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Hydrolytic Behavior of Vinylsulfonyl Reactive Dyes - Easiness of Dimerization -

  • Textile Coloration and Finishing
  • Abbr : Text. Color. and Finish.
  • 2015, 27(1), pp.1-10
  • Publisher : The Korean Society Of Dyers And Finishers
  • Research Area : Engineering > Fiber Engineering > Dyeing Engineering

Kim In-Hoe 1

1성균관대학교

Accredited

ABSTRACT

The aim of the current study is to identify the dimerization and decomposition kinetics of the F-DM type. The regeneration of F-VS from FiFj-DM or the reversibility of the dimerizations were investigated. The order of real rateconstants of the dimerization(′ Dij) would seem to be similar to that of rate constants of a dimerization( Dij) for VS dyesat a given pH because of the constancy of the equilibrium constants( aj-value). The reverse reactions of the DM typesare appeared to occur in two steps, the deprotonation of α-carbon of the DM types and disproportionation. The ratio ofthe decomposition of the DM type to F-Hy and F-VS appears to be related with the ratio of i/ j. Similarities werealso found among various other reactions, including homo- and mixed dimerization. VS dyes undergoing fast hydrolysishave difficulty in forming a dimer. The higher the reactivity with cellulose or hydroxide ion, the smaller thedimerization. The easiness of the dimerization was thus found to be inversely proportional to the rate of hydrolysis.

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