Priprava celuloznih hidrogelova u različitim otapalima

master's thesis

• Title (english): Preparation of cellulose hydrogels in different solvents
• Author: Sofija Kresić
• Mentor: Elvira Vidović (mentor)
• Committee member: Elvira Vidović (predsjednik povjerenstva)
• Committee member: Mirela Leskovac (član povjerenstva)
• Committee member: Marijana Kraljić Roković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-09-22, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Trodimenzionalne umrežene strukture (hidrogelovi) izvedeni iz prirodnih polimera dobivaju sve veću pozornost zbog svoje primjene u području biomaterijala, zbog jedinstvenih prednosti kao što su obilje izvora, netoksičnost, izvrsna biorazgradivost i biokompatibilnost. Celuloza je najrasprostranjeniji polisaharid u prirodi koji se sve više istražuje za pripravu novih vrsta materijala. U ovome radu sintetizirani su hidrogelovi iz polivinilpirolidona ili
poli(N-vinilkaprolaktama) graftiranog na celulozu metodom polimerizacije slobodnih radikala. Hidrogelovi se pripremaju sa ili bez umreživala N,N-metilen-bis-akrilamida. Strukturne karakteristike hidrogelova ispitivane su infracrvenom spektroskopijom s Fourierovim transformacijama. Na uzorcima hidrogelova provedena su ispitivanja površinskih svojstava mjerenjem kontaktnog kuta. Također su provedena reološka ispitivanja te je pretražnom elektronskom mikroskopijom ispitana morfologija. Dobiveni rezultati su pokazali da je veći udio polivinilpirolidona u hidrogelovima koji su se sintetizirali bez umrežavala te da povećanjem udjela N-vinilkaprolaktama u početnoj smjesi raste i relativni udio
poli(N-vinilkaprolaktama) u hidrogelu. Svi hidrogelovi pokazuju viskoelastično ponašanje slično gelu, veliku hidrofilnost, porozni su u nekoj mjeri i imaju hrapavu površinu.

Abstract (english)

Three-dimensional network structures (hydrogels) derived from natural polymers are gaining attention for their application in the field of biomaterials, due to unique advantages such as abundant sources, non-toxicity, excellent biodegradability, and biocompatibility. Cellulose is the most abundant polysaccharide in nature and is increasingly being explored for the preparation of new types of materials. In this study, hydrogels were synthesized from polyvinylpyrrolidone or poly(N-vinylcaprolactam) grafted onto cellulose using the free radical polymerization method. Hydrogels were prepared with or without the crosslinker
N,N-methylene-bis-acrylamide. The structural characteristics of the hydrogels were examined using Fourier-transform infrared spectroscopy. Surface properties of the hydrogel samples were investigated by measuring the contact angle. Rheological studies were also conducted and the morphology was examined by scanning electron microscopy. The results obtained showed higher relative content of polyvinylpyrrolidone in the hydrogels synthesized without a crosslinker, and that an increase in the proportion of N-vinylcaprolactam in the initial mixture resulted in a higher relative content of poly(N-vinylcaprolactam) in the hydrogel. All hydrogels exhibited viscoelastic behavior similar to a gel, high hydrophilicity, some degree of porosity, and a rough surface.

• Keywords: celuloza; hidrogelovi; polivinilpirolidon; poli(N-vinilkaprolaktam)
• Keywords (english): cellulose; hydrogels; polyvinylpyrrolidone; poly(N-vinylcaprolactam)
• Language: croatian
• URN:NBN: urn:nbn:hr:149:290071
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Applied organic chemistry; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra primijenjene kemije (sveučilišni/a magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2023-09-25
• Created on: 2023-11-20 13:59:29