Integration of titanium dioxide into EVA/organoclay nanocomposites: Structural behavior and response to ultraviolet light

This study shows how montmorillonite clay (C30B) and titanium dioxide (TiO 2 ) can be incorporated into EVA polymer through melt blending, utilizing clay:TiO 2 ratios of 1:0, 2:1, 1:1, 1:2, and 0:1. WAXD, SEM, TGA, and stress-strain tests were used to evaluate the structure, morphology, thermal stability, and mechanical properties of the materials. Additionally, a three-hour ultraviolet irradiation study was conducted using an accelerated aging chamber equipped with eight UV lamps. Post-irradiation products were analyzed using FTIR and DRX. The results indicated a widespread distribution of clay layers within the polymer; however, the dispersion of TiO 2 particles was minimal. Despite this, thermal stability remained unchanged, while mechanical properties showed improvement. Irradiation experiments revealed photodegradation of the polymer after just 3 hours of exposure to UV light. We propose that the polar and non-crystalline nature of vinyl acetate (VA) allows interactions with the reactive oxygen species generated by TiO 2 , facilitating the photodegradation of EVA polymer. The results suggest that versatile polymer materials can be created by blending clay and TiO 2 with EVA. TiO 2 can leverage its photocatalytic properties to decompose volatile compounds, pollutants, or microorganisms under controlled UV irradiation. Ultimately, the materials can undergo self-photodegradation after their use and disposal, offering environmental benefits.