Grafting Of Kaolin With Trifunctional Silanes

Silane-grafted-kaolin was synthesized by using octadecyltrichlorosilane, octyltrichlorosilane and phenyltrichlorosilane. These different silanes used have a prominent effect on the mechanism of the condensation reactions with the clay. The NMR spectroscopy indicated that there are various bonding possibilities of the trichlorosilanes molecules with the kaolin surface. The increase in the relative intensity of Q3 and the appearance of Q2, T3, T2 and T1 signals clearly indicates the grafting of silane molecules to kaolin surface silanol groups. The same successful graft of silanes was demonstrated by the appearance of characteristic absorption bands in the range of 2800-3000 cm-1 in the FTIR spectra, assigned to the C-H stretching and bending vibration.