8.1 Degradation in a Stress, Mechanism and Response Framework: Acrylic Coatings
(Room 234-236)
10 Apr 18
9:00 AM
-
9:30 AM
Tracks:
Session 8: Measuring & Testing, Session 8: Measuring & Testing I
A better understanding of the effect of photoreactivity of titanium dioxide (TiO2) pigments on the degradation modes and rates of acrylic waterborne coatings can optimize and extend the durability and lifetime of the coatings. The predictive models, netSEM (network structural equation modeling) models, were constructed from gloss and colorimetry responses. Two acrylic waterborne coatings with different amount of anatase TiO2 were exposed in outdoor exposure and accelerated exposures at periodic intervals. Fourier transform infrared spectroscopy (FTIR-ATR), colorimetry and glossmetry were used to evaluate the chemical degradation and physical property change of coatings. The results were statistically analyzed to identify statistically significant relationship by a generation of structural equation modeling techniques. Based on netSEM models, FTIR as degradation mechanism variable and gloss or colorimetry as response, showed that different degradation modes dominate the response change of samples in constant accelerated and cyclic accelerated exposure. The quantitative netSEM framework, combining chemical and physical property changes with exposure time/dose, can be utilized for the cross-correlation of accelerated and real world exposures.