Hemijska industrija 2013 Volume 67, Issue 6, Pages: 923-932
https://doi.org/10.2298/HEMIND131106081R
Full text ( 733 KB)
Cited by
The influence of the size and surface modification of TiO2 nanoparticles on the rheological properties of alkyd resin
Radoman Tijana (Innovation center, Faculty of Technology and Metallurgy, Belgrade)
Džunuzović Jasna V. (Institute of Chemistry, Technology and Metallurgy (ICTM)-Center of Chemistry, Belgrade)
Jeremić Katarina (Faculty of Technology and Metallurgy, Belgrade)
Marinković Aleksandar D. (Faculty of Technology and Metallurgy, Belgrade)
Spasojević Pavle (Innovation center, Faculty of Technology and Metallurgy, Belgrade)
Popović Ivanka (Faculty of Technology and Metallurgy, Belgrade)
Džunuzović Enis S. (Faculty of Technology and Metallurgy, Belgrade)
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.
Keywords: TiO2 nanoparticles, surface modification, propyl gallate, lauryl gallate, alkyd resin, rheology
Projekat Ministarstva nauke Republike Srbije, br. 172062 i br.
45020