A COMPARATIVE ANALYSIS OF ELECTROKINETIC AND DYEING PROPERTIES OF ACRYLIC ACID GRAFTED BAMBOO RAYON

The grafting of acrylic acid (AA) onto bamboo rayon (BR) results in the introduction of carboxylic acid groups onto the fibre, which enhances its cationic dyeability. In the current study, the dye-fibre interaction of grafted bamboo rayon (AA-g-BR) with cationic dyes was studied based on electrokinetic phenomena. The effect of graft add-on (%) on the zeta potential and hence on the hydrophilicity of the fibre was explored. In order to predict the adsorption of the dye and its effect on zeta potential, zeta potential measurements were also carried out in the presence of cationic dye in the streaming solution. The grafted fibres were dyed and then evaluated for colour values and fastness properties. The results obtained clearly demonstrate a good correlation between the zeta potential changes and the dyeability imparted to the fibres, along with their fastness properties. A correlation was also found between the zeta potential of the fibre at various pH values and its dyeability.