Abstract
AbstractThis work reports on the mechanical and dielectric properties of waterborne epoxy coatings containing polyaniline/silica nanocomposites (PANi/SiO2). The nanocomposites with different PANi/SiO2 ratios were synthesized by in‐situ chemical oxidative polymerization method. The morphology and electric properties of PANi/SiO2 were examined by field emission scanning electron microscopy (FESEM) and standard four‐probe electrode method. It was shown that the silica nanoparticles were grafted by PANi and it conducted a decrease of electrical conductivity of PANi/SiO2 composites, compared to pure PANi. The epoxy coatings containing PANi/SiO2 presented lower dielectric properties than that containing pure PANi. In contrast, the PANi/SiO2 could maintain the breakdown voltage (from 16.6 to 19.1 kV/mm) and enhance impact resistance of conducting epoxy system up to 100 kg.cm. The results revealed that the PANi/SiO2 nanocomposite can be used in electrical coating application with good dielectric strength and mechanical properties.
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