Sequential preparation of styrene/vinyltriethoxysilane-derived precursors for hybrid and porous materials

Converting sequence-prepared copolymer precursors into hybrid and porous materials remains challenging because alkoxysilane condensation can reduce structural definition during isolation and processing. Here, styrene/vinyltriethoxysilane (VTES)-derived precursors were prepared by sequential anionic polymerization and transformed into polysiloxane-containing hybrids by acid-catalyzed sol–gel treatment. FTIR and SEC/GPC of the soluble fraction are consistent with incorporation of VTES-derived units, although the isolated products are better regarded as operational sequential precursors than as rigorously defined diblock copolymers. After acid treatment, SAXS, SEM, TGA, DSC, and ²⁹Si MAS NMR indicate weakly ordered nanostructured hybrids with short-range compositional correlations, multiscale heterogeneity, and extensively condensed T²/T³ silsesquioxane environments. Exploratory post-treatments showed moderate porosity after calcination of the 1:1 hybrid (51.7 m² g⁻¹) and substantially higher surface area after carbonization of the 7:3 hybrid followed by HF etching (561.9 m² g⁻¹). These results establish the feasibility of the precursor-to-material route while showing that processing-induced condensation limits rigorous structure-property assignment.