Papers by Keyword: Hexamethyldisiloxane

Abstract: An effective method was proposed to recycle trimethyl chlorosilane (Me3SiCl) from chlorosilane waste generated by chlorosilane plants to produce hexamethyldisiloxane (Me3SiOSiMe3) and trimethylethoxysilane (Me3SiOEt) through hydrolysis and alcoholysis with ethanol, respectively. And this method had been used successfully in a chemical plant of Hebei Hongxing in North China. The concentration of Me3SiCl in the waste stream varied between 40 wt%~80 wt% mixed with SiCl4, Me2SiCl2, and a smaller amount of 2-MeC5H11 and 3-MeC5H11. Laboratory experiments were performed using simulated wastes in order to obtain optimal operational parameters and validate the feasibility of the method.

Abstract: This study concerns the elaboration of a superhydrophobic coating on an aluminium alloy substrate by means of surface anodization and plasma polymerization. First, anodizing was used to create a micro/nanostructured aluminium oxide layer on the aluminium alloy substrate. Then, the resulting rough surface was coated with a plasma-polymerized hexamethyldisiloxane (HMDSO) film. The effects of several processing parameters such as input RF power (30 to 60 W) and deposition time (5 to 35 min), on the hydrophobic properties of the resulting films were investigated. Fourier Transform Infrared Spectrometry (FT-IR) analysis showed the important effect of the plasma power charge on the intensity of Si-CH₃ band which effectively influences the hydrophobic character of the coating. The static contact angle of the superhydrophobic film was also evaluated at low temperature, which showed that hydrophobicity of the coating was reduced at low temperature. Keyword: Plasma polymerization, Hexamethyldisiloxane, Superhydrophobicity, Icephobicity, Anodizing

Abstract: A transparent hard coating of silicon oxide (SiOx) deposited by using plasma enhanced chemical vapour deposition (PECVD) can protect the surfaces of plastics and metals. This coating has good adhesion, good wear-resistance and environmental resistance. Our work is to optimize this protective organosilicon film in an industry manufacturing process for the metal cover of mobile phones and plastic lenses. Investigation of the failures of the film and analysis of the defect in deposited films by means of the optical microscope and atomic force microscope (AFM) shows that mechanism of the micro defect with Newton color rings.