The thermal cis-trans isomerization of azo dyes XC6H4N=NC6H4N(C2H5)2 (where X is H, OCH3, CN, and NOz) in poly(ethy1ene terephthalate) matrices, below the glass transition temperature, and in dibutylphthalate solutions has been studied kinetically in the temperature range 20-60Β°C. Kinetic behavior i
Effect of poly(ethylene terephthalate) morphology on thermal cis-trans isomerization and photofading of some azo dyes: A kinetic study
β Scribed by Pier Luigi Beltrame; Ernestina Dubini-Paglia; Bruno Marcandalli; Patrizia Sadocco; Alberto Seves
- Book ID
- 118281909
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 547 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0021-8995
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Five polypropylene films were prepared having different crystallinity and morphology, the latter having been modified by stretching. They were colored with azo dyes XC6H4N=N&H4N(C,H5), (where X=H, OCH,, CN, and NO,). The kinetics of the thermal cis-trans isomerization of these dyes has been studied
Azo dyes when irradiated by visible light undergo transcis isomerization, after which the cis form reverts progressively to the thermodynamically more stable trans isomer following a photochemical or thermal path.'-5 For a given dye, the cis-trans isomerization proceeds in different ways depending o