1992
DOI: 10.1002/apmc.1992.051970114
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Investigation of synthesis and light stability of polymeric azo dyes. I. Polymeric urethane‐azo dyes

Abstract: Starting from 10 different 4'-substituted 4-[N,N-dihydroxyethyl]aminoazobenzenes,polymeric urethane-azo dyes (M, 42000-10200) were prepared by reacting those with hexamethylene diisocyanate. The dependence of spectral properties, redox potentials and photofading behaviour on the kind of substituents was determined and then compared with corresponding monomer and dimer model compounds. Photofading is caused by a photooxidative process. In the sequence of monomeric > dimeric > polymeric azo dyes, light stability… Show more

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