Surface treatment of magnesium oxysulfate whiskers through plasma polymerization

The surface of magnesium oxysulfate (MOS) whiskers was treated through plasma polymerization to increase the compatibility between the MOS whiskers and a polymer matrix. Different plasma parameters were chosen to determine the most hydrophobic coating. The surface structure of the plasma‐treated MOS...

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Bibliographic Details
Published in:Surface and interface analysis 2019-12, Vol.51 (13), p.1316-1324
Main Authors: Lan, Shengjie, Zhu, Donghai, Dang, Li, Huang, Ziyang, Yang, Linbo, Xu, Ziyu
Format: Article
Language:English
Subjects:
coating
magnesium oxysulfate whiskers
plasma polymerization
surface treatment
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Summary:The surface of magnesium oxysulfate (MOS) whiskers was treated through plasma polymerization to increase the compatibility between the MOS whiskers and a polymer matrix. Different plasma parameters were chosen to determine the most hydrophobic coating. The surface structure of the plasma‐treated MOS whiskers was examined. The MOS whiskers retained their crystal structure after plasma treatment, as shown by X‐ray powder diffraction (XRD) analyses. X‐ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FT‐IR) spectroscopy analyses revealed that a polymer sheath was formed on the surface of the MOS whiskers, and interfacial chemical bonds were generated between the polymer sheath and the MOS whiskers. The thin‐layer polymer sheath was uniform around the entire surface of the MOS whiskers and exhibited a typical amorphous structure, as determined by transmission electron microscopy (TEM) combined with selected area electron diffraction (SAED) analyses. The possible reaction mechanism on the surface of the MOS whiskers under plasma treatment was then proposed. Finally, the effect of surface treatment was evaluated by scanning electron microscopy (SEM), measurement of the contact angle and contact angle hysteresis, and torque rheometer. Results showed that plasma treatment could markedly increase the hydrophobicity of the MOS whiskers' surface, effectively reducing the agglomeration and improving the dispersibility of the MOS whiskers in the matrix, which results in the improved compatibility between the MOS whiskers and the polyvinyl matrix, as well as the processability of the composites.
ISSN:0142-2421
1096-9918
DOI:10.1002/sia.6699