Thermal Behavior and Ignition Performance of Silicon‐Based Core Shell Composite Si@PVDF/AP Fabricated by Spray‐Drying Method

To enhance the combustion performance of nano silicon powder, a core–shell Si@PVDF/AP composite was fabricated via spray‐drying. Its morphology and elemental distribution were examined by scanning electron microscopy (SEM)‐EDS. Thermal behavior and sensitivity were evaluated using DSC‐TG and compared with a physically blended Si/PVDF/AP composite. Kinetic analyses employing the Kissinger method indicated that the activation energy of the composite reached up to 285.44 kJ·mol − 1 , which was significantly higher than the value obtained for the physical mixture (up to 132.92 kJ·mol − 1 ) using the same method. Shock wave ignition tests demonstrated shorter ignition delays and superior combustion efficiency for the core–shell material. Furthermore, Si@PVDF/AP exhibited markedly improved safety characteristics, with impact sensitivity > 100 cm and friction sensitivity 56%, in contrast to 25.12 cm and 100% for the physical blend. These findings confirm that the Si@PVDF/AP composite achieves simultaneously enhanced combustion performance, higher thermal stability, and improved safety.