Effects on the UV absorbing power of titanium dioxide

Scientists havs studied the role of titanium dioxide surface modification on UV protective properties of eco-friendly PA coating.

One graphic shows the silhouette of a city against a large
Modification of titanium dioxide surface can have both a positive and a negative effect on the UV absorbing power of titanium dioxide.  Image source: mohamed_hassan - Pixabay (symbol image).

The aim of a new work work was to prepare polyacrylate emulsions (PA) with the addition of modified titanium dioxide (TiO2) nanoparticles. The modifiers used in the work are the nonionic emulsifier TX-100, the cationic initiator AIBA, the silane AMPTS, and the trisilanol POSS. The results show that particles with a larger hydrodynamic diameter are formed by the addition of modified fillers and that the viscosity of the PA emulsion increases significantly due to the modification of the TiO2 surface.

Both a positive and a negative effect

The morphology indicates poorer dispersibility and distribution of the modified fillers in the polymer compared to coating with unmodified fillers. The thermal stability of PA is significantly increased by the addition of modified TiO2 nanoparticles. The results have also shown that the modification of TiO2 with AMPTS increases the UV absorbing ability of TiO2, while the modification with other modifiers enhances the photocatalytic effect of TiO2.

The study has been published in Progress in Organic Coatings, Volume 174, January 2023.

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