Nanostructured Organic-Inorganic Hybrid Films Prepared by the Sol-Gel Method from Self-Assemblies of PS-b-PAPTES-b-PS Triblock Copolymers

Ce Guinto Gamys (1) , Emmanuel Beyou (1) , Elodie Bourgeat-Lami (2) , Pierre Alcouffe (1) , Laurent David (1)

1 IMP-LMPB - Ingénierie des Matériaux Polymères - Laboratoire des Matériaux Polymères et des Biomatériaux
2 C2P2 - Laboratoire de Chimie, Catalyse, Polymères et Procédés, R 5265

ABA-based triblock copolymers of styrene as block ends and gelable 3-acryloxypropyltriethoxysilane (APTES) as the middle block were successfully prepared through nitroxide-medi- ated 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 tri- block copolymers favored the hydrolysis and condensation reactions of the APTES-rich nanophase, and induced a mechanical reinforcement evidenced by the increase of storage modulus val- ues and the shift of the glass transition temperature to higher tem- peratures due to confinement effects. In addition, the lamellar structure of the hybrid films was retained after the removal of the organic part by calcination.

Mots clés: block copolymers; bulk self-assembly; crosslinking; kinetics (polym.); living radical polymerization (LRP); mechani- cal properties; morphology; SAXS; sol-gel; triblock copolymers

Domaines: Polymères

Ce Guinto Gamys, Emmanuel Beyou, Elodie Bourgeat-Lami, Pierre Alcouffe, Laurent David. Nanostructured Organic-Inorganic Hybrid Films Prepared by the Sol-Gel Method from Self-Assemblies of PS-b-PAPTES-b-PS Triblock Copolymers. Journal of Polymer Science Part A: Polymer Chemistry, 2011, 49, pp.4193-4203. ⟨10.1002/pola.24861⟩. ⟨hal-00694319⟩