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Surface Modification Of Cr2O3 Nanoparticles With 3-amino Propyl Trimethoxy Silane (APTMS). Part 1: Studying The Mechanical Properties Of Polyurethane/Cr2O3 Nanocomposites

M. J. Palimi, M. Rostami, M. Mahdavian, B. Ramezanzadeh
Published 2014 · Materials Science

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Abstract The surface of Cr 2 O 3 nanoparticles was modified with various amounts of 3-amino propyl trimethoxy silane (APTMS). Thermal gravimetric analysis (TGA), turbidimeter and Fourier transform infrared (FTIR) spectroscopy were utilized in order to investigate APTMS grafting on the nanoparticles. Then, polyurethane nanocomposites were prepared using various loadings of silane modified Cr 2 O 3 nanoparticles. The nanoparticles dispersion in the coating matrix was studied by a field emission scanning electron microscopy (FESEM). Dynamic mechanical thermal analysis (DMTA) and tensile test were utilized in order to investigate the mechanical properties of the nanocomposites. Results obtained from FTIR, TGA and turbidimeter measurements revealed that the organic functional groups of the silane were successfully grafted on the surface of the nanoparticles. The mechanical properties of the polyurethane were significantly enhanced using 2 wt% Cr 2 O 3 nanoparticles modified with 0.43 g silane/5 g pigment compared with other samples.
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