Hydrolytic Behavior of Vinylsulfonyl Reactive Dyes - Easiness of Dimerization -
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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.
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.
참고문헌 (16)
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