HEAT-TREATMENT OF TRIMETHYLSILYLATED LAYEREDPOLYSILICATES AND THE VARIATION IN THEIRSPECIFIC SURFACE AREAS

Trimethylsilylated (TMS) magadiite and kenyaite were treated thermally and the influence of trimethylsilyl groups on the surface areas of the heat-treated products was investigated. The basal spacings of the TMS-magadiites treated up to 300°C were constant. When TMS-kenyaite was heat-treated, the basal spacing was kept at a constant value until 400°C. The specific surface areas of the products increased up to those temperatures. After the organic groups were burned, the interlayer spaces of the heat-treated TMS-magadiite and TMS-kenyaite were still expanded possibly by the presence of oxidized silyl groups in the interlayer spaces