Preparation and Properties of Oligomeric Siloxane-Grafted Silica Nanoparticles in a Dry Surface Treatment System

For the purpose of the prevention of environmental pollution and the simplification of reaction process, the dry surface treatment system and carefully controlled synthesis of oligomeric siloxane (oligo-SiO) was investigated. The grafting of the oligo-SiOs onto the silica surface was successfully achieved. The oligo-SiOs made by both bifunctional silane and tetrafunctional silane contained many hydroxyl groups that led to the higher chemical grafting efficiency. By grafting of oligo-SiO containing moderate number of phenyl groups onto the surface, the silica was easily dispersed in mixed solvent of toluene/ethyl acetate. In addition, the oligo-SiO-grafted silica dispersed in a composite polyimide film had excellent adhesion ability to a silicon chip.