Nanocomposites Based on Poly(Amide-Imide) Matrix with Na–Mg Triple Chain Hydrosilicate

A new polymer-inorganic nanocomposite composed of fibrous Na–Mg triple chain hydrosilicate with a poly(amide-imide) matrix was developed. Its structure, morphology, and dynamic mechanical properties were studied. Stability and high values of mechanical characteristics were shown in a wide temperature range from –150 to 300°C for both the polymer and a composite based on it. The introduction of the fibrous hydrosilicate nanofiller led to a structuring of the polymer matrix and a change from an amorphous state to an ordered mesomorphic state. A comparative analysis of the free and cryo-fracture surface morphologies of the polymer films and composites was carried out. A model of the structure of the polymer matrix with a network of hydrogen bonds, the density of which depends on the reduced viscosity of the casting solution, was proposed.