Abstract
The effect of a surface treatment of glass beads with a silane coupling agent on a yield stress was investigated in the beads - filled poly (vinyl chloride) as typical ductile polymer matrix. γ - Aminopropyl methyldiethoxysilane was used as silane. The amount of silane necessary for creating monolayer coverage was calculated. The beads were treated with the silane in the range from 0.5 to 10 times of the amount necessary for monolayer coverage in water by some different conditions. The treated beads were washed with methanol to remove the unfixed silanes on the surfaces. The fixing ratio of the silane was determined by a carbon analysis of the treated beads both for as treated and methanol washed. A comparison between the yield stresses of the resins filled with both as treated and methanol washed beads was made. As a result, the yield stress increased with increasing the amount of silane treated in the range below that for monolayer coverage. However, a further improvement on the yield stress was not obtained in the range above the amount. The unfixed silanes on the bead surface depressed the improvement on the yield stress.
