Supramolecular thermoplastics and thermoplastic elastomer materials with self-healing ability based on oligomeric charged triblock copolymers

Supramolecular polymeric materials constitute a unique class of materials held together by non-covalent interactions. These dynamic supramolecular interactions can provide unique properties such as a strong decrease in viscosity upon relatively mild heating, as well as self-healing ability. In this study we demonstrate the unique mechanical properties of phase-separated electrostatic supramolecular materials based on mixing of low molar mass, oligomeric, ABA-triblock copolyacrylates with oppositely charged outer blocks. In case of well-chosen mixtures and block lengths, the charged blocks are phase separated from the uncharged matrix in a hexagonally packed nanomorphology as observed by transmission electron microscopy. Thermal and mechanical analysis of the material shows that the charged sections have a T-g closely beyond room temperature, whereas the material shows an elastic response at temperatures far above this T-g ascribed to the electrostatic supramolecular interactions. A broad set of materials having systematic variations in triblock copolymer structures was used to provide insights in the mechanical properties and and self-healing ability in correlation with the nanomorphology of the materials

Transformation de l'heptane normal en présence de catalyseurs à base de mordénite larges pores échangée à l'argent et imprégnée de platine

Les résultats obtenus dans l'étude des transformations de l'heptane normal, sous pression d'hydrogène sur mordénite échangée à l'argent et imprégnée de 0,5 % en poids de platine, sont interprétés dans le cadre d'un mécanisme bifonctionnel. Toutefois, pour rendre compte de l'influence de la pression partielle d'hydrogène sur les vitesses d'isomérisation et de craquage, il est nécessaire de faire intervenir, pour le craquage par bêta scission des carbocations, un mécanisme bisite impliquant la participation d'un proton voisin du carbocation, tous deux liés au support acide

Modelling and simulations of the chemo-mechanical behaviour of leached cement-based materials: Leaching process and induced loss of stiffness

International audienc

Modelling and simulations of the chemo-mechanical behaviour of leached cement-based materials: Interactions between damage and leaching

International audienc

Design and dimensionning of in situ diffusion experiments at Bure

Communication par affich

Application of inverse modeling methods to thermal and diffusion experiments at Mont Terri Rock laboratory

International audienc