Poly (dimethyl siloxane) (PDMS) was grafted on SiO
2-coated TiO
2 particles through the condensation between OH gropus on the particles and an end of PDMS. The effect of the grafting on the dispersion stability of the particles in PDMS was studied. Grafted PDMS, of which molecular weight was 1550, decreased the rate of aggregation of the particle by a factor of about 0.09, while non-grafted particles underwent rapid aggregation in PDMS. Quantitative analysis of the grafted PDMS by the diffuse reflectance FT-IR revealed that the number of moles rather than total weight of PDMS grafted on a unit weight of the particles was more important for the stabilization of the dispersion for the PDMS with the molecular weight between 1550 and 4350. Also, it was suggested that hydrogen bonds between unreacted OH groups on a particle and the oxygen atom of PDMS grafted on another particle, besides van der Waals attraction, were greatly responsible for the aggregation of the grafted particles.
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