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Wednesday, 18 September 2019
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Raw materials & technologies, Technologies, Nanotechnology

Investigating mechanical properties of a photocatalytic pseudo-paint

Thursday, 8 October 2015

Photocatalytic oxidative paints (e.g., a paint containing nano-TiO2) are used to break down volatile organic compounds to CO2 by photooxidation reactions.

The tensile strengths of the samples were measured as the mechanical properties. Source: S. Hofschlaeger/pixelio.de

The tensile strengths of the samples were measured as the mechanical properties. Source: S. Hofschlaeger/pixelio.de

In a research, a photocatalytic oxidative pseudo-paint was made with acrylic-styrene copolymer latex, TiO2 pigment, calcium carbonate extender, and TiO2 nanoparticles as a photocatalyst.

To investigate the effects of the pigment, extender, and nanoparticles on the mechanical properties of the samples and their relationship to their photocatalytic activity, different contents of the particles were dispersed in the paint formulation. The tensile strengths (TSs) of the samples were measured as the mechanical properties. The samples were characterised by scanning electron microscopy analysis.

Measuring the tensil strength

The researchers found that up to 3% nano-TiO2 enhanced the mechanical properties of the pigmented resin, whereas beyond this, TS decreased. In samples containing 3% nanoparticles, the incorporation of 15% TiO2 pigment caused optimised mechanical properties, and beyond that, TS decreased because of particle agglomeration. In the absence of nanoparticles, the samples showed improvements in the mechanical properties with up to a 40% loading of pigment. The results reveal that the samples containing nano-TiO2 and pigment showed the same trend for the mechanical and photocatalytic properties before the critical pigment volume concentration (CPVC). However, when the extender was incorporated or TiO2 particles were loaded beyond CPVC, the mechanical and photocatalytic properties correlation was compromised, and they were not directly correlated.

The study is published in: Journal of Applied Polymer Science.

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