Synthesis of phenolic resin modified silicone rubber utilizing for ablation thermal protection materials

Phenolic resin modified silicone rubber (PMS) was synthesized via hydrosilation reaction between novolak with allyl group and silicone rubber containing Si-H groups. The chemical structure of PMS was characterized by FT-IR, H-1 NMR and GPC. The thermal stability of PMS was characterized through TGA and compared with traditional single phenyl silicone rubber (PSR). Ablation properties was measured through muffle furnace ablation test. Compared with PSR, the PMS has better thermal stability and wider pyrolysis temperature range. The carbon yield after ablation was promoted greatly and stable ablation layer was obtained.