Ali Akbar Zolriasatein*
Cellulose acetate fabric was bio-treated by lipase enzyme. Afterwards, untreated and bio-treated fabrics were dyed with direct and disperse dyes in conventional methods. Enzymatic deacetylation of cellulose acetate fibers led to an improvement in hydrophilicity. The whiteness index of cellulose acetate fabric slightly decreased from 95.81 to 95.79 after bio-pretreatment. Lipase pre-treatment also caused an increase in fiber diameter up to 54.80%. Bending length decreased from 1.95 to 1.80 cm after enzymatic treatment while number of threads per centimeter and fabric thickness increased. Bio-treated fabric showed lower tensile strength in comparison to untreated fabric almost 52.48%. Change in morphology of fibers was observed by SEM after enzymatic deacetylation. Bio-treated fabric showed an increase in color strength in comparison to untreated fabric. The lipase pretreatment increased the color strength by 19.04 % and 18.50 % for direct and disperse dyes respectively.
Cellulose acetate fabric, Lipase enzyme, Fiber diameter, Bending rigidity, Whiteness index, Color strength
Department of Textile Engineering, College of Technical and Engineering, Yadegar-e-Imam Khomeini (RAH) shahre-rey Branch, Islamic Azad University, Tehran