Naslov
Adsorption of Alkyl- and Alkyl-Aryl Sulfonates at Cotton Fibres-Fibre Structure and pH dependent adsorption
(Adsorption of Alkaly- and Alkyl-Aril Sulfonates at Cotton Fibres-Fibre Structure and pH dependent adsorption)

Autori
Soljačić, Ivo ; Grancarić, Ana Marija ; Pušić, Tanja

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Horizonte 2000 / Schwuger, Milan Johan - Jülich : Schriften des Forschungszentrum Julich, 1998

Skup
Horizonte 2000 6.Wolfgang-Ostwald-Kolloquium der Kolloid-Gesellschaft

Mjesto i datum
Jülich, Njemačka, 03.06.1998. - 04.06.1998

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Fibre structure;adsorption;surfactant

Sažetak
In order to study the influence of mercerisation of cotton yarn on its adsorption properties, adsorption experiments were performed to determine the importance of cotton affinity for anionic surfactants in acidic (pH4) and alkaline (pH 9) solutions as well as Ba(OH)2, expressed as Barium Activity Number (BAN), water retention, expressed as Water Retention Value (WRV) and moisture regain (R %). During mercerisation cotton lattice changes from Cellulose I into Cellulose II, what means that the physico-chemical but not chemical changes of cotton cellulose occurs. The effects of these changes are improved cotton lustre, tensile strength, dimensional stability and adsorbability. Because of economy dyeing, one of the most important and well known mercerisation effect is the increasing of dyes adsorption. It increases continuously from untreated cotton to the mercerised with 24% NaOH solution, when it reach a maximum. In general, during the adsorption of anionic particles on cotton surface, ion-ion repulsion occurs and it exhibit a much lesser extent of adsorbed particles, comparing with cationic ones. In the recent paper (1) it was further shown that negative zeta-potential increase with mercerisation degree. In spite of that, the adsorption of anionic dyes on cotton increase by mercerisation, what is not the case with anionic surfactants. It means that different adsorption mechanism occurs during adsorption of surfactants and dyes. One of the sorptive behaviour of the surfactants can be explained on the basis of hydrophilic-hydrophobic balance but it is only one contributing factor in adsorption mechanism. The other factors can be electrokinetic charge, degree of ionisation and the presence of chemically Ba(OH)2 and Water retention as a measure of fibre hydrophility. One of the sorptive behaviour of the surfactants can be explained on the hydrophilic-hydrophobic balance but it is only one contributing factor in adsorption mechanism. The other factors can be electrokinetic charge, degree of ionisation and the presence of chemically reactive groups in the fibre. The cotton yarns studied were scoured, mercerised (with and without tension) and bleached cotton yarns. The anionic surfactants used were sodium dodecylsulphonate and sodium dodecylbenzenesulphonate. The surfactant solutions were determined by modified Epton's method. Barium Activity Number gives the relative number showing the adsorbed Ba(OH)2 on mercerised cotton at equilibrium adsorption in relation to unmercerized one. Water Retention Value (WRV) is the relative amount of water that can not be removed from thoroughly wet fibre mass solely by mechanical means applied as centrifugal force. Thus, the amount of water retained indicate the hydrophility and the degree of cross-linking n cotton cellulose. Moisture regain, as a measure of microstructure order of textiles, is the moisture content at moisture equilibrium using standard atmosphere.

Izvorni jezik
Engleski

Znanstvena područja
Tekstilna tehnologija

POVEZANOST RADA