The surface and cross-section of the PBS and its composites were examined using a scanning electron microscope (SEM). The films were placed on pin stubs and coated with a thin layer of gold in a sputter coater at room temperature (Quorum Technologies Q150R S, Laughton, East Sussex, UK). All micrographs have been taken using a Vega 3 LMU microscope (Tescan, Brno-Kohoutovice, Czech Republic). The SEM analysis was carried out using a tungsten filament with an accelerating voltage of 10 kV.