Which type of dye forms a covalent link with the substrate?
Correct answer: B. Fibre-reactive dyes
- A. Sulphur dyes
- B. Fibre-reactive dyes
- C. Solvent dyes
- D. Basic dyes
Explanation
Fibre-reactive dyes are unique because they form covalent bonds with the substrate, which is typically cellulose fibers. This covalent bonding occurs during the dyeing process, making the dye part of the fiber structure itself, leading to excellent wash-fastness and colorfastness. On the other hand, sulphur dyes, solvent dyes, and basic dyes do not form covalent bonds. Sulphur dyes rely on oxidation, solvent dyes dissolve in organic solvents, and basic dyes attach via ionic interactions.
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About Industrial Chemistry
Industrial chemistry applies chemical reactions and material properties to the manufacture of adhesives, dyes and polymers. Coverage includes addition and condensation polymerisation, thermoplastics and thermosetting polymers, the structural basis of colour in dyes, and how adhesive composition enables bonding between surfaces.
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