چكيده لاتين :
The gray single jersey knitted cotton fabric was bioscoured with pectinase enzyme
and grafted with acrylonitrile monomer by potassium permanganate/citric acid
redox system. The grafted cotton was hydrolyzed with alkali and acetone solvent
in presence of a mild alkali solution separately. FTIR analysis was performed to study
the changes that were imparted by the chemical modification. The absorption peak
observed at 2259 cm-1 corresponds to the stretching vibration of CپكN, which confirms
the grafting. Changes in the surface morphology were observed through the SEM
studies. Because of more swelling nature of the fibres after hydrolysis process by 1.5N
sodium hydroxide the sample image shows slightly bulkier than the other samples.
TGA-DTA thermal analysis shows that the thermal stability was not much affected by
the chemical modification. The solvent induced hydrolysis process shows good results
than the alkali treatments. The grafted cotton shows higher thermal stability than the
bioscoured fabric. The modified fabric shows higher degradation temperature than the
grafted fabric. Dyeing was carried out with different salt concentrations. The acetone
and alkali treated samples show 130% and 20-30% increase in dye uptake than the
grafted and sodium hydroxide alone treated samples. Acetone treatment has brought
some chemical changes to an alkali treated fabric in its structure and increases the
affinity of the modified cotton towards reactive dye.
