Novel hybrid silicone resin composites with excellent low dielectric and high temperature mechanical properties

With the development of aerospace technology, the temperature resistance of traditional silicone resins fails to satisfy the ever-increasing demand from the stringent application conditions. In this paper, we used diphenyl sulfide (TBSP), diphenyl sulfoxide (SIBSP), and diphenyl sulfone (SODP) to modify the main chain of SiR by hydrolysis-condensation and prepared the quartz fiber reinforced SiR composites. The mechanical properties of [email protected] composites were measured, and the effects of temperature on the mechanical properties were investigated. Compared with QF/SiR, the ILSS and bending strength of QF/[email protected] composites enhanced from 15.58 MPa to 183.59 MPa–25.36 MPa and 338.37 MPa at room temperature. Moreover, at 500 °C, the ILSS and bending strength of QF/[email protected] were 11.87 MPa and 114.37 MPa, representing an enhancement of 514% and 315% compared with SiR composite. The structural, heat resistance and composition changes of the composites were determined by SEM, TG and IR, and the failure mechanism of the composites at high temperature was elucidated.