Abstract
Thermal stability and residual content of traditional silicone rubber at very high temperature are unsatisfactory for thermal insulations. This work used anionic ring-opening polymerization to prepare epoxidized vinyl silicone rubbers with high residual content. Their structures and properties of the rubbers were evaluated. The one with 84% vinyl and 6% epoxy group showed high thermal stability in air. Epoxidized vinyl silicone rubber/carbon fiber/aramid fiber insulators showed a linear ablation rate which met the stringent ablation performance requirements for a solid motor insulation material. In addition, the thermal degradation behavior of the epoxidized vinyl silicone rubbers was investigated in detail. This work provides a strategy to develop insulation materials for solid rocket motors.
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