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Spherical TiO2 particles of different size were dispersed in alkyd resin   based on soybean oil. Four samples of TiO2 particles were used, three   commercial and one obtained by acid catalyzed hydrolysis of titanium   tetraisopropoxide. The size of the synthesized nanoparticles was determined   by transmission electron microscopy. Surface modification of TiO2   nanoparticles was performed with propyl gallate and lauryl gallate. The   influence of the size of TiO2 nanoparticles, their concentration and type of   the surface modification on the rheological properties of alkyd resin was   investigated. The obtained results have shown that the viscosity of the   prepared dispersions was higher than viscosity of the pure resin, it   increases with decreasing particle diameter and decreases with frequency   increase. Surface modified particles showed higher influence on the viscosity   of alkyd resin than unmodified, because their hydrodynamic volume is higher   due to the presence of the adsorbed gallates, leading to the increase of   effective volume fraction of particles in dispersion. For the lowest TiO2   concentration, the viscosity was higher for sample modified with lauryl   gallate, due to the higher thickness of the adsorbed layer. The increase of   concentration, because of less dispersion stability of the particles modified   with propyl gallate, leads to particles agglomeration. The presence of   agglomerates, which was confirmed by a change in the slope of the functional   dependence of storage modulus on loss modulus, leads to a rapid increase in   viscosity. [Projekat Ministarstva nauke Republike Srbije, br. 172062 i br.   45020

The influence of the size and surface modification of TiO2 nanoparticles on the rheological properties of alkyd resin