## 3 Results and Discussion
### Properties of MH/PCS/DVB  
Tests of the microstructure, surface polarity, X-ray diffraction behavior, and thermodegradation of MH/PCS/DVB were conducted to reveal the properties of MH/PCS/DVB. The microstructure of MH/PCS/DVB and the distribution of Mg and Si are shown in Figure 3. MH/PCS/DVB maintains the hexagonal platelet-shaped and homogeneous distribution of Mg and Si on the surface, which indicates good surface coating of MH by PCS. \begin{table}
\begin{tabular}{c c c c c} \hline \multirow{2}{*}{**Bond**} & \multirow{2}{*}{**Vibration Mode**} & \multicolumn{3}{c}{**Wave Number (cm\({}^{-1}\))**} \\ \cline{3-5}  & & **PCS** & **DVB** & **PCS/DVB** \\ \hline C-H in benzene & Stretching & – & 3087, 3058, 3006 & 3015 \\ C-H in -CH\({}_{2}\)- & Stretching & 2955, 2895 & 2966, 2930, 2873 & 2922 \\ Si-H & Stretching & 2100 & – & 2100 \\ C=C in -CH\({}_{2}\) & Stretching & – & 1630 & – \\ C=C in benzene & Skeleton vibration & – & 1595, 1577, 1510,1480 & 1595,1500, 1445 \\ C-H & Bending in plane & 1410,1359 & 1400 & 1410, 1359 \\ Si-CH\({}_{3}\) & Deformation & 1250 & – & 1250 \\ Si-O & Stretching & 1020 & – & 1020 \\ C-H in -CH\({}_{2}\) & Bending out of plane & – & 989 & 1000 \\ C-H in benzene & Bending out of plane & – & 906, 844, 800, 707 & 890, 709 \\ Si-C in Si-CH\({}_{2}\)-Si & Stretching & 830 & – & 830 \\ \hline \end{tabular}
\end{table} 
Table 2: The FTIR absorption peaks and vibration modes of PCS, DVB, and PCS/DVB. Figure 2: (**a**) The gel content of PCS/DVB after 4 h at 140 \({}^{\circ}\)C. (**b**) The FTIR spectra of DVB, PCS, and PCS/DVB. The X-ray diffraction pattern (a) and the FTIR absorption spectrum (b) of MH/PCS/DVB are shown in Figure 4. In comparison with MH, no new diffraction peak emerged in the diffraction pattern of MH/PCS/DVB (Figure 4a), but there was a noticeable change in the diffraction peak intensity of the (101) lattice plane. The lattice plane (001) of MH exhibited weak polarity, whereas the (101) lattice plane was composed of Mg\({}^{2+}\) with solid polarity. Thus, the polarity could be analyzed using the ratio of the diffraction peak intensities of the (001) and (101) lattice planes [10]. The I\({}_{001}\)/I\({}_{101}\) ratios of MH and MH/PCS/DVB were 0.65 and 0.94, suggesting that the surface polarity of MH/PCS/DVB decreased. Compared with MH and PCS, the Si-C bond of MH/CPS/DVB shifted from 795 cm\({}^{-1}\) to 833 cm\({}^{-1}\), while the Si-O bond shifted from 1011 cm\({}^{-1}\) to 1108 cm\({}^{-1}\). This indicates a strong interaction between PCS and MH, which is probably due to the interaction of Si-O with Mg\({}^{2+}\) in the (101) lattice plane as well as the interaction of Si-H with the hydroxyl group in MH, which results in a weakened diffraction pattern of the (101) lattice plane and restricts the movement of the Si-C and Si-O bonds. Digital images of the water contact angles of MH and MH/PCS/DVB are shown in Figure 5. The water contact angle of MH is 17.5\({}^{\circ}\), while the water contact angle of MH/PCS/DVB is 130.5\({}^{\circ}\). This implies a transformation of MH powder from hydrophilic to hydrophobic and that the PCS/DVB effectively covered the MH. Figure 4: (a) XRD patterns and (b) FTIR spectra of MH and MH/PCS/DVB. Figure 3: The morphology of MH/PCS/DVB (a) and element distributions of Mg (b) and Si (c). XPS was conducted to reveal the element bonding state of MH/PCS/DVB. The full XPS spectra of MH and MH/PCS/DVB and the atomic contents of elements are shown in Figure 6 and Table 3, respectively. The binding peak of the Si element is found in the full XPS spectrum of MH/PCS/DVB (Figure 6a), and the binding state of Si2p is revealed in Figure 6c. The binding energies of Si2p at 102.9 eV and 101.1 eV belong to Si-O and S-C, which are dominant in PCS. In addition, the element content on the surface of MH/PCS/DVB was different from MH. The Si content of MH/PCS/DVB increased to 11.27%; the Mg content decreased from 22.78% to 7.76%; and the C content increased from 18.2% to 39.99%.