Polymer-ceramic composite films: Microstructural and Electric characterizations

Reference	Presenter	Authors (Institution)	Abstract
03-045	Diogo Eduardo Eunice de Souza	Souza, A.E.(Universidade Estadual Paulista); Eunice de Souza, D.E.(Universidade Estadual Paulista); Rubira, R.J.(Universidade Estadual Paulista); Santos, J.A.(Universidade Estadual Paulista); Sanches, A.O.(Universidade Estadual Paulista - Faculdade de Engenharia de Ilha Solteira); Teixeira, S.R.(Universidade Estadual Paulista); Cardoso, C.X.(Universidade Estadual Paulista);	Composite films of PVDF with zirconate ceramic nanoparticles (BaZrO3, CaZrO3, SrZrO3) were developed. Ceramic powders was prepared by the microwave-assisted hydrothermal method, mixing Ba, Ca or Sr and Zr chlorides with mineralizer (KOH 6M). The mixture was placed in a Teflon cup, taken to the microwave oven at 140°C/min, 140°C for 80min. After drying, 10wt% of the each ceramic powder was added in PVDF dissociated in dimethylformamide under mechanical agitation for 4 hours. The compound was transferred to Petri plates, taken in an oven at 80°C to remove the solvent and obtain the film. The PVDF was characterized by simultaneous thermal analysis (TG, DSC e DTA). The films were characterized by X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infra-red spectroscopy (FTIR), Scam electron microscopy (SEM) and Impedance spectroscopy. The TG and DSC of PVDF show that the polymer is thermally stable up to ~450°C, from which material degradation begins up to ~600°C (exothermic reaction peak). XRD results of three film samples (10%BZ-PVDF; 10%CZ-PVDF and 10%SZ-PVDF) show that PVDF has structure in ?-phase, with peak around 2?=20°. With the 10wt% ceramic addition, it is verified, to all film, that the ceramic powder overlaps the PVDF peak, indicating the composite formation. Raman data showed ceramic powders and the polymer vibrational bands characteristic, indicating good homogeneity of the films. The FTIR results showed the bands presented for the PVDF sample are ?-PVDF characteristic vibrational modes. These bands are not altered with the ceramics addition, since the vibrational modes of these compound occur in different regions. SEM images show different morphologies for each ceramic composite added to PVDF, however, all the film samples presented homogeneous ceramic-polymer distribution. Impedance results showed different capacitance values for the three films. The 10%SZ-PVDF sample presented the best results, reaching 1.8E-11F (0.1MHz) values.
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