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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(LiNiO_3/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LiNiO_3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LiNiO_3掺杂量的增加而增加。LiNiO_3/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LiNiO_3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(LiNiO_3/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。
Lithium niobate / polyvinylidene fluoride (LiNiO 3 / PVDF) composite films crosslinked by silane coupling agent 3-aminopropyltriethylsilane were prepared by solution casting. The composite films were tested by IR, XRD, TG, DSC, SEM, dielectric and ferroelectric properties. The results show that insoluble LiNiO 3 particles can be uniformly dispersed into the PVDF matrix to form a β-type crystal phase based composite film, and no obvious agglomeration occurs. The crystallinity and β-type phase content of the composite films can increase with the increase of LiNiO 3 doping amount within a certain range. LiNiO 3 / PVDF composite films show higher dielectric constant and relatively lower dielectric loss. Both dielectric constant and dielectric loss increase with the increasing of LiNiO 3 content and have obvious frequency dependence. Lithium niobate / polyvinylidene fluoride (LiNiO 3 / PVDF) composite films also exhibit better ferroelectric properties than pure PVDF. This study provides an effective method for preparing PVDF-ceramic composite films with good dispersion characteristics.