[24] 4 Relation entre couleur et constitution chimique [24] : http://forum camille guerin free fr/groupe 20tpe 20ts/I pdf (Généralités sur les colorants)
MIL
In conclusion, the author prepared four novel azo pigments through drastic modification of chemical structures of azo pigments, and investigated their fundamental properties The results indicate that Taylor, DASH User Manual Cambridge
Dye-substrate affinity Dyes containing one or more azo groups (i e azo dyes) comprise by far the largest family of organic dyes Prominent types are 1) acid
mono
Many methods are available for preparing azo compounds, but manufacture of azo dyes is always based on the coupling of dia- zonium compounds with phenols,
substances Les colorants azoïques à base de benzidine et les amines aromatiques désignés Accès : www gazette gc ca/archives/p3/1999/g3-02203 pdf
Azo Technical Background FR
Azo dyes based on benzidine and aromatic amine classified vol 22, no 3 Available from: www gazette gc ca/archives/p3/1999/g3-02203 pdf Canada 2000
Azo Technical Background EN
Azo dyes are prepared in a two step reaction the first being the synthesis of an aromatic diazonium ion from an aniline derivative. The next step is coupling
Structurally they may be considered as being derived from sodium salts of anionic azo dyes containing sulphonate and ? or carboxylate groups by replacement of
The safety of these four azo-dyes has been questioned. The rationale for this review is on the basis that these colorants form carcinogenic amines during
lying the structures synthesis and technical performance of azo pigments
dyes are released into the environment in effluents. More than 800000 tons of dyes are annually produced worldwide
Les colorants azoïques à base de benzidine et les amines aromatiques désignés Accès : www.gazette.gc.ca/archives/p3/1999/g3-02203.pdf. Canada. 2000.
of azo dyes. • Physico-chemical properties toxicity
Originality/value – Lignin-based azo pigment has great potential to replace metal oxide pigment and provide strategy for utilisation of lingo- cellulosic
du textile et des colorants où la prévalence est net- tement plus faible. pements chromophores azo (-N=N-) permettant l'as- ... 156_en.pdf).
19 In general the rate constant of the azo dye decolorization increases until a certain. TiO2 concentration and decreases due to the agglomeration of these.
The Synthesis of Azo Dyes