Nanostructured organic–inorganic hybrid films prepared by the sol–gel method from self‐assemblies of PS‐b‐paptes‐b‐PS triblock copolymers |
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Authors: | CÉ Guinto Gamys Emmanuel Beyou Elodie Bourgeat‐Lami Pierre Alcouffe Laurent David |
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Institution: | 1. Université de Lyon, Lyon F‐69003, France;2. Université Lyon 1, Villeurbanne, F‐69622, France;3. CNRS UMR 5223, Ingénierie des Matériaux Polymères: Laboratoire des Matériaux Polymères et Biomatériaux, IMP@Lyon1, 15 Boulevard Latarjet, Villeurbanne F‐69622, France;4. CPE Lyon, CNRS, UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés (C2P2), LCPP Group, 43, Bd. du 11 Novembre 1918, Villeurbanne F‐69616, France |
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Abstract: | ABA‐based triblock copolymers of styrene as block ends and gelable 3‐acryloxypropyltriethoxysilane (APTES) as the middle block were successfully prepared through nitroxide‐mediated polymerization (NMP). The copolymers were bulk self‐assembled into films and the degree of phase separation between the two blocks was evaluated by differential scanning calorimetry (DSC). Their morphology was examined through small angle X‐ray scattering (SAXS) and transmission electron microscopy (TEM), whereas the mechanical properties of the corresponding cross‐linked self‐assembled nanostructures were characterized by dynamic mechanical analysis (DMA). Acidic treatment of the triblock copolymers favored the hydrolysis and condensation reactions of the APTES‐rich nanophase, and induced a mechanical reinforcement evidenced by the increase of storage modulus values and the shift of the glass transition temperature to higher temperatures due to confinement effects. In addition, the lamellar structure of the hybrid films was retained after the removal of the organic part by calcination. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 |
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Keywords: | block copolymers bulk self‐assembly crosslinking kinetics (polym ) living radical polymerization (LRP) mechanical properties morphology SAXS sol– gel triblock copolymers |
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