The reaction of sodium cyanate with wool and nylon and its effect on subsequent dyeing

作者：David M. Lewis, Jamie Anthony Hawkes, Lu Yong · 发表于：Coloration Technology · 年份：2013 · DOI：10.1111/cote.12072 · 被引用次数：3 · 研究领域：Dyeing and Modifying Textile Fibers

This paper describes the reaction of the simplest isocyanate, isocyanic acid, conveniently generated in situ from sodium cyanate, with nucleophilic carboxylate and amino residues in polyamide fibres. Changing the pH conditions greatly affects the outcome of these reactions: under acidic conditions the carboxylate residues are selectively carbamoylated, whereas under neutral conditions both residues are carbamoylated. Such modifications greatly change the dyeing behaviour of the treated substrates. The carboxylate carbamoylation reaction leads to the formation of amides rather than the carbamoylcarboxylate, which is a reactive intermediate.