Abstract
ABSTRACTFlexible layer–layer poly(ethylene phthalate) (PET)/BaTiO3 composite films with enhanced dielectric permittivity were fabricated by spin coating method, consisting of PET substrate film layer and modified BaTiO3/acrylic resin hybrid coating layer. The thickness of coating layer was less than 3 μm (about 2% of PET film thickness), and therefore, the PET/barium titanate (BT) composite films remained flexible even at high volume fraction of BaTiO3 fillers. The volume contents of BaTiO3 were varied from 0 to 80%, and the solid contents of BaTiO3/acrylic resin were in the range of 51.8–72.9%. Scanning electron microscopy showed strong interaction of finely dispersed BaTiO3 particles with acrylic resin. Morphological profile also displayed uniform coating layer of modified BaTiO3/acrylic resin and its strong adhesion with PET film. The dielectric constant of the PET/BaTiO3 composite films increased by about 26% at 60 vol % BaTiO3 loading when compared with the pristine PET film, whereas the dielectric loss decreased slightly. In addition, PET‐grafted poly(hydroxylethyl methacrylate) brushes were used as substrate to introduce covalent bonding with the coating layer. Further enhancement of dielectric constant and reduction of dielectric loss were realized when compared with the composite films with bare PET substrate. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42508.
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