Force‐Driven In Situ Growth of Nanostructured Silica Fillers in Polyetherimide Nanocomposites

(200 °C) with an energy efficiency exceeding 90%, outperforming existing dielectric nanocomposites fabricated via conventional methods. The force-driven growth of nanostructured inorganic fillers within polymer matrices proposes a facile and universal approach for developing high-performance polymer nanocomposites with multi-functionality.