Silicon-Containing Hydrocarbon Polymers Prepared via Hydrosilylation Exhibiting Ultralow Dielectric Loss from 10 GHz to 75 GHz

With the rapid advancement of high-frequency communication technologies, the demand for advanced insulating materials with minimal dielectric losses has become increasingly critical. In this work, silicon-containing hydrocarbon polymers were synthesized through hydrosilylation polymerization between dihydrosilanes and diynes or dienes, strategically designed to achieve both a low dielectric constant (D_k) and an ultralow dielectric loss tangent (D_f). The polymerization proceeded efficiently under mild conditions, yielding high-purity polymers without by-product formation. The resulting materials exhibited outstanding dielectric properties, with D_k values of ~2.6 and D_f values below 0.002 at 20 GHz, the latter of which reached as low as 0.0011 in optimized systems. Notably, these excellent characteristics were maintained even at frequencies exceeding 75 GHz. Thermogravimetric analysis revealed superior thermal stability, with 10% weight-loss temperatures (T_d-10) surpassing 400 ℃. Furthermore, the polymers displayed excellent solubility in a wide range of organic solvents (excluding alcohols), ensuring favorable practical processability. Collectively, these findings demonstrate the potential of the synthesized materials as next-generation interlayer dielectrics for high-speed and high-frequency communication devices.