Mechanical properties of hybrid organic–inorganic materials

Homogeneously dispersed organic–inorganic hybrid nanocomposites can be obtained by increasing the interfacial interactions between both components via the formation of hydrogen bonds or covalent bonds, by mixing various polymers or via the adequate choice of the inorganic precursors. The mechanical response of these advanced functional materials is an issue of paramount importance when industrial applications are targeted. Large progress in the understanding of the mechanical properties of O–I hybrids has been gained by testing these materials under different conditions (static and dynamic, low and large deformations up to fracture) and using specific techniques developed for the mechanical characterization of conventional materials such as polymers, glasses or ceramics. However, the mechanical properties of hybrid O–I materials are dependent on their micro- and nanostructures and on the nature and extent of the O–I interfaces. Consequently, predictable mechanical properties for hybrids still represent a major challenge for hybrid materials science. Industrial attraction for hybrid materials has been emphasized by the development of new functional coatings. An important issue is the interface between the film and the substrate since strong adhesion can be tailored and ensures that delamination of the film will be limited.