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photodegradation
(redirected from Photo-degradation)

    Also found in: Wikipedia 0.01 sec.
photodegradation [¦fōd·ō‚deg·rə′dā·shən]
(organic chemistry)
Chemical changes resulting from the absorption of light that reduce the useful properties of materials, particularly polymers. The chemical changes can include bond scission (especially of the molecular backbone), color formation, crosslinking, and chemical rearrangements.
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Photo-degradation of aromatic polyurethanes undergoes two main paths, photolysis and photo-oxidation.
Innovative stabilization packages for thermoplastic polyurethane by Tartarini, Cinzia; Schrinner, Kerstin; Hornbach, K.-H. / Rubber World
Summary: TEHRAN (FNA)- Iranian scientists succeeded in synthesizing a nano-structural semi-conductor which increases the speed of photo-degradation process treating industrial wastes.
Iranian Scientists Accelerate Photo-Degradation of Industrial Wastes by FARS News Agency
The decrease of melting temperature and increase of crystallinity after UV exposure can be easily explained: photodegradation occurs mainly in the amorphous phase, leading to an increase in the surface free energy of the crystals which in turns results in a reduction of melting temperature (13) Also, the chemical reactions that occur during PP photo-degradation lead to chain scissions and carbonyl group formation.
Effect of UV radiation and pro-oxidant on PP biodegradability by Fechine, G.J.M.; Rosa, D.S.; Rezende, M.E.; Demarquette, N.R. / Polymer Engineering and Science
 
 
 
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