This work is aimed to use polyaniline (PAni) as the conductive filler with a different weight percentage for the development of the electrical conductivity in poly (3-hydroxybutyrate) (PHB) to apply in the green electronic devices and biomedical application. PHB is brittle, and for this reason, it has mixed with polypropylene carbonate (PPC)/plasticizer (TEC) to improve its toughness and then mixed with PANI/CB to introduce semi-conductive biopolymer. I-V characteristics of the samples were measured and showed ohmic behaviors, and this is apparent as the temperature rises above 50℃. It observed the semiconductivity properties of all samples. It has been found that increasing in PANI concentration in PHB/PPC matrix leads to increase in the value of the AC conductivity, dielectric permittivity (ɛ′) and dielectric loss (ɛ″). The AC conductivity of the PHB blends is improved from 10 to 16 S cm−1 (pure PHB) to 1 S cm−1 (composite 4), and this depends on the PANI concentration. These enhance in the electrical conductivity was due to the improved miscibility between all the components as shown in DSC, the single Tg, and Tm, which was supported too by SEM where PANI/CB is good dispersion in the PHB/PPC matrix.

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Blends of polyamide 6/polystyrene (PA6/PS) (50/50 wt./wt. %) were loaded with different concentrations of boron carbide (B 4 C), (0, 5, 10, 15, 20 and 30 wt./wt. %) separately for EMI shielding. The effects of different weight fractions of fillers on thermal, electrical, as well as, mechanical behavior of the prepared composites were investigated. Thermal stability and hardness (shore D) of composites are studied. Addition of B 4 C enhances thermal stability of the prepared composites which attributed to the increase in physical and chemical cross-linking points, also to the interactions between the filler and polymer blend. Confirmation of thermal stability was done by determining the activation energy (E a) for the thermal decomposition of all composites. Characterization of the prepared composites was done using SEM. With B 4 C-loaded PA6/PS blend composites, samples of 2 mm thick, SE values of 5-36 dB were achieved, satisfying the requirement for common commercial applications.