Cattail-Biomimetic Biobased Organosilicon Composite with Excellent Low Dielectric, Anticorrosion, And Greatly Improved Thermal and Mechanical Properties

The rapid development and multiapplication scenarios (such as marine communication) of communication technology demand higher-performance interlayer dielectric materials. A poly(benzoxazine)-modified organosilicon composite (P(M-Fa-Si)) was prepared from renewable magnolol. The binding energy of a single poly(benzoxazine) and a single organosilicon link was calculated by DFT to be -3.99 eV, indicating good compatibility. Surprisingly, P(M-Fa-Si) with a cattail-biomimetic micronanostructure had a water contact angle of 127.1° (vs 103.2° for P(EM-Si)). Given its unique surface morphology and high cross-linking density (4.79 × 10⁴ mol/m³), P(M-Fa-Si) achieved 99.84% copper protection, 2.21 × 10⁰⁷ Ω·cm² impedance after a 20-day corrosion, showing excellent anticorrosion. The <i>D</i>_k and <i>D</i>_f of P(M-Fa-Si) were 2.68 and 0.00754 (10 MHz), respectively, with excellent low dielectric properties. Its <i>T</i>_d,5% (323.12 °C) and <i>T</i>_g (129.52 °C) exceeded P(EM-Si) (236.82 °C, 73.89 °C), and its tensile/flexural/impact strengths were over 5× higher. This biobased composite expanded sustainable polymer use in electronics and guided high-performance material design.