1：Experimental Design and Method Selection:

The h-BNNPs/PVDF nanocomposite films were prepared via the simple solution casting approach using DMF as a solvent. The concentration of h-BNNPs in the PVDF matrix was varied from 0 to 25 wt%.

2：Sample Selection and Data Sources:

PVDF powder was supplied by Pragati Plastics Private Limited, India. h-BNNPs having an average particle size of ~ 70 nm and N, N-dimethylformamide (DMF) were procured from Sisco Research Laboratories (SRL) PVT. LTD, India.

3：List of Experimental Equipment and Materials:

Olympus BX-53 cross polarizing optical microscope (POM), Carl Zeiss EVO/18SH scanning electron microscope (SEM), Perkin Elmer differential scanning calorimeter (DSC-7), Wayne Kerr 6500B Precision Impedance Analyzer, 8510 C vector network analyzer (VNA).

4：Experimental Procedures and Operational Workflow:

The PVDF powder was dissolved completely in DMF at 60°C for ~ 4 hrs. The h-BNNPs were dispersed independently in DMF via ultrasonication for ~ 30 min. at room temperature. Later, the h-BNNPs/DMF dispersions were poured into the PVDF/DMF solutions and continuously stirred overnight to obtain uniform h-BNNPs/PVDF dispersion. The prepared dispersion was poured on to a Teflon Petri dish and dried in a hot air oven at 60°C for ~ 12 hrs in order to completely evaporate the solvent.

5：Data Analysis Methods:

The dispersion and the distribution of h-BNNPs in the PVDF matrix was evaluated using POM and SEM. The thermal analysis was conducted using DSC. The electrical properties were appraised using Wayne Kerr 6500B Precision Impedance Analyzer. The EMI SE of the h-BNNPs/PVDF nanocomposite films were studied using 8510 C vector network analyzer (VNA).