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Carboxyl groups in pre-treated regenerated cellulose fibresFras Zemljič, Lidija ...The influence of peroxide bleaching and slack-mercerization on the amount of acidic groups in regenerated fibres (viscose, modal and lyocell) were studied. Conductometric titration was used to ... determine the total content of acidic carboxylic groups. Polyelectrolyte titration was used for surface and total charge determination, and to obtain information about the charge distribution and accessibilities of charged groups. Changes in fibre crystallinity to pre-treatment processes were characterized using iodine sorption (Schwertassek method) and correlated to treatments and the amount of carboxylic groups. For all three types of fibres the amount of accessible carboxyl groups was lowered by an increase in the degree of crystallinity. Bleaching with hydrogen peroxide causes some oxidative cellulose damage and, therefore, a larger amount of carboxyl groups (presumably formed at the end of cellulose chains). Slack-mercerization did not significantly change the total amount of acidic groups in the fibres, but their accessibility to cationic polyelectrolytes, in particular to polymers with high molecular weight was substantially lowered.Vir: Cellulose. - ISSN 0969-0239 (Vol. 15, no. 5, Oct. 2008, str. 681-690)Vrsta gradiva - e-članekLeto - 2008Jezik - angleškiCOBISS.SI-ID - 12194582
Avtor
Fras Zemljič, Lidija |
Peršin Fratnik, Zdenka |
Stenius, Peer |
Stana-Kleinschek, Karin
Teme
regenerirana vlakna |
celulozna vlakna |
kristaliničnost |
karboksilne skupine |
pred-obdelava |
konduktometrična titracija |
polielektrolitska titracija |
regenerated fibres |
cellulose fibres |
crystallinity |
carboxylic groups |
pre-treatment |
conductometric titration |
polyelectrolyte titration
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Baze podatkov, v katerih je revija indeksirana
Ime baze podatkov | Področje | Leto |
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Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
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Fras Zemljič, Lidija | 19753 |
Peršin Fratnik, Zdenka | 19268 |
Stenius, Peer | |
Stana-Kleinschek, Karin | 07814 |
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