CATIONISATION OF COTTON ANDSTUDY OFKINETICS AND THERMODYNAMICS PROPERTIES OF ITS DYEING WITH ANIONIC DYE.
CATIONISATION OF COTTON ANDSTUDY OFKINETICS AND THERMODYNAMICS PROPERTIES OF ITS DYEING WITH ANIONIC DYE.
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Date
2014-09
Authors
DANLADI, ABDU ALHAJI
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Abstract
Conventional cotton textiles dyed with direct dyes suffer from the problems of poor exhaustion and moderate to poor washing fastness due to the weak dye-fibre binding forces of hydrogen bonding and Vander Waals attractions. In addition, the dye effluent contains large amounts of dissolved and undissolved electrolytes which are harmful to the aquatic environment. In this work an attempt is made to change the dye-fibre binding force to that of ionic or electrostatic bonding (stronger bond) through cationisation (i.e. imparting positive charge) on the cotton. Cationisation involved the use of CHIPTAC which was converted to its epoxide form called EPTAC which reacted with the fibre to form complexes having two positive heads (dye sites) for formation of ionic bonds with the dye. Cotton cellulose (100%) sliver was purified and cationised prior to dyeing with a direct dye Cupro brilliant blue 2BL (CI Direct Blue158:1). All the dyed samples (cationised and uncationised) were characterised (FTIR), subjected to performance tests (wash and light fastness) as well as kinetics and thermodynamics parameters were studied. Results indicated an improvement in dye exhaustion ranging from 31 to 65% for uncatinised samples (control) to 60 to 85% cationised samples i.e. 51.04% increase. Improvement in wash and light fastness were seen, control samples gave an average rating of 2-3 (colour change) and 3 (staining), cationised samples have 4 (colour change) while 3 to 4 (staining). Light fastness showed percentage increase of 50 to 112.5%. Cationisation resulted in improvement of affinity for the cationised cotton cellulose by the dye ranging from -549.743 to -5253.67 as compared to treated control which showed very low affinity. Activation energy, heat of dyeing, entropy of cationised samples gave more favourable values that enhance dyeing condition than that given by uncatinised samples (control).
Description
A THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF THE DEGREE OF MASTER OF SCIENCE IN COLOUR CHEMISTRY AND TECHNOLOGY.
DEPARTMENT OF TEXTILE SCIENCE AND TECHNOLOGY,
FACULTY OF SCIENCE,
AHMADU BELLO UNIVERSITY, ZARIA.
SEPTEMBER, 2014
Keywords
CATIONISATION,, COTTON,, STUDY,, KINETICS,, THERMODYNAMICS,, PROPERTIES,, DYEING,, ANIONIC,, DYE.