Résumé
Nanostructured hybrid anion exchange membranes (AEMs) with enhanced mechanical properties were fabricated by first applying a solvent vapor annealing (SVA) treatment to a block copolymer (BCP) film, enabling the formation of a double gyroid (DG) morphology, followed by the chemical vapor infiltration (CVI) of an inorganic precursor to create robust ion-conducting DG nanochannels. To optimize the ion conductivity (IC) while preserving the mechanical strength, solvent-annealed (24 h, dichloromethane) BCP films were infiltrated with a 3-iodopropyltrimethoxysilane (IPTMS) vapor for various durations. The bifunctionality of IPTMS introduces a trade-off between the IC and mechanical properties, as the CVI process simultaneously enhances ion conduction by releasing free iodide through its reaction with the BCP chains and reinforces mechanical stability via the formation of non-conductive silica-rich domains within the DG nanochannels. The resulting hybrid AEMs, with a storage modulus (EIS' ≈400 MPa at 25°C) that is 10 times higher than that of their neat counterparts (E′ ≈15 MPa at 25°C), exhibit an IC as high as 3.2 × 10 -5 S.cm -1 at 30°C.