Temperature and frequency dependence of dielectric relaxation in a metal–organic perovskite-like framework

A comparison of shear‐mixing and solvent‐induced on phase behavior, thermal and dielectric properties of PVDF‐HFP/MOF composites

“…PVDF‐HFP composite films presented the obvious indication of the in situ formation of HImMg fillers in the PVDF‐HFP matrix. The characteristic peak with a monoclinic structure of HImMg was assigned at 2 θ = 14.1°, 14.5°, 20.6°, 23.0°, 24.7°, 25.2°, 26.8°, 28.4°, 29.1°, 29.4°, 37.4°, 41.7°, 43.2°, 44.3°, and 44.7°, as presented in Figure S2 19 . In both prepared methods, the peak intensity of diffraction angle 2 θ for HImMg fillers apparently increased with increasing filler content.…”

“…The semicrystalline pure PVDF-HFP using melt-mixing and solution-casting methods showed the characteristic peaks of the nonpolar α-phase at 2θ = 17.7 , 18.3 , 19.9 , 26.6 , 35.9 , and 38.8, which corresponded to the (100), (020), ( 110 S2. 19 In both prepared methods, the peak intensity of diffraction angle 2θ for HImMg fillers apparently increased with increasing filler content. In addition, the weak peak corresponding to the β-phase crystal appeared at 2θ = 20.3 (110/200) in composite films.…”

“…On the basis of the above discussions, we prepared (C 3 N 2 H 5 )(Mg[HCOO] 3 ), HImMg, according to previous work 19 and added HImMg particles uniformly in the PVDF‐HFP matrix using two different methods: melt‐mixing and solution‐casting. The phase behavior, surface morphologies, and thermal and dielectric properties of PVDF‐HFP composites were investigated further.…”

“…Another technique is to use nanofillers to transform PVDF's α-crystal phase to β-crystal phase, which improved the ferroelectric and dielectric properties of PVDF composites such as microporous zirconium-based MOFs, 13 Nd-doped BaTiO 3 nanoparticles, 15 halloysite, 16 Li 1+ , Al 3+ , 17 and cetyltrimethylammonium bromide. 18 On the basis of the above discussions, we prepared (C 3 N 2 H 5 )(Mg[HCOO] 3 ), HImMg, according to previous work 19 and added HImMg particles uniformly in the PVDF-HFP matrix using two different methods: meltmixing and solution-casting. The phase behavior, surface morphologies, and thermal and dielectric properties of PVDF-HFP composites were investigated further.…”