Surface modification mechanism of magnesium oxysulfate whiskers via wet chemical method

摘要

Magnesium oxysulfate whisker(MOSW) was produced using magnesite and sulfuric acid as raw materials by hydrothermal method and further modi?ed by taking zinc stearate as modi?er via wet chemical method.The in?uences of the amount of modi?er, slurry concentration, modi?cation duration, modi?cation temperature and the stirring rate on the surface modi?cation were investigated. The effects of surface modi?cation in functional groups, morphology and electron binding energies of surface elements of MOSW were characterized by Fourier transform infrared spectroscopy(FT-IR), scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS). The mechanism of modi?cation was analyzed by studying the microstructure model of the surface of MOSW, which was modi?ed by zinc stearate. The results show that the coordination is generated by the Mg element and O in carboxylic ion of modi?er, and the chemical bond could be obtained by modi?cation. Moreover, the surface of MOSW bonds the molecules of zinc stearate, and it becomes rough. Then, the hydrophobicity of MOSW is also improved signi?cantly. In addition, the 1s electron binding energies of Mg and O on the surface of MOSW decrease by1.2 and 0.2 eV, respectively.