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The organic–inorganic hybrids of poly(amide-6-b-ethylene oxide) (PEBAX^®) and silica were prepared via in situ polymerization of tetraethoxysilane (TEOS) using the sol–gel process and their gas transport properties were studied. The nanodispersed inorganic network produced in the organic matrix was characterized by solid-state ²⁹Si NMR, Fourier transform infrared (FT-IR), dynamic light scattering (DLS) and field emission scanning electron microphotography (FE-SEM). Wide angle X-ray diffraction (WAXD) patterns and differential scanning calorimetry (DSC) thermograms of PEBAX^® and hybrid materials revealed that the incorporation of silica induced the structural modification of polymer chains. Gas permeation measurements were accomplished at various temperatures with He, CO₂, O₂ and N₂. These hybrid membranes exhibited higher gas permeability coefficients and permselectivities than PEBAX^® …