纳米粒子可在复合薄膜中均匀分散,调节无机粒子的含量,能够有效地控制复合薄膜的介电常数在2.5~34.0之间变化;同时,BaTiO3/PI复合薄膜对外加电场的频率具有不敏感性,也具有良好的力学性能,能够满足可穿戴设备对材料的要求。 The dielectric constant of human skin and air have a large mismatch. The materials used for wearable devices need to have a great matching performance with human shin, which can not be achieved by solo material and structure. By using the in-situ polymerization method, a series of barium titanate (BaTiO3)/polyimide(PI) mixed solutions were synthesized. Then, by means of casting method step by step, a multilayer BaTiO3/PI composite film with impedance gradient was designed and fabricated. The results show that BaTiO3 nano-particles can distribute in the composite film uniformly. By adjusting the content of inorganic particles, the dielectric constant of prepared BaTiO3/PI composite film can be controlled in the range of 2.5-34.0. Besides, BaTiO3/PI composite film is insensible to the frequency of electric field and also has a good mechanical property, which can meet the requirements of wearable device materials. 国家国际科技合作专项(2013DFA31770);国家自然科学基金(51373007,51003004);国家“973”计划(2010CB934700);北京市自然科学基金(2142019) %K 介电梯度 %K 高介电 %K 钛酸钡 %K 聚酰亚胺 %K 复合材料< %K br> %K dielectric gradient %K high-dielectric %K BaTiO3 %K polyimide %K composite %U http://fhclxb.buaa.edu.cn/CN/abstract/abstract13473.shtml