Celulozne nanofibrile kot nosilec taninske kisline v biopolimerni matrici

Kurent, Aljaž (avtor), Poljanšek, Ida (mentor), Oven, Primož (komentor)

Namen diplomske naloge je bil priprava biofilmov na osnovi poli(vinil alkohola) (PVA) z dodatkom funkcionalnih komponent. Kot bioaktivni dodatek smo izbrali taninsko kislino (TA), ki je znana po antibakterijskih in antioksidativnih lastnostih. Za njen nosilec v polimerni matrici smo uporabili tri vrste celuloznih nanofibril (CNF, LCNF, TCNF). Del vzorcev smo dodatno obdelali z ultrazvočnim homogenizatorjem, nato pa iz suspenzij vlili filme v petrijevke. Po večtedenskem sušenju so bili filmi pripravljeni za testiranje, pri čemer smo vse rezultate primerjali z referenčnim PVA filmom. Pri meritvah stičnega kota je imel film z dodatkom 2 % LCNF in 10 % TA (P2LCNF10T) najmanj hidrofilen značaj. Mehanske lastnosti vseh kompozitnih filmov so bile boljše glede na osnovni polimer; najvišje vrednosti modula elastičnosti in natezne trdnosti je dosegel film z dodatkom TCNF in TA (P2TCNF10T) brez ultrazvočne obdelave. Film z dodatkom 2 % CNF in 10 % TA (P2CNF10T) je imel najnižji raztezek pri pretrgu. Film, ki je bil najmanj podvržen izluževanju, je bil biokompozitni film P2TCNF10T.

• Jezik: Slovenski jezik
• Ključne besede: poli(vinil alkohol), celulozne nanofibrile, taninska kislina, biokompozitni filmi
• Vrsta gradiva: Diplomsko delo/naloga
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: BF - Biotehniška fakulteta
• Založnik: [A. Kurent]
• Leto izida: 2025
• PID: 20.500.12556/RUL-173595
• UDK: 630*813.19:676.16
• COBISS.SI-ID: 249615875
• Datum objave v RUL: 19.09.2025

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Cellulose nanofibrils as a tannic acid carrier within a biopolymer matrix

Izvleček

The aim of this thesis was to prepare biofilms based on polyvinyl alcohol (PVA) with the addition of functional components. Tannic acid (TA), known for its antibacterial and antioxidant properties, was selected as the bioactive additive. Three types of cellulose nanofibrils (CNF, LCNF, TCNF) were employed as carriers of TA within the polymer matrix. Part of the samples was additionally treated with an ultrasonic homogenizer, after which the suspensions were cast into Petri dishes to form films. Following several weeks of drying, the films were ready for testing, with all results compared to a reference PVA film. Contact angle measurements revealed that the film containing 2% LCNF and 10% TA (P2LCNF10T) exhibited the lowest degree of hydrophilicity. The mechanical properties of all composite films were improved compared to the neat polymer; the highest values of elastic modulus and tensile strength were obtained for the film containing TCNF and TA (P2TCNF10T) without ultrasonic treatment. The film containing 2% CNF and 10% TA (P2CNF10T) showed the lowest elongation at break. The biocomposite film that was least subjected to leaching was the biocomposite film P2TCNF10T.

• Ključne besede: polyvinyl alcohol, cellulose nanofibrils, tannic acid, biocomposite films