Thermostable Polycyanurate-Polyhedral Oligomeric Silsesquioxane Hybrid Networks: Synthesis, Dynamics and Thermal Behavior

A series of hybrid polycyanurate ‐ epoxy cyclohexyl‐functionalized polyhedral oligomeric silsesquioxane (PCN/ECH‐POSS) nanocomposite networks with ECH‐POSS content varying from 0.025 to 10 wt. % were synthesized and characterized using FTIR, DSC, DMA and CRS techniques. It was revealed that already as low as 0.025 wt. % POSS cardinally changed PCN glass transition characteristics including the strong shift of the transition onset to higher temperatures and manifesting a second, higher‐temperature glass transition characterizing interfacial dynamics; additionally, enhancing creep resistance and thermal stability at the earlier stage of degradation were observed.