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Preparation and Characterization of Organic / Inorganic Polymer Nanocomposites

Inorganic cores, consisting of silica and titania, have been prepared via basic Stoeber synthesis. Those cores have been functionalized, using trimethoxysilyl propylmethacrylate (MPTMS) and introduced into a miniemulsion copolymerization system. Separation of the physically and chemically adsorbed fractions of modified particles was achieved with Soxhlet extraction. By using thermo gravimetric analysis (TGA), the various fractions can be determined. The investigation shows that the MALDI-TOF analysis can only be used to detect the physically adsorbed fractions of modified surfaces. The miniemulsion consisted of styrene (S) and 2-hydroxyethyl methacrylate (HEMA), styrene sulfonic acid (SSA) or aminoethyl methacrylate hydrochloride (AEMA) as comonomer in varying compositions. The morphology of the products has been investigated by SEM and dynamic light scattering (DLS) measurements. The composition of the products has been investigated by photoacoustic FTIR (PA-FTIR) spectroscopy and elemental analysis. Thermal properties have been determined by TGA and DSC analysis.