Surface Modification of gamma-Al_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 gamma-Al_2O_3 nanoparticles and micronparticles,respectively.The results showed that the percent graft of nano-Al_2O_3 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 gamma-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 gamma-Al_2O_3 nanoparticles was easier than that of micronparticles.