Surface Modification of γ - A_2O_3 nanoparticles by Electron Co-irradiation-induced Graft polymerization of MMA

摘要

Electron beam co-irradiation graft polymerization has been carried out up to an absorbed dose of 30 kGy in air at room temperature between methyl methacrylate (MMA) monomer and γ-Al_2O_3 nanoparticles and micronparticles, respectively. The results showed that die percent graft of nano-AhOa and micron-Al_2O_3 is 6.4% and 0.9%, respectively. In the FT-IR spectra of irradiated nanoparticles, there was a new absorption peak at 1725 cm~(-1) that was attributed to carbonyl stretching vibration and Al-O-C bonds forming on the surface of nanoparitcle. But in the spectra of micron-Al_2O_3, the absorption peak at 1725 cm~(-1) was very weak. X-ray photoelectron spectroscopy (XPS) measurements confirmed the existence of carbonyl. The UV absorption intensities of two γ -Al_2O_3 powders strengthened after irradiation graft polymerization. These results showed that MMA has been successfully grafted onto nano-Al_2O_3 surface at the dose of 30 kGy. However, there were few new chemical bonds on micron-Al_2O_3 surface. It could be deduced that irradiation graft polymerization of γ-Al_2O_3 nanoparticles was easier than that of micronparticles.