Strukturne in sorpcijske lastnosti obdelanih regeneriranih celuloznih vlaken : doktorska disertacija /
Sorpcijske lastnosti regeneriranih celuloznih vlaken so odvisne od strukturnih parametrov in postopkov predobdelave. Predmet raziskav so bila viskozna, modalna in liocel vlakna, ki so bila obdelana z različnimi postopki obdelav (alkalno pranje, beljenje in luženje). Namen dela je bil ugotoviti sprem...
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| Glavni avtor: | |
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| Drugi avtorji: | |
| Format: | Thesis Knjiga |
| Jezik: | Slovenian |
| Izdano: |
Maribor :
[Z. Peršin],
2004.
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| Teme: |
viskozna vlakna
> modalna vlakna
> liocel vlakna
> alkalno pranje
> beljenje
> luženje
> praznine
> sorpcija
> WAXS
> SAXS
> SEC
|
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| Izvleček: | Sorpcijske lastnosti regeneriranih celuloznih vlaken so odvisne od strukturnih parametrov in postopkov predobdelave. Predmet raziskav so bila viskozna, modalna in liocel vlakna, ki so bila obdelana z različnimi postopki obdelav (alkalno pranje, beljenje in luženje). Namen dela je bil ugotoviti spremembe strukturnih parametrov, reaktivnosti in sorpcijskih lastnosti vlaken v odvisnosti od postopkov obdelav. Za preizkušanje so se uporabile sodobne metode, ki na področju vpliva postopkov predobdelav na preiskovana vlakna še niso bile uporabljene. Spremembe v nadmolekulski strukturi vlaken so raziskane s pomočjo rentgenske strukturne analize, vpliv obdelav na sistem praznin pa določen s kolonsko izključitveno kromatografijo. Razlike v strukturi vlaken se odražajo tudi v različni dostopnosti reaktivnih mest v vlaknih, kar je podano s površinsko prosto energijo ter disociacijskimi lastnostmi. Površinska prosta energija se je določila s pomočjo tenziometrije, disociacijske lastnosti pa z vsebnostjo karboksilnih skupin, izmerjenih s kompleksometrično titracijo. Sorpcijske lastnosti vlaken po predobdelavi so bile določene z difuzijo različno velikih molekul reagenta. Stopnja kristaliničnosti se zobdelavami poveča, kar potrjuje tudi JAŠ, ob hkratnem nespremenjenem sistemu praznin. Reaktivne skupine (COOH) korelirajo s kristaliničnostjo in nimajo vpliva na sorpcijsko obnašanje vlaken. Kljub višji stopnji kristaliničnosti in manjšemu številu karboksilnih skupin so vlakna po obdelavi hidrofilnejša in kažejo večje sorpcijske sposobnosti navzemanja velikih in malih molekul re agenta (voda, direktna barvila). Pojav povezujemo s spremembo dostopnosti aktivnih površin v modificirani morfološki zgradbi vlaken. The sorption properties of the regenerated cellulose fibres depend on their structural parameter s and the pre-treatment processes. The research was carried out on viscose, modal and lyocell fibres, which were pre-treated using different processes (alkaline washing, bleaching and slack-mercerisation). The purpose of the research was to determine the changes in the structural and sorption properties, and the reactivity of the regenerated cellulose fibres, due to the used different pre-treatment processes. The investigations were carried out using contemporary methods and procedures which had not yet been us ed in the pre-treatment influence investigations' field. Changes in the supramolecular fibres structure were done using the x-ray analysis and the void system was investigated as a function of different pre-treatment procedures using size exclusion chromatography. The differences in the structural properties are reflected in the different re active groups' accessibility, presented as surface free energy and dissociation properties. The surface free energy was calculated using the tensiometry and the dissociation properties presented as the carboxyl groups' content were appreciated using complexometric titration. The sorption properties, due to the used different pre-treatments, were monitored as diffusion properties using reagents of different molecular size. When using the pre-treatments, the crystallinity degree increases which coincides with the ISV results, but the void system remains unchanged. The reactive groups (-COOH) correlate with crystallinity but they do not have any influence on the sorption fibres' properties. After the pre-treatment was done, despite a higher degree of crystallinity and a small amount of the carboxyl group, the fibres became more hydrophilic and were able to sorb both big and small reagents' moIecules (water, direct dyes). This phenomenon can be explained by changes in the accessiblereactive groups' surface in the modified morphological fibres' structure. |
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| Opis knjige/članka: | Prejemnica nagrade Futurum 2006 za najboljša doktorska dela s področja naravoslovja, tehnike, biotehnike in medicine v obdobju 2003-2006. |
| Fizični opis: | VIII, 187 f. : ilustr. ; 30 cm. |