IMF2017

A piezoelectric composite is growing in various applications. Generally, metal-organic frameworks (MOFs) with perovskite-like structure, ABX₃, [(C₃N₂H₅)(M(HCOO)₃)] with M= Mn²⁺ and Mg²⁺, were provided as an appropriate filler to enhance the dielectric constants of composites. Synthesis of [(C₃N₂H₅)(Mn(HCOO)₃)] (ImMn) and [(C₃N₂H₅)(Mg(HCOO)₃)] (ImMg) were prepared using a solution diffusion method at room temperature. TGA technique was performed under N₂ atmosphere and temperatures ranging from 30 - 800 ^oC. Two weight loss steps were observed the removal of imidazolium and M(Mn²⁺ and Mg²⁺)(HCOO)₂. Morphology observed from SEM of each MOFs depend on type of metal ion. ImMn exhibits the polygon-like structure while ImMg clearly shows cubic-like structure. Frequency dependent dielectric properties was measured in the range of 10 kHz – 1 MHz. Dielectric constants of ImMg was higher than that of ImMn. However, brittleness and difficult to process limited its application. Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/MOFs composites were fabricated by mixing in brabender and pressing in compression mold. The increment in β-phase crystalline presented with higher amount of MOFs. The dielectric constant showed that the values of composite film were enhanced from 37 of neat PVDF-HFP to 43 with 5 wt.% of ImMn. To further investigate the piezoelectric properties of the PVDF-HFP/MOFs composite, the type of MOFs and volume fraction of MOFs are also optimized.