Abstract
Acrylic fibres are highly crystalline and non-polar polymers, which makes their dyeing a very difficult step that poses real technical challenges. In order to overcome this concern, it is intended in this paper to modify acrylic fibers by different methods namely cationisation using the Crosscolor DRT then amidoximation using hydroxylamine hydrochloride and ammonium acetate. The resulted samples were dyed then with the bio-colorant extracted from grape marc. The effect of the pretreatment on fibers fine structure using X-ray diffraction and the scanning electron microscope (SEM) images and its correlation with the colour strength of the dyed fabrics was investigated. The dyeing parameters, such as dye bath pH and temperature on the performances of this dyeing process were studied. Good dyeing qualities and new shades varying from brown to grey and dark green have been obtained following process optimization, mordanting and modification of acrylic fibers by the technique of cationisation.