Abstract
Zinc oxide particles in needle shape were synthesized by hydrothermal route varying the reactor rotation speed (600, 1200, and 1800 rpm). The synthesized particles and commercial nanosized ZnO were characterized through X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FTIR), and scanning electronic microscopy (SEM), aiming to evaluate the influence of the synthesis variable on their thermal, morphological and chemical properties. In this study, the performance of composites comprising poly(vinylidene fluoride) (PVDF) matrix and ZnO synthesized particles, and commercial nanoparticles were compared. The composites were analyzed by XRD, TGA, FTIR, SEM, dynamic-mechanical analysis (DMA), and permeability to CO2. The results revealed that the particles synthesized even in micrometric diameter reduced the permeability much more than the commercial ZnO nanoparticles, therefore being more suitable for the application as inner pressure sheath in flexible ducts. Moreover, the ZnO needle-like particles with a lower dimension induced the PVDF β-phase to over 30%.
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