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We are indebted to Dr. James Pickett of GE for this insight. He reports seeing microscopic evidence for this phenomenon on the lee (“shadow”) side of TiO2 particles in a polycarbonate matrix. Mie theory could be used to calculate the magnitude of this effect (cf. Ref. 9, also Born, M. and Wolf, E. Principles of Optics,7th Ed., Cambridge University Press, New York, 1999). Since photodegradation rates are typically proportional to light intensity, and total integrated intensity is normally a conserved quantity in physics (because of the principle of conservation of energy), it is not clear that this mechanism should lead to a net increase in photochemically induced mass loss, but it would certainly localize the region where the photodegradation is occurring.
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Wood, K.A., de Robien, S. (2009). A Quantitative Model for Weathering-induced Mass Loss in Thermoplastic Paints. In: Martin, J.W., Ryntz, R.A., Chin, J., Dickie, R.A. (eds) Service Life Prediction of Polymeric Materials. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-84876-1_30
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