Interlamellar Grafting of Polyols in Kaolinite

抄録

This paper reports on the modifications of the interlamellar surfaces of kaolinite by the direct grafting of two difierent alditols, namely, D-mannitol and dulcitol, from the melt. Several starting materials were used among which the kaolinite-DMSO intercalate was the most efiective. The results of the XRD, FTIR and TGA analyses confirmed the grafting of the polyol molecules on the aluminol surface of kaolinite. ¹³C CP and DD/MAS spectra indicated the complete displacement of the guest molecules of the starting materials by the polyols and the rigidity of the latter in the interlamellar space. ²⁹Si and ²⁷M NMR spectra of the starting materials and the products are also discussed. It is plausible that oligomeric forms of the alditols are grafted on the aluminol surfaces of kaolinite at more than one point, in a bridging manner.