ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Photothermal and TiO2- or ZnO-photocatalyzed oxidations of type B- and type K-polyundecanamides (RILSAN) were studied analytically and kinetically. IR spectrophotometry and chemical titration showed that hydroperoxy groups in the polymer reach a fairly high photostationary concentration. Then the primary photoproducts A decompose into products with imido groups (C), the concentration of which are increasing until a photostationary value. Under irradiation, the imides C are converted into acids and amides; in thermooxidation acids are the main products. The intermediate products in photocatalysed oxidation were found to be the same as in photochemical oxidation; a photochemical protection of hydroperoxides and imides was observed, due to the inner filter effect of the absorbing pigments. It could be shown that in polychromatic light the photocatalytic activity of TiO2 (rutile) is more important than its inner filter effect; this antagonism does not depend on the concentration of the photoactive pigment.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1981.021821210
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