3-氨基丙基三乙氧基硅烷交联的铌酸锂/聚偏氟乙烯复合物薄膜的制备与性能研究

摘要

通过溶液浇铸法制备了经硅烷偶联剂3-氨丙基三乙基硅烷交联的铌酸锂/聚偏氟乙烯(LiNiO3/PVDF)复合薄膜.对复合薄膜进行了IR、XRD、TG、DSC、SEM、介电和铁电性能测试.结果表明,不溶性LiNiO3颗粒能够被均匀分散到PVDF基质当中,形成β型晶相为主的复合物薄膜,没有产生明显的团聚现象.复合物薄膜的结晶度和β型晶相含量可以在一定范围内随LiNiO3掺杂量的增加而增加.LiNiO3/PVDF复合薄膜显示出了较高的介电常数和相对较低的介电损耗.介电常数和介电损耗都随着LiNiO3含量不断增加而增加,并且具有明显的频率依赖特性.铌酸锂/聚偏氟乙烯(LiNiO3/PVDF)复合薄膜也表现出比纯PVDF更好的铁电性能.本研究提供了一种制备具有良好分散特性的PVDF-陶瓷复合物薄膜的有效方法.%A LiNbO3/PVDF composite film cross-linked with silane coupling agent 3-aminopropyltriethoxysilane (3-APTS) was prepared by solution casting method.The prepared composite films were characterized by IR,XRD,TG,DSC,SEM dielectric and ferroelectric test.The results indicated that insoluble LiNbO3 particles could be evenly distributed throughout PVDF matrix to form β-phase dominated PVDF composite films without obvious agglomeration.The crystallinity and β-phase content could increase with increasing doping content of LiNbO3 within a certain range.LiNbO3/PVDF composite film exhibited improved dielectric constants and relatively low dielectric loss.Both dielectric constants and dielectric loss were frequency dependent and gradually increased with increasing LiNbO3 content.LiNbO3/PVDF composite film also exhibited better ferroelectric properties than pure PVDF.This paper provided a useful way to prepare well-dispersed PVDF-ceramic composite film.