2009 Volume 45 Issue 3 Pages 88-93
The surface treatment of spherical silica particles with silane coupling agent having mercapto groupwas carried out. Structure of formed silane-treated layer on silica particulate surface was analyzedusing a pulse NMR. Effects of loading amount and alkoxy group number of silane on the structurewere investigated.For this purpose, silanes with dialkoxy and trialkoxy structures were used.The loading amount of silane on the silica surface was varied from one to eight times of the amount required for monolayer coverage.The relaxation time was longer in the dialkoxy type than in the trialkoxy type of silane.It increased with an increase in the loading amount of silane for the dialkoxytype.However, there was no effect of the loading amount of silane for the trialkoxy type.It was found that the silane structure was flexible for the dialkoxy type, where as it was rigid for the trialkoxy type
