The surface of nano SiO 2 was modified by being encapsulated with hydroxy propyl methyl cellulose (HPMC), and then co grafted with acrylates. The grafting conditions, such as pH of the medium, and initiator conce...The surface of nano SiO 2 was modified by being encapsulated with hydroxy propyl methyl cellulose (HPMC), and then co grafted with acrylates. The grafting conditions, such as pH of the medium, and initiator concentration have been studied. The modified nano SiO 2 particles were characterized by TEM, DSC and FT IR spectra. TEM images show that the surface of the nano particles has been successfully modified by a thick layer of film like polymer in this way. The DSC results show that the decomposition temperature of modified nano particles of SiO 2 is 90 ℃ higher than that of grafted on polymer. According to the FT IR spectra, it is convinced that poly methyl methacrylate (PMMA) and poly acrylic butyl ester (PBA) were co grafted onto the surface of nano SiO 2.展开更多
基金ProjectsupportedbytheNaturalScienceFoundationofAnhuiEducationalCommittee (No .2 0 0 1KJ0 96),theSpecialScienceResearchFoundationofAnhuiNormalUniversity (No .2000ZX10)andtheNaturalScienceImportantFoundationofAnhuiProvince (No .0 10 2 2 0 0 7)
文摘The surface of nano SiO 2 was modified by being encapsulated with hydroxy propyl methyl cellulose (HPMC), and then co grafted with acrylates. The grafting conditions, such as pH of the medium, and initiator concentration have been studied. The modified nano SiO 2 particles were characterized by TEM, DSC and FT IR spectra. TEM images show that the surface of the nano particles has been successfully modified by a thick layer of film like polymer in this way. The DSC results show that the decomposition temperature of modified nano particles of SiO 2 is 90 ℃ higher than that of grafted on polymer. According to the FT IR spectra, it is convinced that poly methyl methacrylate (PMMA) and poly acrylic butyl ester (PBA) were co grafted onto the surface of nano SiO 2.
