20.500.12556/RUL-175581 Razvoj biokompozitov s ciljnimi lastnostmi na osnovi poli(vinil alkohola), različnih vrst nanoceluloze in taninov Development of biocomposites with target properties based on poly(vinyl alcohol), different types of nanocellulose and tannins Disertacija zajema razvoj in pripravo biokompozitnih filmov na osnovi poli(vinil alkoholne) matrice, ojačane z različnimi vrstami celuloznih nanofibril in taninov. Uporabili smo nemodificirane celulozne nanofibrile, lignocelulozne nanofibrile in TEMPO modificirane celulozne nanofibrile, za pripravo biološko aktivnih kompozitov pa smo v polimerno matrico vključili taninsko kislino, galno kislino, kostanjev tanin in hidrofilni ekstrakt grč bele jelke (Abies Alba Mill.). Pri pripravi biokompozitnih filmov smo variirali delež različnih celuloznih nanofibril kot tudi taninov v poli(vinil alkoholni) matrici in nadalje proučevali kako različen delež in vrsta uporabljenega polnila vplivata na končne lastnosti formuliranih polimernih biokompozitnih filmov. Vse vrste uporabljenih celuloznih nanofibril so primerne za ojačitev poli(vinil alkohola), saj smo pridobili biokompozitne filme z izboljšanimi mehanskimi lastnostmi. S sočasnim dodatkom nemodificiranih celuloznih nanofibril oziroma lignoceluloznih nanofibril ter taninske kisline smo pridobili tri-komponentne biokompozitne filme z izboljšano termično obstojnostjo, višjo temperaturo steklastega prehoda in boljšo odpornostjo proti vodi. Z vključitvijo taninske kisline in hidrofilnega ekstrakta grč bele jelke (Abies Alba Mill.) v polimer smo pripravili biokompozitne filme z antioksidativno aktivnostjo in antibakterijskim delovanjem proti Gram-pozitivnim in Gram-negativnim bakterijam. The dissertation covers the development and preparation of biocomposite films based on a poly(vinyl alcohol) matrix reinforced with different types of cellulose nanofibrils and tannins. Unmodified cellulose nanofibrils, lignocellulosic nanofibrils, and TEMPO-modified cellulose nanofibrils were employed. To obtain biologically active composites, tannic acid, gallic acid, chestnut tannin, and a hydrophilic knotwood extract of silver fir (Abies alba Mill.) were incorporated into the polymer matrix. During the preparation of the biocomposite films, the proportions of the different cellulose nanofibrils and tannins in the poly(vinyl alcohol) matrix were varied, and the influence of the type and content of the fillers on the final properties of the formulated polymer biocomposite films was subsequently investigated. All types of cellulose nanofibrils used were found to be suitable for the reinforcement of poly(vinyl alcohol), as biocomposite films with improved mechanical properties were obtained. Through the simultaneous addition of unmodified cellulose nanofibrils or lignocellulosic nanofibrils together with tannic acid, three-component biocomposite films with enhanced thermal stability, increased glass transition temperature, and improved water resistance were prepared. Incorporation of tannic acid and the hydrophilic knotwood extract of silver fir (Abies alba Mill.) into the polymer led to the formation of biocomposite films exhibiting antioxidant activity and antibacterial performance against both Gram-positive and Gram-negative bacteria. celulozne nanofibrile lignocelulozne nanofibrile TEMPO celulozne nanofibrile poli(vinil alkohol) biokompozitni filmi aktivna embalaža cellulose nanofibrils lignocellulose nanofibrils TEMPO cellulose nanofibrils poly(vinyl alcohol) biocomposite films active packaging true false false [U. Osolnik] Slovenski jezik Angleški jezik Doktorsko delo/naloga 2025-11-05 07:15:54 2025-11-05 07:15:58 2025-12-12 03:53:13 0000-00-00 00:00:00 2025 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*813.6:661.728.7(043.3) 270517 256026627 DR_Osolnik_Ursa_2025.pdf DR_Osolnik_Ursa_2025.pdf 1 5A25281A744685DAC8C6B32B9DAE3824 bb03b6fc4ce664e586974991d34b2f56b739031c2e23b7a5fd9e400ac7e62fc6 9557e570-ba0e-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=221348 Biotehniška fakulteta 0 0 0