Light-induced aging

S. Zumbuhl, R. Knochenmuss, S. Wiilfert, F. Dubois, M.J. Dale, and R. Zenobi, A Graphite Assisted Laser Desorption/Ionisation Study of Light induced Aging in Triterpene Dammar and Mastic Varnishes, Anal. Chem., 70, 707 715 (1998). 

Light-Induced Ageing. The sheets were subjected to accelerated light-induced ageing in an apparatus providing UV and visible radiation (3). 

Zumbiihl, S., Knochemnuss, R., Wiilfert, S., Dubois, R, Dale, M.J., Zenobi, R. (1998) A graphite-assisted laser desorption/ionization study of light-induced aging in trit-erpene dammer and mastic varnishes. Anal. Chem., 70, 707. 

Figure 4.2 Influence of processing conditions (compounding time) in the compounder resistance to thermal-oxidative and UV-light-induced aging [581]... 

Rozanowska, M, Jarvis-Evans, J, Korytowski, W, Boulton, ME, Burke, JM, and Sarna, T, 1995. Blue light-induced reactivity of retinal age pigment. In vitro generation of oxygen-reactive species. J Biol Chem 270, 18825-18830. 

Rittie, L. and Fisher, G. J. (2002). UV-light-induced signal cascades and skin aging. Ageing Res. Rev. 1, 705-720. 

Especially above room temperature many polymers degrade in an air atmosphere by oxidation that is not light-induced (heat ageing). A number of polymers already show a deterioration of the mechanical properties after heating for some days at about 100 °C and even at lower temperatures (e.g. polyethylene, polypropylene, poly(oxy methylene) and poly(ethylene sulphide)). 

With the continuous development of theoretical and computational photochemistry (162,163), also the available quantitative tools for predicting light-induced reactivity are improving rapidly. It is impossible here to cover the immense progress made in this field comprehensively, and therefore, the reader is encoiu-aged to consult and follow the relevant literatiu-e. As a starting point, we can only mention a few topics considered to be of prime interest for bioinorganic photosensitization and photocatalysis. 

---