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The influence of nanosilica functionalization on the properties of hybrid nanocomposites

The aim of this research is to evaluate the effect of silica nanoparticles (SNs) modification on the physicochemical properties of some hybrid nanocomposites. SNs with high specific surface area were silanized by two complementary mechanisms using organosilanes with different functionalities, 3-methacryloxypropyltrimethoxysilane (MPS), octyltrimethoxysilane (OTMS) or a mixture of them in order to generate a different interphase between the filler and the polymeric matrix. The SN silanization efficiency was investigated using Fourier transform infrared spectra, x-ray photoelectron spectroscopy, transmission electron microscopy and thermogravimetric analysis (TGA). Several types of hybrid nanocomposites based on dimethacrylate monomer and SN were synthesized by bulk polymerization process. The influence of the silanized SN on the methacrylic groups reactivity was studied using differential scanning calorimetry, and the thermostability of the hybrid nanocomposites was revealed by TGA. Additionally, the dynamic thermomechanical properties of the hybrid nanocomposites were determined by Dynamic Mechanical Analysis (DMA).