A thermochemical approach to enhance hydrophobicity of SiC/SiO2 powder using gamma-methacryloxypropyl trimethoxy silane and octylphenol polyoxyethylene ether (7)

作者：Li, Chunxue; Feng, Dandan; Wang, Xiangke; Li, Zhihong; Zhu, Yumei^*

来源：Applied Surface Science, 2016, 360: 45-51.

DOI：10.1016/j.apsusc.2015.10.189

• SiC/SiO2 powder
• Surfaces
• XPS
• Water resistance
• Non oxidative thermal deposition materials

A thermochemical synthetic methodology for silicon carbide/silica (SiC/SiO2) powder modified by integrating [gamma-methacryloxypropyl trimethoxy silane (KH570) and octylphenol polyoxyethylene ether (7) (OP-7) with hydrophilic SiC/SiO2 particles is described. On account of weak hydrophobicity of SiC/SiO2 powder modified by KH570 (SiC/SiO2-KH570), the study focuses on the improvement of hydrophobicity utilizing alkylation reaction between OP-7 and KH570 at high temperature. Compared with using KH570 alone, SiC/SiO2 powder modified by KH570 and OP-7 (SiC/SiO2-KH570-OP-7) shows better water resistance, and also an increased contact angle from 73.8 to 136.4, resulting thus an improved hydrophobicity. Fourier transform infrared spectroscopy (FTIR), as well as X-ray photoelectron spectroscopy (XPS), was utilized to characterize these surfaces, and the results indicated that KH570 and OP-7 can be covalently bonded on the surface of SiC/SiO2 powder. Furthermore, it has been deeply investigated in the paper not only the possible modes of non-oxidative thermal degradation of OP-7 and KH570, but also the formation mechanism of more hydrophobic SiC/SiO2-KH570-0P-7 powder, which probably will have a potential utility for other inorganic materials.

• 出版日期2016-1-1
• 单位天津大学