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 Dk and Df of P(M-Fa-Si) were 2.68 and 0.00754 (10 MHz), respectively, with excellent low dielectric properties. Its Td,5% (323.12 °C) and Tg (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.