photodegradation


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Related to photodegradation: Photocatalysis

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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Structure elucidation of a photodegradation product of ciprofloxacin.
Ngim KK, Mabury SA, Crosby DC (2000) Elucidation of fipronil photodegradation pathways.
A second Willow Ridge additive is PDQ, a proprietary non-starch masterbatch that simultaneously triggers photodegradation and thermal-oxidative breakdown in PE and PP.
While it would seem logical to use lux because it is based upon the human eye's response to light (centered around 520 am), significant photodegradation may result from the shortwave UV region which goes undetected when one uses lux as a measurement device, especially for substrates.
Using isohumulones supplied by brewing companies and a sophisticated technique called time-resolved electron paramagnetic resonance spectroscopy, the UNC scientists and colleagues determined what happens chemically during the photodegradation process.
The fall of HPD absorbance in the Soret peak (around 400 nm) was measured to determine the rate of its photodegradation.
Technique development was discussed briefly, but the lecture stressed applications in the areas of drug photodegradation, the examination of opaque supramolecular systems, and the elucidation of photoinduced imaging.
This research has resulted in the three main methods of breaking down plastic seen today - photodegradation through the addition of photodegradants, biodegradation through the addition of biodegradable additives and biodegradation due to the plastics themselves being inherently degradable materials.
Comparison of dye photodegradation and its coupling with light-to-electricity conversion over TiO2 and ZnO, Langmuir, 1: 591-597.
When it comes to photodegradation, a pigment's structure is only as stable as its weakest link.
It has been reported in the literature that prior photodegradation could be a nice tool to enhance biodegradation of non-biodegradable or even biodegradable polymers.