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Functionalized silica sols were obtained by the hydrolytic condensation  of  (γ-methacryloxypropyl)trimethoxysilane (MPMS),  (γ-glycidyloxypropyl)trimethoxysilane (GPMS) and tetraethoxysilane  (TEOS). Three different sols were obtained: MPS (derived from MPMS and  TEOS), GPS-MPS (derived from GPMS, MPMS and TEOS), and GPSD (derived  from GPMS, TEOS and diglycidyl ether of bisphenol A, DGEBA). These  silica sols were mixed with a phenolic resin (PR). Ethylenediamine was  used as a hardener for epoxy-functionalized sols and benzoyl peroxide  was used as an initiator of the free-radical polymerization of  methacrylate-functionalized silica sols. Glass fiber-reinforced  composites were obtained from the neat PR and MPS-PR, GPS-MPS-PR and  GPSD-PR. The resulting composites were evaluated as ablation resistant  materials in an acetylene-oxygen flame. A large increase in the ablation  resistance was observed when the PR was modified by the functionalized  silica sols. The ablation resistance of the composites decreased as  follows: GPSD-PR > MPS-PR > GPS-MPS-PR > PR

polymers

Modification of a Phenolic Resin with Epoxy- and Methacrylate-Functionalized Silica Sols to Improve the Ablation Resistance of Their Glass Fiber-Reinforced Composites