The invention relates to light-sensitive nanometer
silicon dioxide and a method for preparing the same.The surfaces of the light-sensitive nanometer
silicon dioxide contain covalently bonded groups shown as a formula, R1 and R2 in the formula represent independent hydroxyl or ethoxyl or
nanometer particle surfaces -O-Si-.The light-sensitive nanometer
silicon dioxide and the method have the advantages that the light-sensitive nanometer
silicon dioxide contains a
benzophenone group which is a photo-initiator,
insertion reaction can be carried out on the
benzophenone group and C-H bonds under
ultraviolet irradiation conditions, accordingly, modified nanometer
silicon dioxide and
polymer substrates can be combined with one another by chemical bonds, agglomeration among nanometer particles can be prevented, the dispersibility of the nanometer particles in high-
polymer matrixes can be improved, and the
dispersion stability of the nanometer particles in the high-
polymer matrixes can be enhanced; the light-sensitive nanometer
silicon dioxide can be used as a filler to be added into high-polymer materials, is excellent in high-polymer matrix compatibility and can be connected with the high-polymer matrixes by covalent bonds after being irradiated by
ultraviolet light, and the
dispersion stability of the light-sensitive nanometer silicon dioxide in the high-polymer matrixes can be improved.