Density compatibility of encapsulation of white inorganic TiO2 particles using dispersion polymerization technique for electrophoretic display

The polymer encapsulated TiO2 particles with negative charge surface functionality were prepared by a two-stage dispersion polymerization technique for applications in electrophoretic displays (EPDs). In order to give the functionality for inorganic pigment particles in the EPDs, we have investigated the density of the polymer encapsulation of TiO2 Particles with the density of 4.0 g/ml. The density of the polymer encapsulated TiO2 particles is suitable to 1.7 g/ml, due to density matching with suspending media. In results, the obtained particle; showed the average densities in the range 1.5-2.5 g/ml at 25 degreesC. The polymer encapsulation of TiO2 particles was confirmed with scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The TGA results showed that the initial weight loss of the encapsulated particles occurred near 400degreesC in nitrogen, due to the degradation of the encapsulating polymer of TiO2 particles. (C) 2004 Published by Elsevier B.V.