Abstract
There are chemisorbed and physisorbed silane coupling agent（ SCA） molecules in the treated layer on inor ganic surface. The former is chemicaly bonded and the later is adsorbed by van der Waals force to the surface. Increasing of chemisorption by the increase of molecular weight of SCA was investigated. For the SCA with amino group, the chemisorbed molecules were larger for amino-ethyl aminooctyltrimethoxysilane as high molecular weight type than for 3-aminopropyltrietoxysilanene as normal type. For the SCA with hydrocarbon chain, the chemisorption was lower for both low molecular weight type and decyltrimethoxysilane（ DTMS） as high molecular weight type. For the SCA with fluorocarbon chain, the chemisorption was lower for the low mo lecular weight type, whereas it increased significantly by heating for 1H,1H,2H,2H-perfluorodecyltriethoxysi lane（ F17DTES） as high molecular weight type. The wide angle X-ray diffraction analysis for F17DTES treated silica particles showed that the fluorocarbon chain forms lamellar structure. On the other hand, there was no indication of ordered structure for DTMS-treated system. This seems to influence on the difference of chemisorption for both treated systems.
