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Enhancement of the dielectric performance of PA11/PVDF blends by a solution method with dimethyl sulfoxide

Abstract In this study, the solution method was used to prepare polyamide 11/polyvinylidene difluoride (PA11/PVDF) blend films. The crystal phase compositions and microstructures of the blends were studied by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy analysis. Additionally, the dielectric properties of the PA11/PVDF blends, with different ratios and concentrations, were tested. The results indicated that the solution method is more propitious in forming β crystals during the preparation of the PA11/PVDF blend films compared with the melt blending method. The amount of β crystals present in PVDF was dependent on the ratio of dimethyl sulfoxide (DMSO) and H2O. Specifically, for the 5:95 ratio of DMSO/H2O precipitants, the PA11/PVDF (80:20) blend films prepared by the solution method had a high dielectric constant of 188.1 and a dielectric loss of 1.37.