magistrsko delo
Jasna Tompa (Author), Olivera Šauperl (Mentor), Karin Stana-Kleinschek (Co-mentor), Branko Neral (Co-mentor)

Abstract

Viskozna vlakna spadajo v skupino regeneriranih celuloznih vlaken in predstavljajo zanimiv nosilni substrat za potrebe proti-mikrobnih obdelav. Enaizmed najbolj obetajočih proti-mikrobno delujočih spojin sodobnega časa je hitozan. V tej raziskavi smo viskozo za dosego njene proti-mikrobne učinkovitosti obdelali z hitozanom v kombinaciji z 1,2,3,4 butantetrakarboksilno kislino BTCA, ki predstavlja dober nadomestek za formaldehidne reagente, namenjene obdelavi za izboljšanje mečkavosti materialov iz celuloze. Poudarek raziskovalnega dela je bil usmerjen tudi v izvor temperature obdelave, saj smo predpostavili, da bi sušenje s pomočjo mikrovalov lahko ugodno vplivalo na bolj učinkovito zamreženje viskoze. Učinkovitost zamreženja viskoze smo ovrednotili z različnimi analiznimi metodami. S FT-IR spektroskopijo smo potrdili nastanek estrnih povezav med hidroksilnimi skupinami viskoze in karboksilnimi skupinami BTCA. Učinkovitost zamreženja se odraža tudi na spremembi mehanskih lastnosti, zato smo z merjenjem kota poravnave ter pretržne sile in raztezka proučili morebitno poslabšanje mehanskih lastnosti viskoze po zamreženju. Glede na mehanizem zamreženja je pomemben tudi delež dostopnih karboksilnih skupin BTCA, ki so pozamreženju prisotne v materialu. Zato smo za določanje le teh uporabili klasično indirektno metodo metilensko modro. Kot najpomembnejši kriterij naloge, v smislu protimikrobne učinkovitosti, smo izbrali delež dostopnih aminskih skupin. Tega smo ovrednotili s spektrofotometrično metodo C.I. Acid Orange VII in mikrobiološkim testiranjem. Rezultate smo nato primerjali z rezultati, dobljenimi na osnovi klasičnega načina obdelave po tako imenovanem postopku suhega zamreženja. Na ta način smo ocenili uspešnost obdelav, izpeljanem po enem in drugem postopku.

Keywords

zamreženje;FT-IR spektroskopija;pretržna sila;pretržni raztezek;metilensko modro;kot razgubanja;

Data

Language: Slovenian
Year of publishing:
Source: Maribor
Typology: 2.09 - Master's Thesis
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: [J. Tompa]
UDC: 677.1.027.625.112(043)
COBISS: 15766038 Link will open in a new window
Views: 2800
Downloads: 175
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Other data

Secondary language: English
Secondary title: Functionalization of Viscose Using Chitosan in Combination with 1,2,3,4 Buthanetetracarboxylic Acid (BTCA)
Secondary abstract: Viscose fibers belong to a group of cellulose fibers and are interesting substrate for anti-bacterial treatments. One of the most promising anti-microbial compounds of modern times is chitosan. In this study, viscose was functionalized with chitosan in combination with 1,2,3,4 buthanetetracarboxylic acid (BTCA) with the aim to achieve anti-microbial effectiveness as well as satisfactory resistance against wrinkling. The focus of presented work was directed to the temperature of treatment, because it is assumed that the drying using micro-waves may have a beneficial effect on the viscose functionalization with chitosan in combination with BTCA. The effectiveness of cross-linking was evaluated by various physical chemical methods. With the use of FT-IR spectroscopy the formation of ester linkages between hydroxyl groups of viscose and carboxyl groups of BTCA was confirmed. The effectiveness of crosslinking is reflected also in changes of mechanical properties, so we evaluated the changes in wrinkle recovery angle and in the breaking strength of functionalized viscose fabric, respectively. Considering the mechanism of cross-linking, the amount of accessible carboxyl groups of BTCA is also important. The amount of these groups was calculated on the basisof the Methylene blue method. Antimicrobial activity i.e. the amount of accessible amino groups of functionalized viscose fibres was evaluated on the basis of the Acid Orange VII method data, and with the use of microbiological tests, respectively. The results were mutually compared to find the differencein amino group content as a consequence of the temperature of drying. It is concluded that the source of drying significantly influences theamount of amino groups regarding functionalized regenerated cellulose fabric.
Secondary keywords: crosslinking;FT-IR spectroscopy;breaking strength and elongation;wrinkle recovery angle;methylene blue;
URN: URN:SI:UM:
Type (COBISS): Master's thesis/paper
Thesis comment: Mag. delo, Fakulteta za strojništvo
Pages: VI, 82 f.
Keywords (UDC): applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;various industries;trades and crafts;razne industrije;obrti in rokodelstva;textile industry;tekstilna industrija;bast fibres (fibres from dicotyledon stems);hard fibres (fibres from monocotyledon leaves and fruit);vlakna iz ličja;stebelna vlakna dvokaličnic;trda listna in plodovna vlakna enokaličnic;
ID: 1016291