Dispersion Stability of TiO<SUB>2</SUB> Particles Coated with Polyorganosiloxane by Photoinduced Graft Polymerization

概要

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Photoirradiation on the suspension of TiO<SUB>2</SUB> particles in 1,3,5,7-tetramethylcyclotetrasiloxane led to the graft polymerization from the particles, forming a linear poly (methylsiloxane) (PMS) layer. Transmission electron micrograph of the particles obtained after 2 h of photoirradiation clearly showed the polymer layer with a thickness ranging from 10 to 20 nm. The amount of the grafted polymer determined by diffuse reflectance IR measurements increased with an increase in the photoirradiation time, reaching a plateau value of ca. 27 wt% above 15 h. The dispersion stability of the particles in poly (dimethylsiloxane) was remarkably improved by the coating of PMS. In order to estimate the van der Waals potential energy in this system, a single layer model was applied. The results of the calculation revealed that the decrease of van der Waals potential energy accompanied by the graft polymerization was partly responsible for the better dispersion stability.
Japan Society of Colour Materialの論文