Stable free radicals have been detected in reactive dye/cellulose systems. So far their role has not been clarified. Location of the artificial-light-generated stable free radicals has been detected by electron resonance spectrometry. Photofading was evaluated by determining the colour difference and changes in optical density. Results showed that stable free radicals were detected for all azo reactive dyes. Under the conditions investigated, no free radicals were generated for anthraquinone and phthalocyanine reactive dyes. It was concluded that the source of the free radical generation was the dye molecule. An increase in the rate of fading brought about by light-induced generation of stable free radicals was observed in the presence of the finishing agent dimethylolethyleneurea.
|Pages (from-to)||58-62 + E18-19|
|Publication status||Published - Jan 1 1996|
ASJC Scopus subject areas
- Business and International Management
- Environmental Science(all)
- Industrial and Manufacturing Engineering