Celulozni hidrogelovi

undergraduate thesis

• Title (english): Cellulose hydrogels
• Author: Ivan Antonio Mihalak
• Mentor: Elvira Vidović (mentor)
• Committee member: Elvira Vidović (predsjednik povjerenstva)
• Committee member: Ana Lončarić Božić (član povjerenstva)
• Committee member: Fabio Faraguna (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-09-17, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Chemical Engineering in Material Development

Abstract

U ovom radu istraživala su se svojstva celuloznih hidrogelova dobivenih iz mikrokristalične celuloze. Hidrogelovi su trodimenzionalne polimerne mreže nabubrene s velikom količinom vode, a mogu se pripraviti fizikalnim ili kemijskim umreživanjem. Otapanje mikrokristalične celuloze provedeno je u vodenoj otopini NaOH/urea. Pripremljene su otopine s masenim udjelom celuloze od 1, 3, 5 i 7 mas.%. Metoda umreživanja celuloze bila je fizikalna što znači da se među molekulama celuloze stvaraju intramolekularne vodikove veze. Bilo je potrebno utvrditi koji maseni postotak celuloze u otopini daje optimalnu poroznost celuloznog hidrogela. Poroznost je vrlo bitno svojstvo hidrogelova pošto ona određuje kapacitet kapljevine koju hidrogel može primiti. Priređeni hidrogelovi karakterizirani su infracrvenom spektroskopijom (FTIR), pretražnom elektronskom mikroskopijom (SEM), rendgenskom difrakcijom (XRD) te bubrenjem. Ustanovljeno je da hidrogel dobiven iz 3%-tne otopine celuloze metodom pretaloživanja ima najviši kapacitet bubrenja što se očitava u najvišim vrijednostima stupnja bubrenja.

Abstract (english)

This work investigates properties of cellulose hydrogels made from microcrystalline cellulose. Hydrogels are three-dimensional polymer networks swollen with water which can be synthetized either by chemical or physical crosslinking. Microcrystalline cellulose was disolved in aqueous sloution of NaOH/urea. Solutions with 1, 3, 5 and 7 mass percentages of cellulose were obitained. It was necessary to determine which mass percentage of cellulose in the solution will give the optimal porosity of the cellulose hydrogel. Porosity is a very important feature of hydrogels as it determines the capacity of solvent that the hydrogel can absorb. Prepared hydrogels were characterized by infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and swelling method. It has been found that the hydrogel obtained from 3 mass.% cellulose solution which was prepared by precipitation method has the highest swelling degree.

• Keywords: mikrokristalična celuloza; celulozni hidrogel; NaOH/urea; fizikalno umreživanje
• Keywords (english): microcrystalline cellulose; cellulose hydrogel; NaOH/urea; physical crosslinking
• Language: croatian
• URN:NBN: urn:nbn:hr:149:486385
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-05-17 11:20:41