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通过溶液浇筑法制备了核-壳结构的硅烷偶联剂3-氨丙基三乙氧基硅烷(3-APTS)交联的SrTiO_3/PVDF复合物薄膜,对其进行了XRD、FTIR、TG、DSC、SEM、介电和铁电性能测试。研究发现,使用硅烷偶联剂有助于SrTiO_3在复合物薄膜中实现均匀分散,其可能与硅烷偶联剂可以被用作交联剂连接聚合物和无机材料形成核-壳结构有关。SrTiO_3(ST)的引入有助于提高复合物薄膜的结晶性,但是会导致电活性β-晶相含量的轻微减少。当ST的质量含量达到30%时,复合物薄膜的介电常数可以增大至纯PVDF的2.5倍,并且不会引起介电损耗的明显增加;同时,该复合物薄膜的剩余极化率(Ps)也可以增大到原来的2倍左右。我们的研究表明,在PVDF中引入硅烷偶联剂表面改性的ST是制备具有良好分散性的复合物薄膜以及提升其铁电和介电性能的一种有效方法。
The three-aminopropyltriethoxysilane (3-APTS) cross-linked SrTiO_3 / PVDF composite was prepared by solution pouring method. The XRD, FTIR, TG, DSC, SEM, dielectric and ferroelectric properties testing. The study found that the use of silane coupling agent helps SrTiO_3 in the composite film to achieve uniform dispersion, which may be used as a silane coupling agent to connect polymers and inorganic materials to form a core-shell structure. The introduction of SrTiO_3 (ST) helps to increase the crystallinity of the composite film, but leads to a slight decrease in the content of electroactive β-crystalline phase. When the mass fraction of ST reaches 30%, the dielectric constant of the composite film can be increased to 2.5 times that of pure PVDF without any significant increase of dielectric loss. At the same time, the remanent polarizability ( Ps) can also be increased to about 2 times the original. Our research shows that the introduction of silane coupling agent surface-modified STF in PVDF is an effective method to prepare composite films with good dispersibility and improve their ferroelectric and dielectric properties.