Élaboration et caractérisation des nanocomposites polymére/silice mésoporeuse nanométrique

Abstract

different series of poly (ethylene-co-vinyl acetate)/mesoporous silica type SBA-15 (EVA/SBA-15) nanocomposites, containing 0.5%, 1%, 1.5%, 2%, 2.5%, 3% and 4 % SBA-15 nanoparticles were prepared by melt blending an internalmixer. The mesoporous silica SBA-15 was synthesised by asol-gel method and organo-modified by hexadecyltrimethoxysilane (HDTMS). The terpolymer of ethylene-butyl acrylate-maleic anhydride (E-BA-MA) containing 6% butylacrylate, 3% maleic anhydridewas added as compatibilizer at 2wt% to nanocomposites including unmodified SBA-15. The properties ofEVA/SBA-15 nanocompositeswere characterised by infrared spectroscopy (FTIR), calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), rheology (Rubber Process Analyser), and by mechanical study. The results confirmed that SBA-15 nanoparticles was successfully organomodifiedby the HDTMS. The crystallinity of the matrix decreased and Young’s modulus increased with the incorporationof the SBA-15 and in the presence of E-BA-MAcompatibilizer, whereas elongation at break and tensile strength maintain almost the values of the matrix.An increase in storage modulus (G′), loss modulus (G″)and in the complex viscosity (η *) was obtained for EVA/2, 5% SBA-15, EVA/4% SBA-15/E-BA-MAand EVA/2% H-SBA-15 nanocomposites. Td,5 thermal stability was enhanced by 15°C and 21°C, respectively, for EVA/1% SBA-15, EVA/2% H-SBA-15 and EVA/2% SBA-15/E-BA-MAsystems as compared to the EVA matrix