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Anionic coloration of acrylic fibre. Part 1: Efficient pretreatment and dyeing with acid dyes
Author(s) -
ElShishtawy Reda M,
Ahmed Nahed S E
Publication year - 2005
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2005.tb00264.x
Subject(s) - dyeing , chemistry , ultimate tensile strength , acrylic acid , hydroxylamine , protonation , polymer chemistry , shrinkage , nuclear chemistry , acid dye , ion , organic chemistry , materials science , composite material , polymer , monomer
Anionic dyeable acrylic fibre has been obtained by a viable and efficient pretreatment process using hydroxylamine hydrochloride in the presence of acetate salt. The chemical modification relies on an amidoximation reaction that partially converts cyano groups present in the fibre to amidoxime groups. Different factors that may affect the pretreatment process have been investigated. The pretreated fabrics were dyed with CI Acid Red 1 and CI Acid Green 16 and gave improved dyeability over untreated fabrics due to the ion–ion interactions between the sulphonic groups present in the dye molecules and the protonated amino groups present in the fibres. The treated dyed fabrics also showed excellent fastness properties. Fibre characterisation (nitrogen content, tensile strength, shrinkage, infrared spectra and X‐ray diffraction) proved the success of the amidoximation reaction.